diff --git a/IMX6ULL/doc_pic/08_Interrupt/16_legacy方式代码的上机实验.md b/IMX6ULL/doc_pic/08_Interrupt/16_legacy方式代码的上机实验.md
index 7d96ea4..e675b7a 100644
--- a/IMX6ULL/doc_pic/08_Interrupt/16_legacy方式代码的上机实验.md
+++ b/IMX6ULL/doc_pic/08_Interrupt/16_legacy方式代码的上机实验.md
@@ -256,7 +256,7 @@ GICD_ISPENDRn有多个寄存器，每个寄存器中每一位对应一个GIC中
 * 编译：
 
   * 在Ubuntu上
-  * 修改`003_virtual_int_controller_legacy`中的Makefile，指定内核路径`KERN_DIR`，在执行`make`命令即可。
+  * 修改`04_virtual_int_controller_legacy_ok`中的Makefile，指定内核路径`KERN_DIR`，在执行`make`命令即可。
 
 * 安装：
 
diff --git a/IMX6ULL/doc_pic/08_Interrupt/18_层级中断控制器驱动程序编写与实验.md b/IMX6ULL/doc_pic/08_Interrupt/18_层级中断控制器驱动程序编写.md
similarity index 89%
rename from IMX6ULL/doc_pic/08_Interrupt/18_层级中断控制器驱动程序编写与实验.md
rename to IMX6ULL/doc_pic/08_Interrupt/18_层级中断控制器驱动程序编写.md
index c4568b9..a922770 100644
--- a/IMX6ULL/doc_pic/08_Interrupt/18_层级中断控制器驱动程序编写与实验.md
+++ b/IMX6ULL/doc_pic/08_Interrupt/18_层级中断控制器驱动程序编写.md
@@ -1,4 +1,4 @@
-## 层级中断控制器驱动程序编写与实验
+## 层级中断控制器驱动程序编写
 
 参考资料：
 
@@ -20,11 +20,11 @@
   ```shell
   doc_and_source_for_drivers\
   	IMX6ULL\source\08_Interrupt\
-  		06_virtual_int_controller_hierarchy_ok
+  		06_virtual_int_controller_hierarchy
 	
   doc_and_source_for_drivers\
   	STM32MP157\source\A7\08_Interrupt\
-  		06_virtual_int_controller_hierarchy_ok
+  		06_virtual_int_controller_hierarchy
   ```
   
   
@@ -124,5 +124,15 @@
 
 会涉及2个驱动程序：虚拟的中断控制器驱动程序，按键驱动程序，以及对应的设备树。
 
+虚拟的中断控制器驱动程序中，涉及2个递归处理。
+
+#### 3.1 alloc的递归处理
+
+![image-20210705120414639](pic/08_Interrupt/083_hierarchy_alloc.png)
 
