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dtc: Implement path references

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This patch extends dtc syntax to allow references (&label, or
&{/full/path}) directly within property definitions, rather than
inside a cell list.  Such references are expanded to the full path of
the referenced node, as a string, instead of to a phandle as
references within cell lists are evaluated.

A testcase is also included.

Signed-off-by: David Gibson <david@gibson.dropbear.id.au>
This commit is contained in:
David Gibson
2007-12-05 10:43:50 +11:00
committed by Jon Loeliger
parent 80c72a81cf
commit efbbef8e4f
8 changed files with 149 additions and 2 deletions
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83
tests/path-references.c Normal file
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/*
* libfdt - Flat Device Tree manipulation
* Testcase for string references in dtc
* Copyright (C) 2006 David Gibson, IBM Corporation.
*
* This library is free software; you can redistribute it and/or
* modify it under the terms of the GNU Lesser General Public License
* as published by the Free Software Foundation; either version 2.1 of
* the License, or (at your option) any later version.
*
* This library is distributed in the hope that it will be useful, but
* WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
* Lesser General Public License for more details.
*
* You should have received a copy of the GNU Lesser General Public
* License along with this library; if not, write to the Free Software
* Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
*/
#include <stdlib.h>
#include <stdio.h>
#include <string.h>
#include <stdint.h>
#include <fdt.h>
#include <libfdt.h>
#include "tests.h"
#include "testdata.h"
void check_ref(const void *fdt, int node, const char *checkpath)
{
const char *p;
int len;
p = fdt_getprop(fdt, node, "ref", &len);
if (!p)
FAIL("fdt_getprop(%d, \"ref\"): %s", node, fdt_strerror(len));
if (!streq(p, checkpath))
FAIL("'ref' in node at %d has value \"%s\" instead of \"%s\"",
node, p, checkpath);
p = fdt_getprop(fdt, node, "lref", &len);
if (!p)
FAIL("fdt_getprop(%d, \"lref\"): %s", node, fdt_strerror(len));
if (!streq(p, checkpath))
FAIL("'lref' in node at %d has value \"%s\" instead of \"%s\"",
node, p, checkpath);
}
int main(int argc, char *argv[])
{
void *fdt;
const char *p;
int len, multilen;
int n1, n2;
test_init(argc, argv);
fdt = load_blob_arg(argc, argv);
n1 = fdt_path_offset(fdt, "/node1");
if (n1 < 0)
FAIL("fdt_path_offset(/node1): %s", fdt_strerror(n1));
n2 = fdt_path_offset(fdt, "/node2");
if (n2 < 0)
FAIL("fdt_path_offset(/node2): %s", fdt_strerror(n2));
check_ref(fdt, n1, "/node2");
check_ref(fdt, n2, "/node1");
/* Check multiple reference */
multilen = strlen("/node1") + strlen("/node2") + 2;
p = fdt_getprop(fdt, 0, "multiref", &len);
if (!p)
FAIL("fdt_getprop(0, \"multiref\"): %s", fdt_strerror(len));
if (len != multilen)
FAIL("multiref has wrong length, %d instead of %d",
len, multilen);
if ((!streq(p, "/node1") || !streq(p + strlen("/node1") + 1, "/node2")))
FAIL("multiref has wrong value");
PASS();
}