add: 03_LCD/12_编程_引脚配置_基于STM32MP157

STM32MP157/doc_pic/03_LCD/12_编程_配置引脚_基于STM32MP157.md

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+## 编程\_配置引脚\_基于STM32MP157
+
+参考资料，GIT仓库里：
+
+* 芯片资料
+  
+  * `STM32MP157\开发板配套资料\datasheeet\02_Core_board(核心板)\CPU\CPU开发参考手册\DM00327659.pdf`
+    * `《35 LCD-TFT display controller (LTDC)》`
+  
+* STM32MP157的LCD裸机程序
+
+  * `STM32MP157\source\A7\03_LCD\05_参考的裸机源码\03_font_test`
+
+* 内核自带的STM32MP157 LCD驱动程序
+  * 驱动源码：
+  
+    * LCD相关：`Linux-5.4\drivers\gpu\drm\panel\panel-myir070tft.c`
+    * LCD控制器相关：`Linux-5.4\drivers\gpu\drm\stm\ltdc.c`
+    * GPU相关：`Linux-5.4\drivers\gpu\drm\stm\drv.c`
+  * 设备树：
+    * `Linux-5.4/arch/arm/boot/dts/stm32mp157c-100ask-512d-lcd-v1.dts`
+    * `Linux-5.4/arch/arm/boot/dts/stm32mp151.dtsi`
+    * `Linux-5.4/arch/arm/boot/dts/stm32mp15-pinctrl.dtsi`
+  
+* 本节视频编写好的代码
+  
+  * `STM32MP157\source\A7\03_LCD\07_lcd_drv_pin_config_use_devicetree`
+  
+* 引脚配置工具/设备树生成工具
+
+  * 打开：http://download.100ask.net/
+  * 找到开发板："100ASK_STM32MP157_PRO开发板"
+  * 下载开发板配套资料
+  * 下载完后，工具在如下目录里：
+
+  ![image-20210122094724188](pic/02_LCD驱动/041_pins_tools.png)
+
+### 1. 硬件相关的操作
+
+LCD驱动程序的核心就是：
+
+* 分配fb_info
+* 设置fb_info
+* 注册fb_info
+* 硬件相关的设置
+
+
+
+硬件相关的设置又可以分为3部分：
+  * 引脚设置
+  * 时钟设置
+  * LCD控制器设置
+
+
+
+### 2. 引脚配置
+
+主要使用pinctrl子系统把引脚配置为LCD功能，对于背光引脚等使用GPIO子系统的函数控制它的输出电平。
+
+#### 2.1 使用pinctrl配置LCD引脚
+
+
+
+#### 2.2 使用GPIO子系统控制背光