 
+
+#### 3.2 irq_chip的递归处理
+
+![image-20210705120547553](pic/08_Interrupt/084_hierarchy_irq_chip.png)
+
diff --git a/IMX6ULL/doc_pic/08_Interrupt/18_层级中断控制器驱动程序编写.tif b/IMX6ULL/doc_pic/08_Interrupt/18_层级中断控制器驱动程序编写.tif
new file mode 100644
index 0000000..9f0ce8f
Binary files /dev/null and b/IMX6ULL/doc_pic/08_Interrupt/18_层级中断控制器驱动程序编写.tif differ
diff --git a/IMX6ULL/doc_pic/08_Interrupt/19_层级中断控制器驱动程序上机实验.md b/IMX6ULL/doc_pic/08_Interrupt/19_层级中断控制器驱动程序上机实验.md
new file mode 100644
index 0000000..6e059ed
--- /dev/null
+++ b/IMX6ULL/doc_pic/08_Interrupt/19_层级中断控制器驱动程序上机实验.md
@@ -0,0 +1,299 @@
+## 层级中断控制器驱动程序上机实验
+
+参考资料：
+
+* [linux kernel的中断子系统之（七）：GIC代码分析](http://www.wowotech.net/irq_subsystem/gic_driver.html)
+
+* Linux 4.9.88内核源码
+
+  * `Linux-4.9.88\drivers\gpio\gpio-mxc.c`
+  * `Linux-4.9.88\arch\arm\boot\dts\imx6ull.dtsi`
+
+* Linux 5.4内核源码
+  
+  * `Linux-5.4\drivers\pinctrl\stm32\pinctrl-stm32mp157.c`
+  * `Linux-5.4\drivers\irqchip\irq-stm32-exti.c`
+  * `Linux-5.4\arch\arm\boot\dts\stm32mp151.dtsi`
+  
+* 芯片手册
+
+  * IMX6ULL: imx6ullrm.pdf
+  * STM32MP157: DM00327659.pdf
+  
+* 本节视频源码在GIT仓库里
+
+  ```shell
+  doc_and_source_for_drivers\
+  	IMX6ULL\source\08_Interrupt\
+  		07_virtual_int_controller_hierarchy_ok
+			
+  doc_and_source_for_drivers\
+  	STM32MP157\source\A7\08_Interrupt\
+  		07_virtual_int_controller_hierarchy_ok
+  ```
+  
+  
+
+### 1. 确定中断号n
+
+![](pic/08_Interrupt/076_virtual_intc_hardware.png)
+
+查看芯片手册，选择一个保留的、未使用的GIC SPI中断即可。
+
+#### 1.1 IMX6ULL
+
+看芯片手册第3章：
+
+![image-20210704072332512](pic/08_Interrupt/077_imx6ll_reserved_gic_int.png)
+
+看上图，选择122号中断，它是SPI里的122号中断，GIC里的编号是(32+122)=154。
+
+
+
+#### 1.2 STM32MP157
+
+看芯片手册第21.2节：
+
+![image-20210704072802087](pic/08_Interrupt/078_stm32mp157_reserved_gic_int.png)
+
+看上图，选择210号中断，它是SPI里的210号中断，GIC里的编号是(32+210)=242。
+
+### 2. 怎么触发中断
+
+可以通过devmem命令直接写GIC的PENDING寄存区。
+
+![image-20210704073305082](pic/08_Interrupt/079_GICD_ISPENDRn.png)
+
+GICD_ISPENDRn有多个寄存器，每个寄存器中每一位对应一个GIC中断，写入1就可以触发该中断。
+
+写哪一个GICD_ISPENDRn寄存器？写哪一位？使用下列公式来确定：
+
+![image-20210704073518013](pic/08_Interrupt/080_GICD_ISPENDRn_calc.png)
+
+查看内核设备树文件imx6ull.dtsi、stm32mp151.dtsi，可以知道：
+
+* IMX6ULL的GIC Distributor 地址是：0x00a01000
+  ![image-20210704103943340](pic/08_Interrupt/082_imx6ull_gic_dts.png)
+* STM32MP157的GIC Distributor 地址是：0xa0021000
+  ![image-20210704074850302](pic/08_Interrupt/081_stm32mp157_gic_dts.png)
+
+| 芯片       | SPI中断号 | GIC中断号 | n,bit | GICD_ISPENDRn地址 | 命令                          |
+| ---------- | --------- | --------- | ----- | ----------------- | ----------------------------- |
+| IMX6LLL    | 122       | 154       | 4,26  | 0xa01210          | devmem 0xa01210 32 0x4000000  |
+|            | 123       | 155       | 4,27  | 0xa01210          | devmem 0xa01210 32 0x8000000  |
+|            | 124       | 156       | 4,28  | 0xa01210          | devmem 0xa01210 32 0x10000000 |
+|            | 125       | 157       | 4,29  | 0xa01210          | devmem 0xa01210 32 0x20000000 |
+| STM32MP157 | 210       | 242       | 7,18  | 0xa002121c        | devmem 0xa002121c 32 0x40000  |
+|            | 211       | 243       | 7,19  | 0xa002121c        | devmem 0xa002121c 32 0x80000  |
+|            | 212       | 244       | 7,20  | 0xa002121c        | devmem 0xa002121c 32 0x100000 |
+|            | 213       | 245       | 7,21  | 0xa002121c        | devmem 0xa002121c 32 0x200000 |
+
+
+
+### 3. 上机实验
+
+#### 3.1 设置工具链
+
+##### 1. STM32MP157
+
+  ```shell
+  export ARCH=arm
+  export CROSS_COMPILE=arm-buildroot-linux-gnueabihf-
+  export PATH=$PATH:/home/book/100ask_stm32mp157_pro-sdk/ToolChain/arm-buildroot-linux-gnueabihf_sdk-buildroot/bin
+  ```
+
+##### 2. IMX6ULL
+
+  ```shell
+  export ARCH=arm
+  export CROSS_COMPILE=arm-linux-gnueabihf-
+  export PATH=$PATH:/home/book/100ask_imx6ull-sdk/ToolChain/gcc-linaro-6.2.1-2016.11-x86_64_arm-linux-gnueabihf/bin
+  ```
+
+
+
+#### 3.2 编译、替换设备树
+
+##### 1. STM32MP157
+
+  * 修改`arch/arm/boot/dts/stm32mp157c-100ask-512d-lcd-v1.dts`，添加如下代码：
+
+    ```shell
+    / {
+       virtual_intc: virtual_intc_100ask {
+            compatible = "100ask,virtual_intc";
+    
+            interrupt-controller;
+            #interrupt-cells = <2>;
+    
+            interrupt-parent = <&intc>;
+            //upper_hwirq_base = <122>;  // imx6ull
+            upper_hwirq_base = <210>;  // stm32mp157
+        };
+    
+        gpio_keys_100ask {
+            compatible = "100ask,gpio_key";
+            interrupt-parent = <&virtual_intc>;
+            interrupts = <0 IRQ_TYPE_LEVEL_HIGH>,
+                         <1 IRQ_TYPE_LEVEL_HIGH>,
+                         <2 IRQ_TYPE_LEVEL_HIGH>,
+                         <3 IRQ_TYPE_LEVEL_HIGH>;
+        };
+    };
+    ```
+
+    
+
+  * 编译设备树：
+    在Ubuntu的STM32MP157内核目录下执行如下命令,
+    得到设备树文件：`arch/arm/boot/dts/stm32mp157c-100ask-512d-lcd-v1.dtb`
+
+    ```shell
+    make dtbs
+    ```
+
+  * 复制到NFS目录：
+
+    ```shell
+    $ cp arch/arm/boot/dts/stm32mp157c-100ask-512d-lcd-v1.dtb ~/nfs_rootfs/
+    ```
+
+  * 开发板上挂载NFS文件系统
+
+    * vmware使用NAT(假设windowsIP为192.168.1.100)
+
+      ```shell
+      [root@100ask:~]# mount -t nfs -o nolock,vers=3,port=2049,mountport=9999 
+      192.168.1.100:/home/book/nfs_rootfs /mnt
+      ```
+
+    * vmware使用桥接，或者不使用vmware而是直接使用服务器：假设Ubuntu IP为192.168.1.137
+
+      ```shell
+      [root@100ask:~]#  mount -t nfs -o nolock,vers=3 192.168.1.137:/home/book/nfs_rootfs /mnt
+      ```
+
+* 更新设备树
+
+  ```shell
+  [root@100ask:~]# mount  /dev/mmcblk2p2  /boot
+  [root@100ask:~]# cp /mnt/stm32mp157c-100ask-512d-lcd-v1.dtb /boot
+  [root@100ask:~]# sync
+  ```
+
+* 重启开发板
+
+  
+
+
+
+##### 2. IMX6ULL
+
+  * 修改`arch/arm/boot/dts/100ask_imx6ull-14x14.dts`，添加如下代码：
+
+    ```shell
+    / {
+       virtual_intc: virtual_intc_100ask {
+            compatible = "100ask,virtual_intc";
+    
+            interrupt-controller;
+            #interrupt-cells = <2>;
+    
+            interrupt-parent = <&intc>;
+            upper_hwirq_base = <122>;  // imx6ull
+            //upper_hwirq_base = <210>;  // stm32mp157
+        };
+    
+        gpio_keys_100ask {
+            compatible = "100ask,gpio_key";
+            interrupt-parent = <&virtual_intc>;
+            interrupts = <0 IRQ_TYPE_LEVEL_HIGH>,
+                         <1 IRQ_TYPE_LEVEL_HIGH>,
+                         <2 IRQ_TYPE_LEVEL_HIGH>,
+                         <3 IRQ_TYPE_LEVEL_HIGH>;
+        };
+    
+    };
+    ```
+
+    
+
+  * 编译设备树：
+    在Ubuntu的IMX6ULL内核目录下执行如下命令,
+    得到设备树文件：`arch/arm/boot/dts/100ask_imx6ull-14x14.dtb`
+
+    ```shell
+    make dtbs
+    ```
+
+  * 复制到NFS目录：
+
+    ```shell
+    $ cp arch/arm/boot/dts/100ask_imx6ull-14x14.dtb ~/nfs_rootfs/
+    ```
+
+* 开发板上挂载NFS文件系统
+
+  * vmware使用NAT(假设windowsIP为192.168.1.100)
+
+    ```shell
+    [root@100ask:~]# mount -t nfs -o nolock,vers=3,port=2049,mountport=9999 
+    192.168.1.100:/home/book/nfs_rootfs /mnt
+    ```
+
+  * vmware使用桥接，或者不使用vmware而是直接使用服务器：假设Ubuntu IP为192.168.1.137
+
+    ```shell
+    [root@100ask:~]#  mount -t nfs -o nolock,vers=3 192.168.1.137:/home/book/nfs_rootfs /mnt
+    ```
+
+  * 更新设备树
+
+    ```shell
+    [root@100ask:~]# cp /mnt/100ask_imx6ull-14x14.dtb /boot
+    [root@100ask:~]# sync
+    ```
+
+* 重启开发板
+
+
+
+#### 3.3 编译、安装驱动程序
+
+* 编译：
+
+  * 在Ubuntu上
+  * 修改`07_virtual_int_controller_hierarchy_ok`中的Makefile，指定内核路径`KERN_DIR`，在执行`make`命令即可。
+
+* 安装：
+
+  * 在开发板上
+
+  * 挂载NFS，复制文件，insmod，类似如下命令：
+
+    ```shell
+    mount -t nfs -o nolock,vers=3 192.168.1.137:/home/book/nfs_rootfs /mnt
+    // 对于IMX6ULL，想看到驱动打印信息，需要先执行
+    echo "7 4 1 7" > /proc/sys/kernel/printk
+    
+    insmod -f /mnt/virtual_int_controller.ko
+    // 安装virtual_int_controller之后即可进入/sys/kernel/irq目录查看分配的中断号
+    
+    insmod -f /mnt/gpio_key_drv.ko
+    cat /proc/interrupts
+    
+    // 触发中断
+    // 对于IMX6ULL
+    devmem 0xa01210 32 0x4000000
+    devmem 0xa01210 32 0x8000000
+    devmem 0xa01210 32 0x10000000
+    devmem 0xa01210 32 0x20000000
+    
+    // 对于stm32mp157
+    devmem 0xa002121c 32 0x40000 
+    devmem 0xa002121c 32 0x80000
+    devmem 0xa002121c 32 0x100000  // 它不能触发中断,可能是被占用了
+    devmem 0xa002121c 32 0x200000
+    ```
+
+* 观察内核打印的信息
diff --git a/IMX6ULL/doc_pic/08_Interrupt/pic/08_Interrupt/083_hierarchy_alloc.png b/IMX6ULL/doc_pic/08_Interrupt/pic/08_Interrupt/083_hierarchy_alloc.png
new file mode 100644
index 0000000..ce08f3a
Binary files /dev/null and b/IMX6ULL/doc_pic/08_Interrupt/pic/08_Interrupt/083_hierarchy_alloc.png differ
diff --git a/IMX6ULL/doc_pic/08_Interrupt/pic/08_Interrupt/084_hierarchy_irq_chip.png b/IMX6ULL/doc_pic/08_Interrupt/pic/08_Interrupt/084_hierarchy_irq_chip.png
new file mode 100644
index 0000000..1641ea6
Binary files /dev/null and b/IMX6ULL/doc_pic/08_Interrupt/pic/08_Interrupt/084_hierarchy_irq_chip.png differ
diff --git a/IMX6ULL/source/08_Interrupt/06_virtual_int_controller_hierarchy/Makefile b/IMX6ULL/source/08_Interrupt/06_virtual_int_controller_hierarchy/Makefile
new file mode 100644
index 0000000..588910a
--- /dev/null
+++ b/IMX6ULL/source/08_Interrupt/06_virtual_int_controller_hierarchy/Makefile
@@ -0,0 +1,21 @@
+
+# 1. 使用不同的开发板内核时, 一定要修改KERN_DIR
+# 2. KERN_DIR中的内核要事先配置、编译, 为了能编译内核, 要先设置下列环境变量:
+# 2.1 ARCH,          比如: export ARCH=arm64
+# 2.2 CROSS_COMPILE, 比如: export CROSS_COMPILE=aarch64-linux-gnu-
+# 2.3 PATH,          比如: export PATH=$PATH:/home/book/100ask_roc-rk3399-pc/ToolChain-6.3.1/gcc-linaro-6.3.1-2017.05-x86_64_aarch64-linux-gnu/bin 
