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libfdt: Add functions for handling the "compatible" property

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This patch adds functions for dealing with the compatible property.
fdt_node_check_compatible() can be used to determine whether a node is
compatible with a given string and fdt_node_offset_by_compatible()
locates nodes with a given compatible string.

Testcases for these functions are also included.

Signed-off-by: David Gibson <david@gibson.dropbear.id.au>
This commit is contained in:
David Gibson 2007-10-16 13:58:25 +10:00 • committed by Jon Loeliger
parent 121acdec91
commit 333542fabf
9 changed files with 199 additions and 1 deletions
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86
tests/node_offset_by_compatible.c Normal file
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/*
* libfdt - Flat Device Tree manipulation
* Testcase for fdt_node_offset_by_compatible()
* 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 <stdarg.h>
#include <fdt.h>
#include <libfdt.h>
#include "tests.h"
#include "testdata.h"
void check_search(void *fdt, const char *compat, ...)
{
va_list ap;
int offset = -1, target;
va_start(ap, compat);
do {
target = va_arg(ap, int);
verbose_printf("Searching (target = %d): %d ->",
target, offset);
offset = fdt_node_offset_by_compatible(fdt, offset, compat);
verbose_printf("%d\n", offset);
if (offset != target)
FAIL("fdt_node_offset_by_compatible(%s) returns %d "
"instead of %d", compat, offset, target);
} while (target >= 0);
va_end(ap);
}
int main(int argc, char *argv[])
{
void *fdt;
int subnode1_offset, subnode2_offset;
int subsubnode1_offset, subsubnode2_offset;
test_init(argc, argv);
fdt = load_blob_arg(argc, argv);
subnode1_offset = fdt_path_offset(fdt, "/subnode@1");
subnode2_offset = fdt_path_offset(fdt, "/subnode@2");
subsubnode1_offset = fdt_path_offset(fdt, "/subnode@1/subsubnode");
subsubnode2_offset = fdt_path_offset(fdt, "/subnode@2/subsubnode@0");
if ((subnode1_offset < 0) || (subnode2_offset < 0)
|| (subsubnode1_offset < 0) || (subsubnode2_offset < 0))
FAIL("Can't find required nodes");
check_search(fdt, "test_tree1", 0, -FDT_ERR_NOTFOUND);
check_search(fdt, "subnode1", subnode1_offset, -FDT_ERR_NOTFOUND);
check_search(fdt, "subsubnode1", subsubnode1_offset, -FDT_ERR_NOTFOUND);
check_search(fdt, "subsubnode2", subsubnode2_offset, -FDT_ERR_NOTFOUND);
/* Eek.. HACK to make this work whatever the order in the
* example tree */
if (subsubnode1_offset < subsubnode2_offset)
check_search(fdt, "subsubnode", subsubnode1_offset,
subsubnode2_offset, -FDT_ERR_NOTFOUND);
else
check_search(fdt, "subsubnode", subsubnode2_offset,
subsubnode1_offset, -FDT_ERR_NOTFOUND);
check_search(fdt, "nothing-like-this", -FDT_ERR_NOTFOUND);
PASS();
}