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of/flattree: Add of_flat_dt_match() helper function

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This patch adds of_flat_dt_match() which tests a node for
compatibility with a list of values and converts the relevant powerpc
platform code to use it.  This approach simplifies the board support
code a bit.

Signed-off-by: Grant Likely <grant.likely@secretlab.ca>
Reviewed-by: Stephen Neuendorffer <stephen.neuendorffer@xilinx.com>
This commit is contained in:
Grant Likely
2010-10-30 11:49:09 -04:00
parent 73930a85cf
commit a4f740cf33
11 changed files with 89 additions and 78 deletions
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37
drivers/of/fdt.c
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@@ -78,19 +78,23 @@ void *of_fdt_get_property(struct boot_param_header *blob,
* @blob: A device tree blob
* @node: node to test
* @compat: compatible string to compare with compatible list.
*
* On match, returns a non-zero value with smaller values returned for more
* specific compatible values.
*/
int of_fdt_is_compatible(struct boot_param_header *blob,
unsigned long node, const char *compat)
{
const char *cp;
unsigned long cplen, l;
unsigned long cplen, l, score = 0;
cp = of_fdt_get_property(blob, node, "compatible", &cplen);
if (cp == NULL)
return 0;
while (cplen > 0) {
score++;
if (of_compat_cmp(cp, compat, strlen(compat)) == 0)
return 1;
return score;
l = strlen(cp) + 1;
cp += l;
cplen -= l;
@@ -99,6 +103,27 @@ int of_fdt_is_compatible(struct boot_param_header *blob,
return 0;
}
/**
* of_fdt_match - Return true if node matches a list of compatible values
*/
int of_fdt_match(struct boot_param_header *blob, unsigned long node,
const char **compat)
{
unsigned int tmp, score = 0;
if (!compat)
return 0;
while (*compat) {
tmp = of_fdt_is_compatible(blob, node, *compat);
if (tmp && (score == 0 || (tmp < score)))
score = tmp;
compat++;
}
return score;
}
static void *unflatten_dt_alloc(unsigned long *mem, unsigned long size,
unsigned long align)
{
@@ -511,6 +536,14 @@ int __init of_flat_dt_is_compatible(unsigned long node, const char *compat)
return of_fdt_is_compatible(initial_boot_params, node, compat);
}
/**
* of_flat_dt_match - Return true if node matches a list of compatible values
*/
int __init of_flat_dt_match(unsigned long node, const char **compat)
{
return of_fdt_match(initial_boot_params, node, compat);
}
#ifdef CONFIG_BLK_DEV_INITRD
/**
* early_init_dt_check_for_initrd - Decode initrd location from flat tree