+# 注意: 不同的开发板不同的编译器上述3个环境变量不一定相同,
+#       请参考各开发板的高级用户使用手册
+
+KERN_DIR = /home/book/100ask_imx6ull-sdk/Linux-4.9.88
+
+all:
+	make -C $(KERN_DIR) M=`pwd` modules 
+
+clean:
+	make -C $(KERN_DIR) M=`pwd` modules clean
+	rm -rf modules.order
+
+obj-m	+= virtual_int_controller.o
+obj-m   += gpio_key_drv.o
+
diff --git a/IMX6ULL/source/08_Interrupt/06_virtual_int_controller_hierarchy/gpio_key_drv.c b/IMX6ULL/source/08_Interrupt/06_virtual_int_controller_hierarchy/gpio_key_drv.c
new file mode 100644
index 0000000..dfd7d26
--- /dev/null
+++ b/IMX6ULL/source/08_Interrupt/06_virtual_int_controller_hierarchy/gpio_key_drv.c
@@ -0,0 +1,125 @@
+#include <linux/module.h>
+
+#include <linux/fs.h>
+#include <linux/errno.h>
+#include <linux/miscdevice.h>
+#include <linux/kernel.h>
+#include <linux/major.h>
+#include <linux/mutex.h>
+#include <linux/proc_fs.h>
+#include <linux/seq_file.h>
+#include <linux/stat.h>
+#include <linux/init.h>
+#include <linux/device.h>
+#include <linux/tty.h>
+#include <linux/kmod.h>
+#include <linux/gfp.h>
+#include <linux/gpio/consumer.h>
+#include <linux/platform_device.h>
+#include <linux/of_gpio.h>
+#include <linux/of_irq.h>
+#include <linux/interrupt.h>
+#include <linux/irq.h>
+#include <linux/slab.h>
+
+
+struct gpio_key{
+	char name[100];
+	int irq;
+	int cnt;
+} ;
+
+static struct gpio_key gpio_keys_100ask[100];
+
+static irqreturn_t gpio_key_isr(int irq, void *dev_id)
+{
+	struct gpio_key *gpio_key = dev_id;
+	
+
+	printk("gpio_key_isr %s cnt %d\n", gpio_key->name, gpio_key->cnt++);
+	
+	return IRQ_HANDLED;
+}
+
+/* 1. 从platform_device获得GPIO
+ * 2. gpio=>irq
+ * 3. request_irq
+ */
+static int gpio_key_probe(struct platform_device *pdev)
+{
+	int err;
+	int i = 0;
+	int irq;
+		
+	printk("%s %s line %d\n", __FILE__, __FUNCTION__, __LINE__);
+
+
+	while (1)
+	{
+		irq = platform_get_irq(pdev, i);
+		if (irq <= 0)
+			break;
+		gpio_keys_100ask[i].irq = irq;
+		sprintf(gpio_keys_100ask[i].name, "100as_virtual_key%d", i);
+		
+		err = devm_request_irq(&pdev->dev, gpio_keys_100ask[i].irq, gpio_key_isr, IRQF_TRIGGER_RISING | IRQF_TRIGGER_FALLING, gpio_keys_100ask[i].name, &gpio_keys_100ask[i]);
+		printk("devm_request_irq %d for %s, err = %d\n", irq, gpio_keys_100ask[i].name, err);
+		i++;
+	}
+        
+    return 0;
+    
+}
+
+static int gpio_key_remove(struct platform_device *pdev)
+{
+    return 0;
+}
+
+
+static const struct of_device_id ask100_keys[] = {
+    { .compatible = "100ask,gpio_key" },
+    { },
+};
+
+/* 1. 定义platform_driver */
+static struct platform_driver gpio_keys_driver = {
+    .probe      = gpio_key_probe,
+    .remove     = gpio_key_remove,
+    .driver     = {
+        .name   = "100ask_gpio_key",
+        .of_match_table = ask100_keys,
+    },
+};
+
+/* 2. 在入口函数注册platform_driver */
+static int __init gpio_key_init(void)
+{
+    int err;
+    
+	printk("%s %s line %d\n", __FILE__, __FUNCTION__, __LINE__);
+	
+    err = platform_driver_register(&gpio_keys_driver); 
+	
+	return err;
+}
+
+/* 3. 有入口函数就应该有出口函数：卸载驱动程序时，就会去调用这个出口函数
+ *     卸载platform_driver
+ */
+static void __exit gpio_key_exit(void)
+{
+	printk("%s %s line %d\n", __FILE__, __FUNCTION__, __LINE__);
+
+    platform_driver_unregister(&gpio_keys_driver);
+}
+
+
+/* 7. 其他完善：提供设备信息，自动创建设备节点                                     */
+
+module_init(gpio_key_init);
+module_exit(gpio_key_exit);
+
+MODULE_LICENSE("GPL");
+
+
diff --git a/IMX6ULL/source/08_Interrupt/06_virtual_int_controller_hierarchy/virtual_int_controller.c b/IMX6ULL/source/08_Interrupt/06_virtual_int_controller_hierarchy/virtual_int_controller.c
new file mode 100644
index 0000000..fe078a4
--- /dev/null
+++ b/IMX6ULL/source/08_Interrupt/06_virtual_int_controller_hierarchy/virtual_int_controller.c
@@ -0,0 +1,163 @@
+#include <linux/kernel.h>
+#include <linux/module.h>
+#include <linux/clk.h>
+#include <linux/err.h>
+#include <linux/init.h>
+#include <linux/interrupt.h>
+#include <linux/io.h>
+#include <linux/random.h>
+#include <linux/irq.h>
+#include <linux/irqdomain.h>
+#include <linux/irqchip/chained_irq.h>
+#include <linux/platform_device.h>
+#include <linux/pm_runtime.h>
+#include <linux/slab.h>
+#include <linux/gpio/driver.h>
+/* FIXME: for gpio_get_value() replace this with direct register read */
+#include <linux/gpio.h>
+#include <linux/of.h>
+#include <linux/of_device.h>
+#include <linux/bug.h>
+
+
+static struct irq_domain *virtual_intc_domain;
+static u32 upper_hwirq_base;
+
+static int virtual_intc_domain_translate(struct irq_domain *d,
+				    struct irq_fwspec *fwspec,
+				    unsigned long *hwirq,
+				    unsigned int *type)
+{
+	if (is_of_node(fwspec->fwnode)) {
+		if (fwspec->param_count != 2)
+			return -EINVAL;
+
+		*hwirq = fwspec->param[0];
+		*type = fwspec->param[1];
+		return 0;
+	}
+
+	return -EINVAL;
+}
+
+static void virtual_intc_irq_unmask(struct irq_data *d)
+{
+	printk("%s %s %d\n", __FILE__, __FUNCTION__, __LINE__);
+	irq_chip_unmask_parent(d);
+}
+
+static void virtual_intc_irq_mask(struct irq_data *d)
+{
+	printk("%s %s %d\n", __FILE__, __FUNCTION__, __LINE__);
+	irq_chip_mask_parent(d);
+}
+
+static struct irq_chip virtual_intc_chip = {
+	.name			= "virtual_intc",
+	.irq_mask		= virtual_intc_irq_mask,
+	.irq_unmask 	= virtual_intc_irq_unmask,
+};
+
+
+static int virtual_intc_domain_alloc(struct irq_domain *domain,
+				  unsigned int irq,
+				  unsigned int nr_irqs, void *data)
+{
+	struct irq_fwspec *fwspec = data;
+	struct irq_fwspec parent_fwspec;
+	irq_hw_number_t hwirq;
+	int i;
+	
+	/* 设置irq_desc[irq] */
+
+	/* 1. 设置irq_desc[irq].irq_data, 里面含有virtual_intc irq_chip */
+	hwirq = fwspec->param[0];
+	for (i = 0; i < nr_irqs; i++)
+		irq_domain_set_hwirq_and_chip(domain, irq + i, hwirq + i,
+					      &virtual_intc_chip, NULL);
+
+	/* 2. 设置irq_desc[irq].handle_irq,  来自GIC */
+	parent_fwspec.fwnode = domain->parent->fwnode;
+	parent_fwspec.param_count = 3;
+	parent_fwspec.param[0]    = GIC_SPI;
+	parent_fwspec.param[1]    = fwspec->param[0] + upper_hwirq_base;
+	parent_fwspec.param[2]    = fwspec->param[1];
+	
+	return irq_domain_alloc_irqs_parent(domain, irq, nr_irqs,
+					  &parent_fwspec);
+}
+
+static const struct irq_domain_ops virtual_intc_domain_ops = {
+	.translate	= virtual_intc_domain_translate,
+	.alloc		= virtual_intc_domain_alloc,
+};
+
+static int virtual_intc_probe(struct platform_device *pdev)
+{	
+
+	struct irq_domain *parent_domain;
+	struct device_node *parent;
+	int err;
+		
+
+	printk("%s %s %d\n", __FILE__, __FUNCTION__, __LINE__);
+	err = of_property_read_u32(pdev->dev.of_node, "upper_hwirq_base", &upper_hwirq_base);
+
+	parent = of_irq_find_parent(pdev->dev.of_node);
+	parent_domain = irq_find_host(parent);
+
+
+	/* 分配/设置/注册irq_domain */
+	virtual_intc_domain = irq_domain_add_hierarchy(parent_domain, 0, 4,
+					  pdev->dev.of_node, &virtual_intc_domain_ops,
+					  NULL);
+	
+	
+	return 0;
+}
+static int virtual_intc_remove(struct platform_device *pdev)
+{
+	printk("%s %s %d\n", __FILE__, __FUNCTION__, __LINE__);
+	return 0;
+}
+
+
+static const struct of_device_id virtual_intc_of_match[] = {
+	{ .compatible = "100ask,virtual_intc", },
+	{ },
+};
+
+
+static struct platform_driver virtual_intc_driver = {
+	.probe		= virtual_intc_probe,
+	.remove		= virtual_intc_remove,
+	.driver		= {
+		.name	= "100ask_virtual_intc",
+		.of_match_table = of_match_ptr(virtual_intc_of_match),
+	}
+};
+
+
+/* 1. 入口函数 */
+static int __init virtual_intc_init(void)
+{	
+	printk("%s %s %d\n", __FILE__, __FUNCTION__, __LINE__);
+	/* 1.1 注册一个platform_driver */
+	return platform_driver_register(&virtual_intc_driver);
+}
+
+
+/* 2. 出口函数 */
+static void __exit virtual_intc_exit(void)
+{
+	printk("%s %s %d\n", __FILE__, __FUNCTION__, __LINE__);
+	/* 2.1 反注册platform_driver */
+	platform_driver_unregister(&virtual_intc_driver);
+}
+
+module_init(virtual_intc_init);
+module_exit(virtual_intc_exit);
+
+MODULE_LICENSE("GPL");
+
+
diff --git a/IMX6ULL/source/08_Interrupt/06_virtual_int_controller_hierarchy/virtual_intc.dts b/IMX6ULL/source/08_Interrupt/06_virtual_int_controller_hierarchy/virtual_intc.dts
new file mode 100644
index 0000000..e99d176
--- /dev/null
+++ b/IMX6ULL/source/08_Interrupt/06_virtual_int_controller_hierarchy/virtual_intc.dts
@@ -0,0 +1,24 @@
+
+#define m 123
+
+/{
+   virtual_intc: virtual_intc_100ask {
+        compatible = "100ask,virtual_intc";
+
+        interrupt-controller;
+        #interrupt-cells = <2>;
+
+        interrupt-parent = <&intc>;
+		upper_hwirq_base = <m>;
+    };
+
+    gpio_keys_100ask {
+        compatible = "100ask,gpio_key";
+        interrupt-parent = <&virtual_intc>;
+        interrupts = <0 IRQ_TYPE_LEVEL_HIGH>,
+                     <1 IRQ_TYPE_LEVEL_HIGH>,
+                     <2 IRQ_TYPE_LEVEL_HIGH>,
+                     <3 IRQ_TYPE_LEVEL_HIGH>;
+    };
+    
+};
diff --git a/IMX6ULL/source/08_Interrupt/07_virtual_int_controller_hierarchy_ok/Makefile b/IMX6ULL/source/08_Interrupt/07_virtual_int_controller_hierarchy_ok/Makefile
new file mode 100644
index 0000000..588910a
--- /dev/null
+++ b/IMX6ULL/source/08_Interrupt/07_virtual_int_controller_hierarchy_ok/Makefile
@@ -0,0 +1,21 @@
+
+# 1. 使用不同的开发板内核时, 一定要修改KERN_DIR
+# 2. KERN_DIR中的内核要事先配置、编译, 为了能编译内核, 要先设置下列环境变量:
+# 2.1 ARCH,          比如: export ARCH=arm64
+# 2.2 CROSS_COMPILE, 比如: export CROSS_COMPILE=aarch64-linux-gnu-