STM32MP157/source/A7/03_LCD/07_lcd_drv_pin_config_use_devicetree/lcd_drv.c

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+#include <linux/module.h>
+#include <linux/kernel.h>
+#include <linux/err.h>
+#include <linux/errno.h>
+#include <linux/string.h>
+#include <linux/mm.h>
+#include <linux/slab.h>
+#include <linux/delay.h>
+#include <linux/fb.h>
+#include <linux/init.h>
+#include <linux/dma-mapping.h>
+#include <linux/interrupt.h>
+#include <linux/platform_device.h>
+#include <linux/clk.h>
+#include <linux/cpufreq.h>
+#include <linux/io.h>
+
+#include <asm/div64.h>
+
+#include <asm/mach/map.h>
+
+struct lcd_regs {
+	volatile unsigned int fb_base_phys;
+	volatile unsigned int fb_xres;
+	volatile unsigned int fb_yres;
+	volatile unsigned int fb_bpp;	
+};
+
+static struct lcd_regs *mylcd_regs;
+
+static struct fb_info *myfb_info;
+
+static unsigned int pseudo_palette[16];
+
+static struct gpio_desc *bl_gpio;
+
+
+/* from pxafb.c */
+static inline unsigned int chan_to_field(unsigned int chan,
+					 struct fb_bitfield *bf)
+{
+	chan &= 0xffff;
+	chan >>= 16 - bf->length;
+	return chan << bf->offset;
+}
+
+static int mylcd_setcolreg(unsigned regno,
+			       unsigned red, unsigned green, unsigned blue,
+			       unsigned transp, struct fb_info *info)
+{
+	unsigned int val;
+
+	/* dprintk("setcol: regno=%d, rgb=%d,%d,%d\n",
+		   regno, red, green, blue); */
+
+	switch (info->fix.visual) {
+	case FB_VISUAL_TRUECOLOR:
+		/* true-colour, use pseudo-palette */
+
+		if (regno < 16) {
+			u32 *pal = info->pseudo_palette;
+
+			val  = chan_to_field(red,   &info->var.red);
+			val |= chan_to_field(green, &info->var.green);
+			val |= chan_to_field(blue,  &info->var.blue);
+
+			pal[regno] = val;
+		}
+		break;
+
+	default:
+		return 1;	/* unknown type */
+	}
+
+	return 0;
+}
+
+
+static struct fb_ops myfb_ops = {
+	.owner		= THIS_MODULE,
+	.fb_setcolreg	= mylcd_setcolreg,
+	.fb_fillrect	= cfb_fillrect,
+	.fb_copyarea	= cfb_copyarea,
+	.fb_imageblit	= cfb_imageblit,
+};
+
+static int mylcd_probe(struct platform_device *pdev)
+{
+	dma_addr_t phy_addr;
+
+	/* get gpio from device tree */
+	bl_gpio = gpiod_get(&pdev->dev, "backlight", 0);
+
+	/* config bl_gpio as output */
+	gpiod_direction_output(bl_gpio, 1);
+
+	/* set val: gpiod_set_value(bl_gpio, status); */
+	
+	/* 1.1 分配fb_info */
+	myfb_info = framebuffer_alloc(0, NULL);
+
+	/* 1.2 设置fb_info */
+	/* a. var : LCD分辨率、颜色格式 */
+	myfb_info->var.xres_virtual = myfb_info->var.xres = 500;
+	myfb_info->var.yres_virtual = myfb_info->var.yres = 300;
+	
+	myfb_info->var.bits_per_pixel = 16;  /* rgb565 */
+	myfb_info->var.red.offset = 11;
+	myfb_info->var.red.length = 5;
+
+	myfb_info->var.green.offset = 5;
+	myfb_info->var.green.length = 6;
+
+	myfb_info->var.blue.offset = 0;
+	myfb_info->var.blue.length = 5;
+	
+
+	/* b. fix */
+	strcpy(myfb_info->fix.id, "100ask_lcd");
+	myfb_info->fix.smem_len = myfb_info->var.xres * myfb_info->var.yres * myfb_info->var.bits_per_pixel / 8;
+	if (myfb_info->var.bits_per_pixel == 24)
+		myfb_info->fix.smem_len = myfb_info->var.xres * myfb_info->var.yres * 4;
+
+
+	/* fb的虚拟地址 */
+	myfb_info->screen_base = dma_alloc_wc(NULL, myfb_info->fix.smem_len, &phy_addr,
+					 GFP_KERNEL);
+	myfb_info->fix.smem_start = phy_addr;  /* fb的物理地址 */
+	
+	myfb_info->fix.type = FB_TYPE_PACKED_PIXELS;
+	myfb_info->fix.visual = FB_VISUAL_TRUECOLOR;
+
+	myfb_info->fix.line_length = myfb_info->var.xres * myfb_info->var.bits_per_pixel / 8;
+	if (myfb_info->var.bits_per_pixel == 24)
+		myfb_info->fix.line_length = myfb_info->var.xres * 4;
+	
+
+	/* c. fbops */
+	myfb_info->fbops = &myfb_ops;
+	myfb_info->pseudo_palette = pseudo_palette;
+
+
+	/* 1.3 注册fb_info */
+	register_framebuffer(myfb_info);
+
+	/* 1.4 硬件操作 */
+	mylcd_regs = ioremap(0x021C8000, sizeof(struct lcd_regs));
+	mylcd_regs->fb_base_phys = phy_addr;
+	mylcd_regs->fb_xres = 500;
+	mylcd_regs->fb_yres = 300;
+	mylcd_regs->fb_bpp  = 16;
+
+	return 0;
+}
+
+
+static int mylcd_remove(struct platform_device *pdev)
+{
+	/* 反过来操作 */
+	/* 2.1 反注册fb_info */
+	unregister_framebuffer(myfb_info);
+
+	/* 2.2 释放fb_info */
+	framebuffer_release(myfb_info);
+	
+	iounmap(mylcd_regs);
+
+	return 0;
+}
+
+
+static const struct of_device_id mylcd_of_match[] = {
+	{ .compatible = "100ask,lcd_drv", },
+	{ },
+};
+MODULE_DEVICE_TABLE(of, simplefb_of_match);
+
+static struct platform_driver mylcd_driver = {
+	.driver = {
+		.name = "mylcd",
+		.of_match_table = mylcd_of_match,
+	},
+	.probe = mylcd_probe,
+	.remove = mylcd_remove,
+};
+
+static int __init lcd_drv_init(void)
+{
+	int ret;
+	struct device_node *np;
+
+	ret = platform_driver_register(&mylcd_driver);
+	if (ret)
+		return ret;
+
+	return 0;
+}
+
+/* 2. 出口 */
+static void __exit lcd_drv_exit(void)
+{
+	platform_driver_unregister(&mylcd_driver);
+}
+
+
+module_init(lcd_drv_init);
+module_exit(lcd_drv_exit);
+
+MODULE_AUTHOR("www.100ask.net");
+MODULE_DESCRIPTION("Framebuffer driver for the linux");
+MODULE_LICENSE("GPL");
+

