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dt: Add of_device_compatible_match()

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This provides an equivalent of of_fdt_match() for non-flat trees.

This is more practical than matching an array of of_device_id structs
when converting a bunch of existing users of of_fdt_match().

Signed-off-by: Benjamin Herrenschmidt <benh@kernel.crashing.org>
Acked-by: Rob Herring <robh@kernel.org>
Signed-off-by: Michael Ellerman <mpe@ellerman.id.au>
This commit is contained in:
Benjamin Herrenschmidt 2016-07-08 08:35:59 +10:00 committed by Michael Ellerman
parent e2413a7dae
commit b9c13fe32f
2 changed files with 24 additions and 0 deletions
repo.diff.show_diff_stats Download patch file Download diff file Expand all files Collapse all files

22
drivers/of/base.c
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@ -493,6 +493,28 @@ int of_device_is_compatible(const struct device_node *device,
} }
EXPORT_SYMBOL(of_device_is_compatible); EXPORT_SYMBOL(of_device_is_compatible);
/** Checks if the device is compatible with any of the entries in
* a NULL terminated array of strings. Returns the best match
* score or 0.
*/
int of_device_compatible_match(struct device_node *device,
const char *const *compat)
{
unsigned int tmp, score = 0;
if (!compat)
return 0;
while (*compat) {
tmp = of_device_is_compatible(device, *compat);
if (tmp > score)
score = tmp;
compat++;
}
return score;
}
/** /**
* of_machine_is_compatible - Test root of device tree for a given compatible value * of_machine_is_compatible - Test root of device tree for a given compatible value
* @compat: compatible string to look for in root node's compatible property. * @compat: compatible string to look for in root node's compatible property.

2
include/linux/of.h
View file

@ -324,6 +324,8 @@ extern int of_property_read_string_helper(const struct device_node *np,
const char **out_strs, size_t sz, int index); const char **out_strs, size_t sz, int index);
extern int of_device_is_compatible(const struct device_node *device, extern int of_device_is_compatible(const struct device_node *device,
const char *); const char *);
extern int of_device_compatible_match(struct device_node *device,
const char *const *compat);
extern bool of_device_is_available(const struct device_node *device); extern bool of_device_is_available(const struct device_node *device);
extern bool of_device_is_big_endian(const struct device_node *device); extern bool of_device_is_big_endian(const struct device_node *device);
extern const void *of_get_property(const struct device_node *node, extern const void *of_get_property(const struct device_node *node,