+# 2.3 PATH,          比如: export PATH=$PATH:/home/book/100ask_roc-rk3399-pc/ToolChain-6.3.1/gcc-linaro-6.3.1-2017.05-x86_64_aarch64-linux-gnu/bin 
+# 注意: 不同的开发板不同的编译器上述3个环境变量不一定相同,
+#       请参考各开发板的高级用户使用手册
+
+KERN_DIR = /home/book/100ask_imx6ull-sdk/Linux-4.9.88
+
+all:
+	make -C $(KERN_DIR) M=`pwd` modules 
+
+clean:
+	make -C $(KERN_DIR) M=`pwd` modules clean
+	rm -rf modules.order
+
+obj-m	+= virtual_int_controller.o
+obj-m   += gpio_key_drv.o
+
diff --git a/IMX6ULL/source/08_Interrupt/07_virtual_int_controller_hierarchy_ok/gpio_key_drv.c b/IMX6ULL/source/08_Interrupt/07_virtual_int_controller_hierarchy_ok/gpio_key_drv.c
new file mode 100644
index 0000000..dfd7d26
--- /dev/null
+++ b/IMX6ULL/source/08_Interrupt/07_virtual_int_controller_hierarchy_ok/gpio_key_drv.c
@@ -0,0 +1,125 @@
+#include <linux/module.h>
+
+#include <linux/fs.h>
+#include <linux/errno.h>
+#include <linux/miscdevice.h>
+#include <linux/kernel.h>
+#include <linux/major.h>
+#include <linux/mutex.h>
+#include <linux/proc_fs.h>
+#include <linux/seq_file.h>
+#include <linux/stat.h>
+#include <linux/init.h>
+#include <linux/device.h>
+#include <linux/tty.h>
+#include <linux/kmod.h>
+#include <linux/gfp.h>
+#include <linux/gpio/consumer.h>
+#include <linux/platform_device.h>
+#include <linux/of_gpio.h>
+#include <linux/of_irq.h>
+#include <linux/interrupt.h>
+#include <linux/irq.h>
+#include <linux/slab.h>
+
+
+struct gpio_key{
+	char name[100];
+	int irq;
+	int cnt;
+} ;
+
+static struct gpio_key gpio_keys_100ask[100];
+
+static irqreturn_t gpio_key_isr(int irq, void *dev_id)
+{
+	struct gpio_key *gpio_key = dev_id;
+	
+
+	printk("gpio_key_isr %s cnt %d\n", gpio_key->name, gpio_key->cnt++);
+	
+	return IRQ_HANDLED;
+}
+
+/* 1. 从platform_device获得GPIO
+ * 2. gpio=>irq
+ * 3. request_irq
+ */
+static int gpio_key_probe(struct platform_device *pdev)
+{
+	int err;
+	int i = 0;
+	int irq;
+		
+	printk("%s %s line %d\n", __FILE__, __FUNCTION__, __LINE__);
+
+
+	while (1)
+	{
+		irq = platform_get_irq(pdev, i);
+		if (irq <= 0)
+			break;
+		gpio_keys_100ask[i].irq = irq;
+		sprintf(gpio_keys_100ask[i].name, "100as_virtual_key%d", i);
+		
+		err = devm_request_irq(&pdev->dev, gpio_keys_100ask[i].irq, gpio_key_isr, IRQF_TRIGGER_RISING | IRQF_TRIGGER_FALLING, gpio_keys_100ask[i].name, &gpio_keys_100ask[i]);
+		printk("devm_request_irq %d for %s, err = %d\n", irq, gpio_keys_100ask[i].name, err);
+		i++;
+	}
+        
+    return 0;
+    
+}
+
+static int gpio_key_remove(struct platform_device *pdev)
+{
+    return 0;
+}
+
+
+static const struct of_device_id ask100_keys[] = {
+    { .compatible = "100ask,gpio_key" },
+    { },
+};
+
+/* 1. 定义platform_driver */
+static struct platform_driver gpio_keys_driver = {
+    .probe      = gpio_key_probe,
+    .remove     = gpio_key_remove,
+    .driver     = {
+        .name   = "100ask_gpio_key",
+        .of_match_table = ask100_keys,
+    },
+};
+
+/* 2. 在入口函数注册platform_driver */
+static int __init gpio_key_init(void)
+{
+    int err;
+    
+	printk("%s %s line %d\n", __FILE__, __FUNCTION__, __LINE__);
+	
+    err = platform_driver_register(&gpio_keys_driver); 
+	
+	return err;
+}
+
+/* 3. 有入口函数就应该有出口函数：卸载驱动程序时，就会去调用这个出口函数
+ *     卸载platform_driver
+ */
+static void __exit gpio_key_exit(void)
+{
+	printk("%s %s line %d\n", __FILE__, __FUNCTION__, __LINE__);
+
+    platform_driver_unregister(&gpio_keys_driver);
+}
+
+
+/* 7. 其他完善：提供设备信息，自动创建设备节点                                     */
+
+module_init(gpio_key_init);
+module_exit(gpio_key_exit);
+
+MODULE_LICENSE("GPL");
+
+
diff --git a/IMX6ULL/source/08_Interrupt/07_virtual_int_controller_hierarchy_ok/virtual_int_controller.c b/IMX6ULL/source/08_Interrupt/07_virtual_int_controller_hierarchy_ok/virtual_int_controller.c
new file mode 100644
index 0000000..fb961fd
--- /dev/null
+++ b/IMX6ULL/source/08_Interrupt/07_virtual_int_controller_hierarchy_ok/virtual_int_controller.c
@@ -0,0 +1,171 @@
+#include <linux/kernel.h>
+#include <linux/module.h>
+#include <linux/clk.h>
+#include <linux/err.h>
+#include <linux/init.h>
+#include <linux/interrupt.h>
+#include <linux/io.h>
+#include <linux/random.h>
+#include <linux/irq.h>
+#include <linux/irqdomain.h>
+#include <linux/irqchip/chained_irq.h>
+#include <linux/platform_device.h>
+#include <linux/pm_runtime.h>
+#include <linux/slab.h>
+#include <linux/gpio/driver.h>
+/* FIXME: for gpio_get_value() replace this with direct register read */
+#include <linux/gpio.h>
+#include <linux/of.h>
+#include <linux/of_irq.h>
+#include <linux/of_device.h>
+#include <linux/bug.h>
+
+
+static struct irq_domain *virtual_intc_domain;
+static u32 upper_hwirq_base;
+
+static int virtual_intc_domain_translate(struct irq_domain *d,
+				    struct irq_fwspec *fwspec,
+				    unsigned long *hwirq,
+				    unsigned int *type)
+{
+	if (is_of_node(fwspec->fwnode)) {
+		if (fwspec->param_count != 2)
+			return -EINVAL;
+
+		*hwirq = fwspec->param[0];
+		*type = fwspec->param[1];
+		return 0;
+	}
+
+	return -EINVAL;
+}
+
+static void virtual_intc_irq_unmask(struct irq_data *d)
+{
+	printk("%s %s %d\n", __FILE__, __FUNCTION__, __LINE__);
+	irq_chip_unmask_parent(d);
+}
+
+static void virtual_intc_irq_mask(struct irq_data *d)
+{
+	printk("%s %s %d\n", __FILE__, __FUNCTION__, __LINE__);
+	irq_chip_mask_parent(d);
+}
+
+static void virtual_intc_irq_eoi(struct irq_data *d)
+{
+	printk("%s %s %d\n", __FILE__, __FUNCTION__, __LINE__);
+	irq_chip_eoi_parent(d);
+}
+
+static struct irq_chip virtual_intc_chip = {
+	.name			= "virtual_intc",
+	.irq_mask		= virtual_intc_irq_mask,
+	.irq_unmask 	= virtual_intc_irq_unmask,
+	.irq_eoi        = virtual_intc_irq_eoi,
+};
+
+
+static int virtual_intc_domain_alloc(struct irq_domain *domain,
+				  unsigned int irq,
+				  unsigned int nr_irqs, void *data)
+{
+	struct irq_fwspec *fwspec = data;
+	struct irq_fwspec parent_fwspec;
+	irq_hw_number_t hwirq;
+	int i;
+	
+	/* 设置irq_desc[irq] */
+
+	/* 1. 设置irq_desc[irq].irq_data, 里面含有virtual_intc irq_chip */
+	hwirq = fwspec->param[0];
+	for (i = 0; i < nr_irqs; i++)
+		irq_domain_set_hwirq_and_chip(domain, irq + i, hwirq + i,
+					      &virtual_intc_chip, NULL);
+
+	/* 2. 设置irq_desc[irq].handle_irq,  来自GIC */
+	parent_fwspec.fwnode = domain->parent->fwnode;
+	parent_fwspec.param_count = 3;
+	parent_fwspec.param[0]    = 0; //GIC_SPI;
+	parent_fwspec.param[1]    = fwspec->param[0] + upper_hwirq_base;
+	parent_fwspec.param[2]    = fwspec->param[1];
+	
+	return irq_domain_alloc_irqs_parent(domain, irq, nr_irqs,
+					  &parent_fwspec);
+}
+
+static const struct irq_domain_ops virtual_intc_domain_ops = {
+	.translate	= virtual_intc_domain_translate,
+	.alloc		= virtual_intc_domain_alloc,
+};
+
+static int virtual_intc_probe(struct platform_device *pdev)
+{	
+
+	struct irq_domain *parent_domain;
+	struct device_node *parent;
+	int err;
+		
+
+	printk("%s %s %d\n", __FILE__, __FUNCTION__, __LINE__);
+	err = of_property_read_u32(pdev->dev.of_node, "upper_hwirq_base", &upper_hwirq_base);
+
+	parent = of_irq_find_parent(pdev->dev.of_node);
+	parent_domain = irq_find_host(parent);
+
+
+	/* 分配/设置/注册irq_domain */
+	virtual_intc_domain = irq_domain_add_hierarchy(parent_domain, 0, 4,
+					  pdev->dev.of_node, &virtual_intc_domain_ops,
+					  NULL);
+	
+	
+	return 0;
+}
+static int virtual_intc_remove(struct platform_device *pdev)
+{
+	printk("%s %s %d\n", __FILE__, __FUNCTION__, __LINE__);
+	return 0;
+}
+
+
+static const struct of_device_id virtual_intc_of_match[] = {
+	{ .compatible = "100ask,virtual_intc", },
+	{ },
+};
+
+
+static struct platform_driver virtual_intc_driver = {
+	.probe		= virtual_intc_probe,
+	.remove		= virtual_intc_remove,
+	.driver		= {
+		.name	= "100ask_virtual_intc",
+		.of_match_table = of_match_ptr(virtual_intc_of_match),
+	}
+};
+
+
+/* 1. 入口函数 */
+static int __init virtual_intc_init(void)
+{	
+	printk("%s %s %d\n", __FILE__, __FUNCTION__, __LINE__);
+	/* 1.1 注册一个platform_driver */
+	return platform_driver_register(&virtual_intc_driver);
+}
+
+
+/* 2. 出口函数 */
+static void __exit virtual_intc_exit(void)
+{
+	printk("%s %s %d\n", __FILE__, __FUNCTION__, __LINE__);
+	/* 2.1 反注册platform_driver */
+	platform_driver_unregister(&virtual_intc_driver);
+}
+
+module_init(virtual_intc_init);
+module_exit(virtual_intc_exit);
+
+MODULE_LICENSE("GPL");
+
+
diff --git a/IMX6ULL/source/08_Interrupt/07_virtual_int_controller_hierarchy_ok/virtual_intc.dts b/IMX6ULL/source/08_Interrupt/07_virtual_int_controller_hierarchy_ok/virtual_intc.dts
new file mode 100644
index 0000000..8579737
--- /dev/null
+++ b/IMX6ULL/source/08_Interrupt/07_virtual_int_controller_hierarchy_ok/virtual_intc.dts
@@ -0,0 +1,25 @@
+
+#define m 123
+
+/{
+   virtual_intc: virtual_intc_100ask {
+        compatible = "100ask,virtual_intc";
+
+        interrupt-controller;
+        #interrupt-cells = <2>;
+
+        interrupt-parent = <&intc>;
+		upper_hwirq_base = <122>;  // imx6ull
+		//upper_hwirq_base = <210>;  // stm32mp157
+    };
+
+    gpio_keys_100ask {
+        compatible = "100ask,gpio_key";
+        interrupt-parent = <&virtual_intc>;
+        interrupts = <0 IRQ_TYPE_LEVEL_HIGH>,
+                     <1 IRQ_TYPE_LEVEL_HIGH>,
+                     <2 IRQ_TYPE_LEVEL_HIGH>,
+                     <3 IRQ_TYPE_LEVEL_HIGH>;
+    };
+    
+};
diff --git a/README.md b/README.md
index 36f9e99..ebe4068 100644
--- a/README.md
+++ b/README.md
@@ -303,6 +303,8 @@ git clone https://e.coding.net/weidongshan/linux/doc_and_source_for_drivers.git
 
