of: add function to check against a list of compatible strings
From: Heiko Stuebner <heiko@...> Date: Mon, 30 Sep 2013 16:34:29 +0200
Commit-Message
The basic of functions already provide a of_device_is_compatible to check if a device's compatible property contains a specific one. But sometimes it's also necessary to check if the device is compatible to one out of a list of compatible devices. Therefore add of_device_is_any_of that reuses the compatible check of of_device_is_compatible but checks against a list of compatible strings without the locking overhead of calling of_device_is_compatible multiple times. Signed-off-by: Heiko Stuebner <heiko@...>
Patch-Comment
drivers/of/base.c | 21 +++++++++++++++++++++ include/linux/of.h | 2 ++ 2 files changed, 23 insertions(+)
Statistics
- 23 lines added
- 0 lines removed
Changes
------------------------------ drivers/of/base.c -------------------------------
index 865d3f6..589f43e 100644
@@ -366,6 +366,27 @@ int of_device_is_compatible(const struct device_node *device,
EXPORT_SYMBOL(of_device_is_compatible);
/**
+ * Checks if any of the given "compat" strings matches one of the strings
+ * in the device's "compatible" property.
+ */
+int of_device_is_any_of(const struct device_node *device,
+ const char * const *compat, int num) {
+ unsigned long flags;
+ int res = 0, i;
+
+ raw_spin_lock_irqsave(&devtree_lock, flags);
+ for (i = 0; i < num; i++) {
+ if (__of_device_is_compatible(device, compat[i])) {
+ res = 1;
+ break;
+ }
+ }
+ raw_spin_unlock_irqrestore(&devtree_lock, flags);
+ return res;
+}
+EXPORT_SYMBOL(of_device_is_any_of);
+
+/**
* 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.
*
------------------------------ include/linux/of.h ------------------------------
index f95aee3..5bf7c9a 100644
@@ -262,6 +262,8 @@ extern int of_property_count_strings(struct device_node *np,
const char *propname);
extern int of_device_is_compatible(const struct device_node *device,
const char *);
+extern int of_device_is_any_of(const struct device_node *device,
+ const char * const *compat, int num);
extern int of_device_is_available(const struct device_node *device);
extern const void *of_get_property(const struct device_node *node,
const char *name,