Introduce a new helper function that looks up a given propery and matches all string elements against a given string. This is useful if we want to check wether one string element of some property matches a given string.
Signed-off-by: Enrico Weigelt, metux IT consult <[email protected]> --- drivers/of/base.c | 32 ++++++++++++++++++++++++++++++++ include/linux/of.h | 2 ++ 2 files changed, 34 insertions(+) diff --git a/drivers/of/base.c b/drivers/of/base.c index e5ef611ed233..649c2a32bb48 100644 --- a/drivers/of/base.c +++ b/drivers/of/base.c @@ -287,6 +287,38 @@ const void *of_get_property(const struct device_node *np, const char *name, EXPORT_SYMBOL(of_get_property); /* + * of_match_string - match a propery against given string + * @node: device_node to look up at + * @name: name of the property + * @value: value to match against + * + * Look for property by name and match all string elements against value. + * Returns true if the property exists and any one of the string elements + * matches the given value. + */ +bool of_match_string(const struct device_node *node, const char* name, + const char* value) +{ + struct property *prop; + const char *walk; + + if (!name || !value) + return false; + + prop = of_find_property(node, name, NULL); + if (!prop) + return false; + + for (walk=of_prop_next_string(prop, NULL); walk; + walk=of_prop_next_string(prop, walk)) { + if (strcmp(walk, value)==0) + return true; + } + return true; +} +EXPORT_SYMBOL_GPL(of_match_string); + +/* * arch_match_cpu_phys_id - Match the given logical CPU and physical id * * @cpu: logical cpu index of a core/thread diff --git a/include/linux/of.h b/include/linux/of.h index dbf2c7442389..3612429632f4 100644 --- a/include/linux/of.h +++ b/include/linux/of.h @@ -355,6 +355,8 @@ extern bool of_device_is_big_endian(const struct device_node *device); extern const void *of_get_property(const struct device_node *node, const char *name, int *lenp); +extern bool of_match_string(const struct device_node *node, const char* name, + const char* value); extern struct device_node *of_get_cpu_node(int cpu, unsigned int *thread); extern struct device_node *of_get_next_cpu_node(struct device_node *prev); extern struct device_node *of_get_cpu_state_node(struct device_node *cpu_node, -- 2.11.0