   ```shell
   17_链式中断控制器驱动程序编写_linear方式
+  18_层级中断控制器驱动程序编写
+  19_层级中断控制器驱动程序上机实验
   ```
 
 
diff --git a/STM32MP157/doc_pic/08_Interrupt/16_legacy方式代码的上机实验.md b/STM32MP157/doc_pic/08_Interrupt/16_legacy方式代码的上机实验.md
index 7d96ea4..e675b7a 100644
--- a/STM32MP157/doc_pic/08_Interrupt/16_legacy方式代码的上机实验.md
+++ b/STM32MP157/doc_pic/08_Interrupt/16_legacy方式代码的上机实验.md
@@ -256,7 +256,7 @@ GICD_ISPENDRn有多个寄存器，每个寄存器中每一位对应一个GIC中
 * 编译：
 
   * 在Ubuntu上
-  * 修改`003_virtual_int_controller_legacy`中的Makefile，指定内核路径`KERN_DIR`，在执行`make`命令即可。
+  * 修改`04_virtual_int_controller_legacy_ok`中的Makefile，指定内核路径`KERN_DIR`，在执行`make`命令即可。
 
 * 安装：
 
diff --git a/STM32MP157/doc_pic/08_Interrupt/18_层级中断控制器驱动程序编写与实验.md b/STM32MP157/doc_pic/08_Interrupt/18_层级中断控制器驱动程序编写.md
similarity index 89%
rename from STM32MP157/doc_pic/08_Interrupt/18_层级中断控制器驱动程序编写与实验.md
rename to STM32MP157/doc_pic/08_Interrupt/18_层级中断控制器驱动程序编写.md
index c4568b9..a922770 100644
--- a/STM32MP157/doc_pic/08_Interrupt/18_层级中断控制器驱动程序编写与实验.md
+++ b/STM32MP157/doc_pic/08_Interrupt/18_层级中断控制器驱动程序编写.md
@@ -1,4 +1,4 @@
-## 层级中断控制器驱动程序编写与实验
+## 层级中断控制器驱动程序编写
 
 参考资料：
 
@@ -20,11 +20,11 @@
   ```shell
   doc_and_source_for_drivers\
   	IMX6ULL\source\08_Interrupt\
-  		06_virtual_int_controller_hierarchy_ok
+  		06_virtual_int_controller_hierarchy
 	
   doc_and_source_for_drivers\
   	STM32MP157\source\A7\08_Interrupt\
-  		06_virtual_int_controller_hierarchy_ok
+  		06_virtual_int_controller_hierarchy
   ```
   
   
@@ -124,5 +124,15 @@
 
 会涉及2个驱动程序：虚拟的中断控制器驱动程序，按键驱动程序，以及对应的设备树。
 
+虚拟的中断控制器驱动程序中，涉及2个递归处理。
+
+#### 3.1 alloc的递归处理
+
+![image-20210705120414639](pic/08_Interrupt/083_hierarchy_alloc.png)
 
