dt: Add of_device_compatible_match()

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>

diff --git a/drivers/of/base.c b/drivers/of/base.c
index ebf84e3..c382e1f 100644 (file)
--- a/drivers/of/base.c
+++ b/drivers/of/base.c
@@ -493,6 +493,28 @@ int of_device_is_compatible(const struct device_node *device,
 }
 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
  * @compat: compatible string to look for in root node's compatible property.

diff --git a/include/linux/of.h b/include/linux/of.h
index 74eb28c..33c184d 100644 (file)
--- a/include/linux/of.h
+++ b/include/linux/of.h
@@ -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);
 extern int of_device_is_compatible(const struct device_node *device,
                                   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_big_endian(const struct device_node *device);
 extern const void *of_get_property(const struct device_node *node,