STM32MP157/source/A7/03_LCD/07_lcd_drv_pin_config_use_devicetree/stm32mp157c-100ask-512d-lcd-v1.dts

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+// SPDX-License-Identifier: (GPL-2.0+ OR BSD-3-Clause)
+/*
+* Copyright (C) 100ASK 2020 - All Rights Reserved
+* Author: 100ask
+* support: weidongshan@qq.com 
+*/
+
+/dts-v1/;
+
+#include "stm32mp157c-100ask-512d-v1.dts"
+
+/ {
+        model = "100ASK YA157C v2 www.100ask.com";
+        compatible = "st,stm32mp157c-100ask-512d-v1", "st,stm32mp157";
+		
+
+	framebuffer-mylcd {
+			compatible = "100ask,lcd_drv";
+			pinctrl-names = "default";
+			pinctrl-0 = <&ltdc_pins_a>;
+			backlight-gpios = <&gpioe 11 GPIO_ACTIVE_HIGH>;
+	};
+		
+		
+	/*LCD Panel*/
+	panel {
+		compatible = "myir,070tft";
+        	interrupts = <11 IRQ_TYPE_EDGE_FALLING>;
+        	interrupt-parent = <&gpioe>;
+        	pinctrl-names = "default", "sleep";
+        	pinctrl-0 = <&ltdc_pins_a>;
+        	pinctrl-1 = <&ltdc_pins_sleep_a>;
+        	//reset-gpios = <&gpioe 12 GPIO_ACTIVE_LOW>;
+
+		backlight = <&panel_backlight>;
+       	 	status = "okay";
+		
+		port {
+			panel_in: endpoint {
+				remote-endpoint = <&ltdc_ep0_out>;			
+			};
+	
+		};
+	};
+};
+
+&spi5 {
+        pinctrl-names = "default", "sleep";
+        pinctrl-0 = <&spi5_pins_a>;
+        pinctrl-1 = <&spi5_sleep_pins_a>;
+        status = "okay";
+        cs-gpios = <&gpioh 5 GPIO_ACTIVE_LOW>;
+        spidev: icm20608@0{
+                compatible = "invensense,icm20608";
+                interrupts = <0 IRQ_TYPE_EDGE_FALLING>;
+                interrupt-parent = <&gpioz>;
+                spi-max-frequency = <8000000>;
+                reg = <0>;
+        };
+};
+
+/* test HDMI*/
+&ltdc {
+    status = "okay";
+    port {
+       #address-cells = <1>;
+       #size-cells = <0>;
+
+	ltdc_ep1_out: endpoint@1 {
+       		reg = <1>;
+        	remote-endpoint = <&sii9022_in>;
+        };
+   };
+};
+
+
+/*HDMI*/
+&i2c4 {
+        clock-frequency = <100000>;
+       hdmi-transmitter@40 { // use a dummy device
+                compatible = "sil,sii9022";
+                reg = <0x40>;
+                reset-gpios = <&gpiob 10 GPIO_ACTIVE_LOW>;
+                interrupts = <13 IRQ_TYPE_EDGE_FALLING>;
+                interrupt-parent = <&gpiob>;
+                //pinctrl-names = "default", "sleep";
+                //pinctrl-0 = <&ltdc_pins_a>;
+                //pinctrl-1 = <&ltdc_pins_sleep_a>;
+                status = "disabled";
+
+                ports {
+                        #address-cells = <1>;
+                        #size-cells = <0>;
+
+                        port@0 {
+                                reg = <0>;
+                                sii9022_in: endpoint {
+                                        remote-endpoint = <&ltdc_ep1_out>;
+                                };
+                        };
+
+                };
+        };
+
+#if 1
+	sii902x: sii902x@39 {
+              compatible = "SiI,sii902x";
+              reset-gpios = <&gpiob 10 GPIO_ACTIVE_LOW>;
+              //pinctrl-names = "default";
+              //pinctrl-0 = <&pinctrl_sii902x>;
+              interrupts = <13 IRQ_TYPE_EDGE_FALLING>;
+              interrupt-parent = <&gpiob>;
+              mode_str ="1280x720M@60";
+              bits-per-pixel = <16>;
+              reg = <0x39>;
+              status = "okay";
+
+	};
+#endif
+};
+
+&i2s2 {
+	status = "disable";
+
+};
+
+/*test LCD*/
+&ltdc {
+        status = "okay";
+
+        port {
+                #address-cells = <1>;
+                #size-cells = <0>;
+
+                ltdc_ep0_out: endpoint@0 {
+                                reg = <0>;
+                                remote-endpoint = <&panel_in>;
+                                };
+           };
+};
+
+