 
+
+#### 3.2 irq_chip的递归处理
+
+![image-20210705120547553](pic/08_Interrupt/084_hierarchy_irq_chip.png)
+
diff --git a/STM32MP157/doc_pic/08_Interrupt/18_层级中断控制器驱动程序编写.tif b/STM32MP157/doc_pic/08_Interrupt/18_层级中断控制器驱动程序编写.tif
new file mode 100644
index 0000000..9f0ce8f
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diff --git a/STM32MP157/doc_pic/08_Interrupt/19_层级中断控制器驱动程序上机实验.md b/STM32MP157/doc_pic/08_Interrupt/19_层级中断控制器驱动程序上机实验.md
new file mode 100644
index 0000000..6e059ed
--- /dev/null
+++ b/STM32MP157/doc_pic/08_Interrupt/19_层级中断控制器驱动程序上机实验.md
@@ -0,0 +1,299 @@
+## 层级中断控制器驱动程序上机实验
+
+参考资料：
+
+* [linux kernel的中断子系统之（七）：GIC代码分析](http://www.wowotech.net/irq_subsystem/gic_driver.html)
+
+* Linux 4.9.88内核源码
+
+  * `Linux-4.9.88\drivers\gpio\gpio-mxc.c`
+  * `Linux-4.9.88\arch\arm\boot\dts\imx6ull.dtsi`
+
+* Linux 5.4内核源码
+  
+  * `Linux-5.4\drivers\pinctrl\stm32\pinctrl-stm32mp157.c`
+  * `Linux-5.4\drivers\irqchip\irq-stm32-exti.c`
+  * `Linux-5.4\arch\arm\boot\dts\stm32mp151.dtsi`
+  
+* 芯片手册
+
+  * IMX6ULL: imx6ullrm.pdf
+  * STM32MP157: DM00327659.pdf
+  
+* 本节视频源码在GIT仓库里
+
+  ```shell
+  doc_and_source_for_drivers\
+  	IMX6ULL\source\08_Interrupt\
+  		07_virtual_int_controller_hierarchy_ok
+			
+  doc_and_source_for_drivers\
+  	STM32MP157\source\A7\08_Interrupt\
+  		07_virtual_int_controller_hierarchy_ok
+  ```
+  
+  
+
+### 1. 确定中断号n
+
+![](pic/08_Interrupt/076_virtual_intc_hardware.png)
+
+查看芯片手册，选择一个保留的、未使用的GIC SPI中断即可。
+
+#### 1.1 IMX6ULL
+
+看芯片手册第3章：
+
+![image-20210704072332512](pic/08_Interrupt/077_imx6ll_reserved_gic_int.png)
+
+看上图，选择122号中断，它是SPI里的122号中断，GIC里的编号是(32+122)=154。
+
+
+
+#### 1.2 STM32MP157
+
+看芯片手册第21.2节：
+
+![image-20210704072802087](pic/08_Interrupt/078_stm32mp157_reserved_gic_int.png)
+
+看上图，选择210号中断，它是SPI里的210号中断，GIC里的编号是(32+210)=242。
+
+### 2. 怎么触发中断
+
+可以通过devmem命令直接写GIC的PENDING寄存区。
+
+![image-20210704073305082](pic/08_Interrupt/079_GICD_ISPENDRn.png)
+
+GICD_ISPENDRn有多个寄存器，每个寄存器中每一位对应一个GIC中断，写入1就可以触发该中断。
+
+写哪一个GICD_ISPENDRn寄存器？写哪一位？使用下列公式来确定：
+
+![image-20210704073518013](pic/08_Interrupt/080_GICD_ISPENDRn_calc.png)
+
+查看内核设备树文件imx6ull.dtsi、stm32mp151.dtsi，可以知道：
+
+* IMX6ULL的GIC Distributor 地址是：0x00a01000
+  ![image-20210704103943340](pic/08_Interrupt/082_imx6ull_gic_dts.png)
+* STM32MP157的GIC Distributor 地址是：0xa0021000
+  ![image-20210704074850302](pic/08_Interrupt/081_stm32mp157_gic_dts.png)
+
+| 芯片       | SPI中断号 | GIC中断号 | n,bit | GICD_ISPENDRn地址 | 命令                          |
+| ---------- | --------- | --------- | ----- | ----------------- | ----------------------------- |
+| IMX6LLL    | 122       | 154       | 4,26  | 0xa01210          | devmem 0xa01210 32 0x4000000  |
+|            | 123       | 155       | 4,27  | 0xa01210          | devmem 0xa01210 32 0x8000000  |
+|            | 124       | 156       | 4,28  | 0xa01210          | devmem 0xa01210 32 0x10000000 |
+|            | 125       | 157       | 4,29  | 0xa01210          | devmem 0xa01210 32 0x20000000 |
+| STM32MP157 | 210       | 242       | 7,18  | 0xa002121c        | devmem 0xa002121c 32 0x40000  |
+|            | 211       | 243       | 7,19  | 0xa002121c        | devmem 0xa002121c 32 0x80000  |
+|            | 212       | 244       | 7,20  | 0xa002121c        | devmem 0xa002121c 32 0x100000 |
+|            | 213       | 245       | 7,21  | 0xa002121c        | devmem 0xa002121c 32 0x200000 |
+
+
+
+### 3. 上机实验
+
+#### 3.1 设置工具链
+
+##### 1. STM32MP157
+
+  ```shell
+  export ARCH=arm
+  export CROSS_COMPILE=arm-buildroot-linux-gnueabihf-
+  export PATH=$PATH:/home/book/100ask_stm32mp157_pro-sdk/ToolChain/arm-buildroot-linux-gnueabihf_sdk-buildroot/bin
+  ```
+
+##### 2. IMX6ULL
+
+  ```shell
+  export ARCH=arm
+  export CROSS_COMPILE=arm-linux-gnueabihf-
+  export PATH=$PATH:/home/book/100ask_imx6ull-sdk/ToolChain/gcc-linaro-6.2.1-2016.11-x86_64_arm-linux-gnueabihf/bin
+  ```
+
+
+
+#### 3.2 编译、替换设备树
+
+##### 1. STM32MP157
+
+  * 修改`arch/arm/boot/dts/stm32mp157c-100ask-512d-lcd-v1.dts`，添加如下代码：
+
+    ```shell
+    / {
+       virtual_intc: virtual_intc_100ask {
+            compatible = "100ask,virtual_intc";
+    
+            interrupt-controller;
+            #interrupt-cells = <2>;
+    
+            interrupt-parent = <&intc>;
+            //upper_hwirq_base = <122>;  // imx6ull
+            upper_hwirq_base = <210>;  // stm32mp157
+        };
+    
+        gpio_keys_100ask {
+            compatible = "100ask,gpio_key";
+            interrupt-parent = <&virtual_intc>;
+            interrupts = <0 IRQ_TYPE_LEVEL_HIGH>,
+                         <1 IRQ_TYPE_LEVEL_HIGH>,
+                         <2 IRQ_TYPE_LEVEL_HIGH>,
+                         <3 IRQ_TYPE_LEVEL_HIGH>;
+        };
+    };
+    ```
+
+    
+
+  * 编译设备树：
+    在Ubuntu的STM32MP157内核目录下执行如下命令,
+    得到设备树文件：`arch/arm/boot/dts/stm32mp157c-100ask-512d-lcd-v1.dtb`
+
+    ```shell
+    make dtbs
+    ```
+
+  * 复制到NFS目录：
+
+    ```shell
+    $ cp arch/arm/boot/dts/stm32mp157c-100ask-512d-lcd-v1.dtb ~/nfs_rootfs/
+    ```
+
+  * 开发板上挂载NFS文件系统
+
+    * vmware使用NAT(假设windowsIP为192.168.1.100)
+
+      ```shell
+      [root@100ask:~]# mount -t nfs -o nolock,vers=3,port=2049,mountport=9999 
+      192.168.1.100:/home/book/nfs_rootfs /mnt
+      ```
+
+    * vmware使用桥接，或者不使用vmware而是直接使用服务器：假设Ubuntu IP为192.168.1.137
+
+      ```shell
+      [root@100ask:~]#  mount -t nfs -o nolock,vers=3 192.168.1.137:/home/book/nfs_rootfs /mnt
+      ```
+
+* 更新设备树
+
+  ```shell
+  [root@100ask:~]# mount  /dev/mmcblk2p2  /boot
+  [root@100ask:~]# cp /mnt/stm32mp157c-100ask-512d-lcd-v1.dtb /boot
+  [root@100ask:~]# sync
+  ```
+
+* 重启开发板
+
+  
+
+
+
+##### 2. IMX6ULL
+
+  * 修改`arch/arm/boot/dts/100ask_imx6ull-14x14.dts`，添加如下代码：
+
+    ```shell
+    / {
+       virtual_intc: virtual_intc_100ask {
+            compatible = "100ask,virtual_intc";
+    
+            interrupt-controller;
+            #interrupt-cells = <2>;
+    
+            interrupt-parent = <&intc>;
+            upper_hwirq_base = <122>;  // imx6ull
+            //upper_hwirq_base = <210>;  // stm32mp157
+        };
+    
+        gpio_keys_100ask {
+            compatible = "100ask,gpio_key";
+            interrupt-parent = <&virtual_intc>;
+            interrupts = <0 IRQ_TYPE_LEVEL_HIGH>,
+                         <1 IRQ_TYPE_LEVEL_HIGH>,
+                         <2 IRQ_TYPE_LEVEL_HIGH>,
+                         <3 IRQ_TYPE_LEVEL_HIGH>;
+        };
+    
+    };
+    ```
+
+    
+
+  * 编译设备树：
+    在Ubuntu的IMX6ULL内核目录下执行如下命令,
+    得到设备树文件：`arch/arm/boot/dts/100ask_imx6ull-14x14.dtb`
+
+    ```shell
+    make dtbs
+    ```
+
+  * 复制到NFS目录：
+
+    ```shell
+    $ cp arch/arm/boot/dts/100ask_imx6ull-14x14.dtb ~/nfs_rootfs/
+    ```
+
+* 开发板上挂载NFS文件系统
+
+  * vmware使用NAT(假设windowsIP为192.168.1.100)
+
+    ```shell
+    [root@100ask:~]# mount -t nfs -o nolock,vers=3,port=2049,mountport=9999 
+    192.168.1.100:/home/book/nfs_rootfs /mnt
+    ```
+
+  * vmware使用桥接，或者不使用vmware而是直接使用服务器：假设Ubuntu IP为192.168.1.137
+
+    ```shell
+    [root@100ask:~]#  mount -t nfs -o nolock,vers=3 192.168.1.137:/home/book/nfs_rootfs /mnt
+    ```
+
+  * 更新设备树
+
+    ```shell
+    [root@100ask:~]# cp /mnt/100ask_imx6ull-14x14.dtb /boot
+    [root@100ask:~]# sync
+    ```
+
+* 重启开发板
+
+
+
+#### 3.3 编译、安装驱动程序
+
+* 编译：
+
+  * 在Ubuntu上
+  * 修改`07_virtual_int_controller_hierarchy_ok`中的Makefile，指定内核路径`KERN_DIR`，在执行`make`命令即可。
+
+* 安装：
+
+  * 在开发板上
+
+  * 挂载NFS，复制文件，insmod，类似如下命令：
+
+    ```shell
+    mount -t nfs -o nolock,vers=3 192.168.1.137:/home/book/nfs_rootfs /mnt
+    // 对于IMX6ULL，想看到驱动打印信息，需要先执行
+    echo "7 4 1 7" > /proc/sys/kernel/printk
+    
+    insmod -f /mnt/virtual_int_controller.ko
+    // 安装virtual_int_controller之后即可进入/sys/kernel/irq目录查看分配的中断号
+    
+    insmod -f /mnt/gpio_key_drv.ko
+    cat /proc/interrupts
+    
+    // 触发中断
+    // 对于IMX6ULL
+    devmem 0xa01210 32 0x4000000
+    devmem 0xa01210 32 0x8000000
+    devmem 0xa01210 32 0x10000000
+    devmem 0xa01210 32 0x20000000
+    
+    // 对于stm32mp157
+    devmem 0xa002121c 32 0x40000 
+    devmem 0xa002121c 32 0x80000
+    devmem 0xa002121c 32 0x100000  // 它不能触发中断,可能是被占用了
+    devmem 0xa002121c 32 0x200000
+    ```
+
+* 观察内核打印的信息
diff --git a/STM32MP157/doc_pic/08_Interrupt/pic/08_Interrupt/083_hierarchy_alloc.png b/STM32MP157/doc_pic/08_Interrupt/pic/08_Interrupt/083_hierarchy_alloc.png
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index 0000000..ce08f3a
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diff --git a/STM32MP157/doc_pic/08_Interrupt/pic/08_Interrupt/084_hierarchy_irq_chip.png b/STM32MP157/doc_pic/08_Interrupt/pic/08_Interrupt/084_hierarchy_irq_chip.png
new file mode 100644
index 0000000..1641ea6
Binary files /dev/null and b/STM32MP157/doc_pic/08_Interrupt/pic/08_Interrupt/084_hierarchy_irq_chip.png differ
diff --git a/STM32MP157/source/A7/08_Interrupt/06_virtual_int_controller_hierarchy/Makefile b/STM32MP157/source/A7/08_Interrupt/06_virtual_int_controller_hierarchy/Makefile
new file mode 100644
index 0000000..e957daf
--- /dev/null
+++ b/STM32MP157/source/A7/08_Interrupt/06_virtual_int_controller_hierarchy/Makefile
@@ -0,0 +1,21 @@
+
+# 1. 使用不同的开发板内核时, 一定要修改KERN_DIR
+# 2. KERN_DIR中的内核要事先配置、编译, 为了能编译内核, 要先设置下列环境变量:
+# 2.1 ARCH,          比如: export ARCH=arm64
+# 2.2 CROSS_COMPILE, 比如: export CROSS_COMPILE=aarch64-linux-gnu-
+# 2.3 PATH,          比如: export PATH=$PATH:/home/book/100ask_roc-rk3399-pc/ToolChain-6.3.1/gcc-linaro-6.3.1-2017.05-x86_64_aarch64-linux-gnu/bin 
+# 注意: 不同的开发板不同的编译器上述3个环境变量不一定相同,
+#       请参考各开发板的高级用户使用手册
+
+KERN_DIR = /home/book/100ask_stm32mp157_pro-sdk/Linux-5.4
+
+all:
+	make -C $(KERN_DIR) M=`pwd` modules 
+
+clean:
+	make -C $(KERN_DIR) M=`pwd` modules clean
+	rm -rf modules.order
+
+obj-m	+= virtual_int_controller.o
+obj-m   += gpio_key_drv.o
+
diff --git a/STM32MP157/source/A7/08_Interrupt/06_virtual_int_controller_hierarchy/gpio_key_drv.c b/STM32MP157/source/A7/08_Interrupt/06_virtual_int_controller_hierarchy/gpio_key_drv.c
new file mode 100644
index 0000000..dfd7d26
--- /dev/null
+++ b/STM32MP157/source/A7/08_Interrupt/06_virtual_int_controller_hierarchy/gpio_key_drv.c
@@ -0,0 +1,125 @@
+#include <linux/module.h>
+
+#include <linux/fs.h>
+#include <linux/errno.h>
+#include <linux/miscdevice.h>
+#include <linux/kernel.h>
+#include <linux/major.h>
+#include <linux/mutex.h>
+#include <linux/proc_fs.h>
+#include <linux/seq_file.h>
+#include <linux/stat.h>
+#include <linux/init.h>
+#include <linux/device.h>
+#include <linux/tty.h>
+#include <linux/kmod.h>
+#include <linux/gfp.h>
+#include <linux/gpio/consumer.h>
+#include <linux/platform_device.h>
+#include <linux/of_gpio.h>
+#include <linux/of_irq.h>
+#include <linux/interrupt.h>
+#include <linux/irq.h>
+#include <linux/slab.h>
+
+
+struct gpio_key{
+	char name[100];
+	int irq;
+	int cnt;
+} ;
+
+static struct gpio_key gpio_keys_100ask[100];
+
+static irqreturn_t gpio_key_isr(int irq, void *dev_id)
+{
+	struct gpio_key *gpio_key = dev_id;
+	
+
+	printk("gpio_key_isr %s cnt %d\n", gpio_key->name, gpio_key->cnt++);
+	
+	return IRQ_HANDLED;
+}
+
+/* 1. 从platform_device获得GPIO
+ * 2. gpio=>irq
+ * 3. request_irq
+ */
+static int gpio_key_probe(struct platform_device *pdev)
+{
+	int err;
+	int i = 0;
+	int irq;
+		
+	printk("%s %s line %d\n", __FILE__, __FUNCTION__, __LINE__);
+
+
+	while (1)
+	{
+		irq = platform_get_irq(pdev, i);
+		if (irq <= 0)
+			break;
+		gpio_keys_100ask[i].irq = irq;
+		sprintf(gpio_keys_100ask[i].name, "100as_virtual_key%d", i);
+		
+		err = devm_request_irq(&pdev->dev, gpio_keys_100ask[i].irq, gpio_key_isr, IRQF_TRIGGER_RISING | IRQF_TRIGGER_FALLING, gpio_keys_100ask[i].name, &gpio_keys_100ask[i]);
+		printk("devm_request_irq %d for %s, err = %d\n", irq, gpio_keys_100ask[i].name, err);
+		i++;
+	}
+        
+    return 0;
+    
+}
+
+static int gpio_key_remove(struct platform_device *pdev)
+{
+    return 0;
+}
+
+
+static const struct of_device_id ask100_keys[] = {
+    { .compatible = "100ask,gpio_key" },
+    { },
+};
+
+/* 1. 定义platform_driver */
+static struct platform_driver gpio_keys_driver = {
+    .probe      = gpio_key_probe,
+    .remove     = gpio_key_remove,
+    .driver     = {
+        .name   = "100ask_gpio_key",
+        .of_match_table = ask100_keys,
+    },
+};
+
+/* 2. 在入口函数注册platform_driver */
+static int __init gpio_key_init(void)
+{
+    int err;
+    
+	printk("%s %s line %d\n", __FILE__, __FUNCTION__, __LINE__);
+	
+    err = platform_driver_register(&gpio_keys_driver); 
+	
+	return err;
+}
+
+/* 3. 有入口函数就应该有出口函数：卸载驱动程序时，就会去调用这个出口函数
+ *     卸载platform_driver
+ */
+static void __exit gpio_key_exit(void)
+{
+	printk("%s %s line %d\n", __FILE__, __FUNCTION__, __LINE__);
+
+    platform_driver_unregister(&gpio_keys_driver);
+}
+
+
+/* 7. 其他完善：提供设备信息，自动创建设备节点                                     */
+
+module_init(gpio_key_init);
+module_exit(gpio_key_exit);
+
+MODULE_LICENSE("GPL");
+
+
diff --git a/STM32MP157/source/A7/08_Interrupt/06_virtual_int_controller_hierarchy/virtual_int_controller.c b/STM32MP157/source/A7/08_Interrupt/06_virtual_int_controller_hierarchy/virtual_int_controller.c
new file mode 100644
index 0000000..fe078a4
--- /dev/null
+++ b/STM32MP157/source/A7/08_Interrupt/06_virtual_int_controller_hierarchy/virtual_int_controller.c
@@ -0,0 +1,163 @@
+#include <linux/kernel.h>
+#include <linux/module.h>
+#include <linux/clk.h>
+#include <linux/err.h>
+#include <linux/init.h>
+#include <linux/interrupt.h>
+#include <linux/io.h>
+#include <linux/random.h>
+#include <linux/irq.h>
+#include <linux/irqdomain.h>
+#include <linux/irqchip/chained_irq.h>
+#include <linux/platform_device.h>
+#include <linux/pm_runtime.h>
+#include <linux/slab.h>
+#include <linux/gpio/driver.h>
+/* FIXME: for gpio_get_value() replace this with direct register read */
+#include <linux/gpio.h>
+#include <linux/of.h>
+#include <linux/of_device.h>
+#include <linux/bug.h>
+
+
+static struct irq_domain *virtual_intc_domain;
+static u32 upper_hwirq_base;
+
+static int virtual_intc_domain_translate(struct irq_domain *d,
+				    struct irq_fwspec *fwspec,
+				    unsigned long *hwirq,
+				    unsigned int *type)
+{
+	if (is_of_node(fwspec->fwnode)) {
+		if (fwspec->param_count != 2)
+			return -EINVAL;
+
+		*hwirq = fwspec->param[0];
+		*type = fwspec->param[1];
+		return 0;
+	}
+
+	return -EINVAL;
+}
+
+static void virtual_intc_irq_unmask(struct irq_data *d)
+{
+	printk("%s %s %d\n", __FILE__, __FUNCTION__, __LINE__);
+	irq_chip_unmask_parent(d);
+}
+
+static void virtual_intc_irq_mask(struct irq_data *d)
+{
+	printk("%s %s %d\n", __FILE__, __FUNCTION__, __LINE__);
+	irq_chip_mask_parent(d);
+}
+
+static struct irq_chip virtual_intc_chip = {
+	.name			= "virtual_intc",
+	.irq_mask		= virtual_intc_irq_mask,
+	.irq_unmask 	= virtual_intc_irq_unmask,
+};
+
+
+static int virtual_intc_domain_alloc(struct irq_domain *domain,
+				  unsigned int irq,
+				  unsigned int nr_irqs, void *data)
+{
+	struct irq_fwspec *fwspec = data;
+	struct irq_fwspec parent_fwspec;
+	irq_hw_number_t hwirq;
+	int i;
+	
+	/* 设置irq_desc[irq] */
+
+	/* 1. 设置irq_desc[irq].irq_data, 里面含有virtual_intc irq_chip */
+	hwirq = fwspec->param[0];
+	for (i = 0; i < nr_irqs; i++)
+		irq_domain_set_hwirq_and_chip(domain, irq + i, hwirq + i,
+					      &virtual_intc_chip, NULL);
+
+	/* 2. 设置irq_desc[irq].handle_irq,  来自GIC */
+	parent_fwspec.fwnode = domain->parent->fwnode;
+	parent_fwspec.param_count = 3;
+	parent_fwspec.param[0]    = GIC_SPI;
+	parent_fwspec.param[1]    = fwspec->param[0] + upper_hwirq_base;
+	parent_fwspec.param[2]    = fwspec->param[1];
+	
+	return irq_domain_alloc_irqs_parent(domain, irq, nr_irqs,
+					  &parent_fwspec);
+}
+
+static const struct irq_domain_ops virtual_intc_domain_ops = {
+	.translate	= virtual_intc_domain_translate,
+	.alloc		= virtual_intc_domain_alloc,
+};
+
+static int virtual_intc_probe(struct platform_device *pdev)
+{	
+
+	struct irq_domain *parent_domain;
+	struct device_node *parent;
+	int err;
+		
+
+	printk("%s %s %d\n", __FILE__, __FUNCTION__, __LINE__);
+	err = of_property_read_u32(pdev->dev.of_node, "upper_hwirq_base", &upper_hwirq_base);
+
+	parent = of_irq_find_parent(pdev->dev.of_node);
+	parent_domain = irq_find_host(parent);
+
+
+	/* 分配/设置/注册irq_domain */
+	virtual_intc_domain = irq_domain_add_hierarchy(parent_domain, 0, 4,
+					  pdev->dev.of_node, &virtual_intc_domain_ops,
+					  NULL);
+	
+	
+	return 0;
+}
+static int virtual_intc_remove(struct platform_device *pdev)
+{
+	printk("%s %s %d\n", __FILE__, __FUNCTION__, __LINE__);
+	return 0;
+}
+
+
+static const struct of_device_id virtual_intc_of_match[] = {
+	{ .compatible = "100ask,virtual_intc", },
+	{ },
+};
+
+
+static struct platform_driver virtual_intc_driver = {
+	.probe		= virtual_intc_probe,
+	.remove		= virtual_intc_remove,
+	.driver		= {
+		.name	= "100ask_virtual_intc",
+		.of_match_table = of_match_ptr(virtual_intc_of_match),
+	}
+};
+
+
+/* 1. 入口函数 */
+static int __init virtual_intc_init(void)
+{	
+	printk("%s %s %d\n", __FILE__, __FUNCTION__, __LINE__);
+	/* 1.1 注册一个platform_driver */
+	return platform_driver_register(&virtual_intc_driver);
+}
+
+
+/* 2. 出口函数 */
+static void __exit virtual_intc_exit(void)
+{
+	printk("%s %s %d\n", __FILE__, __FUNCTION__, __LINE__);
+	/* 2.1 反注册platform_driver */
+	platform_driver_unregister(&virtual_intc_driver);
+}
+
+module_init(virtual_intc_init);
+module_exit(virtual_intc_exit);
+
+MODULE_LICENSE("GPL");
+
+
diff --git a/STM32MP157/source/A7/08_Interrupt/06_virtual_int_controller_hierarchy/virtual_intc.dts b/STM32MP157/source/A7/08_Interrupt/06_virtual_int_controller_hierarchy/virtual_intc.dts
new file mode 100644
index 0000000..e99d176
--- /dev/null
+++ b/STM32MP157/source/A7/08_Interrupt/06_virtual_int_controller_hierarchy/virtual_intc.dts
@@ -0,0 +1,24 @@
+
+#define m 123
+
+/{
+   virtual_intc: virtual_intc_100ask {
+        compatible = "100ask,virtual_intc";
+
+        interrupt-controller;
+        #interrupt-cells = <2>;
+
+        interrupt-parent = <&intc>;
+		upper_hwirq_base = <m>;
+    };
+
+    gpio_keys_100ask {
+        compatible = "100ask,gpio_key";
+        interrupt-parent = <&virtual_intc>;
+        interrupts = <0 IRQ_TYPE_LEVEL_HIGH>,
+                     <1 IRQ_TYPE_LEVEL_HIGH>,
+                     <2 IRQ_TYPE_LEVEL_HIGH>,
+                     <3 IRQ_TYPE_LEVEL_HIGH>;
+    };
+    
+};
diff --git a/STM32MP157/source/A7/08_Interrupt/07_virtual_int_controller_hierarchy_ok/Makefile b/STM32MP157/source/A7/08_Interrupt/07_virtual_int_controller_hierarchy_ok/Makefile
new file mode 100644
index 0000000..e957daf
--- /dev/null
+++ b/STM32MP157/source/A7/08_Interrupt/07_virtual_int_controller_hierarchy_ok/Makefile
@@ -0,0 +1,21 @@
+
+# 1. 使用不同的开发板内核时, 一定要修改KERN_DIR
+# 2. KERN_DIR中的内核要事先配置、编译, 为了能编译内核, 要先设置下列环境变量:
+# 2.1 ARCH,          比如: export ARCH=arm64
+# 2.2 CROSS_COMPILE, 比如: export CROSS_COMPILE=aarch64-linux-gnu-
+# 2.3 PATH,          比如: export PATH=$PATH:/home/book/100ask_roc-rk3399-pc/ToolChain-6.3.1/gcc-linaro-6.3.1-2017.05-x86_64_aarch64-linux-gnu/bin 
+# 注意: 不同的开发板不同的编译器上述3个环境变量不一定相同,
+#       请参考各开发板的高级用户使用手册
+
+KERN_DIR = /home/book/100ask_stm32mp157_pro-sdk/Linux-5.4
+
+all:
+	make -C $(KERN_DIR) M=`pwd` modules 
+
+clean:
+	make -C $(KERN_DIR) M=`pwd` modules clean
+	rm -rf modules.order
+
+obj-m	+= virtual_int_controller.o
+obj-m   += gpio_key_drv.o
+
diff --git a/STM32MP157/source/A7/08_Interrupt/07_virtual_int_controller_hierarchy_ok/gpio_key_drv.c b/STM32MP157/source/A7/08_Interrupt/07_virtual_int_controller_hierarchy_ok/gpio_key_drv.c
new file mode 100644
index 0000000..dfd7d26
--- /dev/null
+++ b/STM32MP157/source/A7/08_Interrupt/07_virtual_int_controller_hierarchy_ok/gpio_key_drv.c
@@ -0,0 +1,125 @@
+#include <linux/module.h>
+
+#include <linux/fs.h>
+#include <linux/errno.h>
+#include <linux/miscdevice.h>
+#include <linux/kernel.h>
+#include <linux/major.h>
+#include <linux/mutex.h>
+#include <linux/proc_fs.h>
+#include <linux/seq_file.h>
+#include <linux/stat.h>
+#include <linux/init.h>
+#include <linux/device.h>
+#include <linux/tty.h>
+#include <linux/kmod.h>
+#include <linux/gfp.h>
+#include <linux/gpio/consumer.h>
+#include <linux/platform_device.h>
+#include <linux/of_gpio.h>
+#include <linux/of_irq.h>
+#include <linux/interrupt.h>
+#include <linux/irq.h>
+#include <linux/slab.h>
+
+
+struct gpio_key{
+	char name[100];
+	int irq;
+	int cnt;
+} ;
+
+static struct gpio_key gpio_keys_100ask[100];
+
+static irqreturn_t gpio_key_isr(int irq, void *dev_id)
+{
+	struct gpio_key *gpio_key = dev_id;
+	
+
+	printk("gpio_key_isr %s cnt %d\n", gpio_key->name, gpio_key->cnt++);
+	
+	return IRQ_HANDLED;
+}
+
+/* 1. 从platform_device获得GPIO
+ * 2. gpio=>irq
+ * 3. request_irq
+ */
+static int gpio_key_probe(struct platform_device *pdev)
+{
+	int err;
+	int i = 0;
+	int irq;
+		
+	printk("%s %s line %d\n", __FILE__, __FUNCTION__, __LINE__);
+
+
+	while (1)
+	{
+		irq = platform_get_irq(pdev, i);
+		if (irq <= 0)
+			break;
+		gpio_keys_100ask[i].irq = irq;
+		sprintf(gpio_keys_100ask[i].name, "100as_virtual_key%d", i);
+		
+		err = devm_request_irq(&pdev->dev, gpio_keys_100ask[i].irq, gpio_key_isr, IRQF_TRIGGER_RISING | IRQF_TRIGGER_FALLING, gpio_keys_100ask[i].name, &gpio_keys_100ask[i]);
+		printk("devm_request_irq %d for %s, err = %d\n", irq, gpio_keys_100ask[i].name, err);
+		i++;
+	}
+        
+    return 0;
+    
+}
+
+static int gpio_key_remove(struct platform_device *pdev)
+{
+    return 0;
+}
+
+
+static const struct of_device_id ask100_keys[] = {
+    { .compatible = "100ask,gpio_key" },
+    { },
+};
+
+/* 1. 定义platform_driver */
+static struct platform_driver gpio_keys_driver = {
+    .probe      = gpio_key_probe,
+    .remove     = gpio_key_remove,
+    .driver     = {
+        .name   = "100ask_gpio_key",
+        .of_match_table = ask100_keys,
+    },
+};
+
+/* 2. 在入口函数注册platform_driver */
+static int __init gpio_key_init(void)
+{
+    int err;
+    
+	printk("%s %s line %d\n", __FILE__, __FUNCTION__, __LINE__);
+	
+    err = platform_driver_register(&gpio_keys_driver); 
+	
+	return err;
+}
+
+/* 3. 有入口函数就应该有出口函数：卸载驱动程序时，就会去调用这个出口函数
+ *     卸载platform_driver
+ */
+static void __exit gpio_key_exit(void)
+{
+	printk("%s %s line %d\n", __FILE__, __FUNCTION__, __LINE__);
+
+    platform_driver_unregister(&gpio_keys_driver);
+}
+
+
+/* 7. 其他完善：提供设备信息，自动创建设备节点                                     */
+
+module_init(gpio_key_init);
+module_exit(gpio_key_exit);
+
+MODULE_LICENSE("GPL");
+
+
diff --git a/STM32MP157/source/A7/08_Interrupt/07_virtual_int_controller_hierarchy_ok/virtual_int_controller.c b/STM32MP157/source/A7/08_Interrupt/07_virtual_int_controller_hierarchy_ok/virtual_int_controller.c
new file mode 100644
index 0000000..fb961fd
--- /dev/null
+++ b/STM32MP157/source/A7/08_Interrupt/07_virtual_int_controller_hierarchy_ok/virtual_int_controller.c
@@ -0,0 +1,171 @@
+#include <linux/kernel.h>
+#include <linux/module.h>
+#include <linux/clk.h>
+#include <linux/err.h>
+#include <linux/init.h>
+#include <linux/interrupt.h>
+#include <linux/io.h>
+#include <linux/random.h>
+#include <linux/irq.h>
+#include <linux/irqdomain.h>
+#include <linux/irqchip/chained_irq.h>
+#include <linux/platform_device.h>
+#include <linux/pm_runtime.h>
+#include <linux/slab.h>
+#include <linux/gpio/driver.h>
+/* FIXME: for gpio_get_value() replace this with direct register read */
+#include <linux/gpio.h>
+#include <linux/of.h>
+#include <linux/of_irq.h>
+#include <linux/of_device.h>
+#include <linux/bug.h>
+
+
+static struct irq_domain *virtual_intc_domain;
+static u32 upper_hwirq_base;
+
+static int virtual_intc_domain_translate(struct irq_domain *d,
+				    struct irq_fwspec *fwspec,
+				    unsigned long *hwirq,
+				    unsigned int *type)
+{
+	if (is_of_node(fwspec->fwnode)) {
+		if (fwspec->param_count != 2)
+			return -EINVAL;
+
+		*hwirq = fwspec->param[0];
+		*type = fwspec->param[1];
+		return 0;
+	}
+
+	return -EINVAL;
+}
+
+static void virtual_intc_irq_unmask(struct irq_data *d)
+{
+	printk("%s %s %d\n", __FILE__, __FUNCTION__, __LINE__);
+	irq_chip_unmask_parent(d);
+}
+
+static void virtual_intc_irq_mask(struct irq_data *d)
+{
+	printk("%s %s %d\n", __FILE__, __FUNCTION__, __LINE__);
+	irq_chip_mask_parent(d);
+}
+
+static void virtual_intc_irq_eoi(struct irq_data *d)
+{
+	printk("%s %s %d\n", __FILE__, __FUNCTION__, __LINE__);
+	irq_chip_eoi_parent(d);
+}
+
+static struct irq_chip virtual_intc_chip = {
+	.name			= "virtual_intc",
+	.irq_mask		= virtual_intc_irq_mask,
+	.irq_unmask 	= virtual_intc_irq_unmask,
+	.irq_eoi        = virtual_intc_irq_eoi,
+};
+
+
+static int virtual_intc_domain_alloc(struct irq_domain *domain,
+				  unsigned int irq,
+				  unsigned int nr_irqs, void *data)
+{
+	struct irq_fwspec *fwspec = data;
+	struct irq_fwspec parent_fwspec;
+	irq_hw_number_t hwirq;
+	int i;
+	
+	/* 设置irq_desc[irq] */
+
+	/* 1. 设置irq_desc[irq].irq_data, 里面含有virtual_intc irq_chip */
+	hwirq = fwspec->param[0];
+	for (i = 0; i < nr_irqs; i++)
+		irq_domain_set_hwirq_and_chip(domain, irq + i, hwirq + i,
+					      &virtual_intc_chip, NULL);
+
+	/* 2. 设置irq_desc[irq].handle_irq,  来自GIC */
+	parent_fwspec.fwnode = domain->parent->fwnode;
+	parent_fwspec.param_count = 3;
+	parent_fwspec.param[0]    = 0; //GIC_SPI;
+	parent_fwspec.param[1]    = fwspec->param[0] + upper_hwirq_base;
+	parent_fwspec.param[2]    = fwspec->param[1];
+	
+	return irq_domain_alloc_irqs_parent(domain, irq, nr_irqs,
+					  &parent_fwspec);
+}
+
+static const struct irq_domain_ops virtual_intc_domain_ops = {
+	.translate	= virtual_intc_domain_translate,
+	.alloc		= virtual_intc_domain_alloc,
+};
+
+static int virtual_intc_probe(struct platform_device *pdev)
+{	
+
+	struct irq_domain *parent_domain;
+	struct device_node *parent;
+	int err;
+		
+
+	printk("%s %s %d\n", __FILE__, __FUNCTION__, __LINE__);
+	err = of_property_read_u32(pdev->dev.of_node, "upper_hwirq_base", &upper_hwirq_base);
+
+	parent = of_irq_find_parent(pdev->dev.of_node);
+	parent_domain = irq_find_host(parent);
+
+
+	/* 分配/设置/注册irq_domain */
+	virtual_intc_domain = irq_domain_add_hierarchy(parent_domain, 0, 4,
+					  pdev->dev.of_node, &virtual_intc_domain_ops,
+					  NULL);
+	
+	
+	return 0;
+}
+static int virtual_intc_remove(struct platform_device *pdev)
+{
+	printk("%s %s %d\n", __FILE__, __FUNCTION__, __LINE__);
+	return 0;
+}
+
+
+static const struct of_device_id virtual_intc_of_match[] = {
+	{ .compatible = "100ask,virtual_intc", },
+	{ },
+};
+
+
+static struct platform_driver virtual_intc_driver = {
+	.probe		= virtual_intc_probe,
+	.remove		= virtual_intc_remove,
+	.driver		= {
+		.name	= "100ask_virtual_intc",
+		.of_match_table = of_match_ptr(virtual_intc_of_match),
+	}
+};
+
+
+/* 1. 入口函数 */
+static int __init virtual_intc_init(void)
+{	
+	printk("%s %s %d\n", __FILE__, __FUNCTION__, __LINE__);
+	/* 1.1 注册一个platform_driver */
+	return platform_driver_register(&virtual_intc_driver);
+}
+
+
+/* 2. 出口函数 */
+static void __exit virtual_intc_exit(void)
+{
+	printk("%s %s %d\n", __FILE__, __FUNCTION__, __LINE__);
+	/* 2.1 反注册platform_driver */
+	platform_driver_unregister(&virtual_intc_driver);
+}
+
+module_init(virtual_intc_init);
+module_exit(virtual_intc_exit);
+
+MODULE_LICENSE("GPL");
+
+
diff --git a/STM32MP157/source/A7/08_Interrupt/07_virtual_int_controller_hierarchy_ok/virtual_intc.dts b/STM32MP157/source/A7/08_Interrupt/07_virtual_int_controller_hierarchy_ok/virtual_intc.dts
new file mode 100644
index 0000000..581631c
--- /dev/null
+++ b/STM32MP157/source/A7/08_Interrupt/07_virtual_int_controller_hierarchy_ok/virtual_intc.dts
@@ -0,0 +1,25 @@
+
+#define m 123
+
+/{
+   virtual_intc: virtual_intc_100ask {
+        compatible = "100ask,virtual_intc";
+
+        interrupt-controller;
+        #interrupt-cells = <2>;
+
+        interrupt-parent = <&intc>;
+		//upper_hwirq_base = <122>;  // imx6ull
+		upper_hwirq_base = <210>;  // stm32mp157
+    };
+
+    gpio_keys_100ask {
+        compatible = "100ask,gpio_key";
+        interrupt-parent = <&virtual_intc>;
+        interrupts = <0 IRQ_TYPE_LEVEL_HIGH>,
+                     <1 IRQ_TYPE_LEVEL_HIGH>,
+                     <2 IRQ_TYPE_LEVEL_HIGH>,
+                     <3 IRQ_TYPE_LEVEL_HIGH>;
+    };
+    
+};