[PATCH 1/3] device property: Add fwnode_is_compatible() and device_is_compatible() helpers

[Heikki Krogerus]

Since there are also some ACPI platforms where the
"compatible" property is used, introducing a generic helper
function fwnode_is_compatible() that can be used with
DT, ACPI and swnodes, and a wrapper function
device_is_compatible() with it.

The function calls of_device_is_comaptible() with OF nodes,
and with ACPI and swnodes it matches the given string
against the "compatible" string property array.

Signed-off-by: Heikki Krogerus <heikki.krogerus@xxxxxxxxxxxxxxx>
---
 drivers/base/property.c  | 35 +++++++++++++++++++++++++++++++++++
 include/linux/property.h |  3 +++
 2 files changed, 38 insertions(+)

diff --git a/drivers/base/property.c b/drivers/base/property.c
index 8b91ab380d14..af9f5aac5d02 100644
--- a/drivers/base/property.c
+++ b/drivers/base/property.c
@@ -1006,3 +1006,38 @@ const void *device_get_match_data(struct device *dev)
 	return fwnode_call_ptr_op(dev_fwnode(dev), device_get_match_data, dev);
 }
 EXPORT_SYMBOL_GPL(device_get_match_data);
+
+/**
+ * fwnode_is_compatible - Check does fwnode have the given compatible string
+ * @fwnode: fwnode with the "compatible" property
+ * @compat: The compatible string
+ *
+ * Match the compatible strings of @fwnode against @compat. Returns positive
+ * value on match, and 0 when no matching compatible string is found.
+ */
+int fwnode_is_compatible(struct fwnode_handle *fwnode, const char *compat)
+{
+	int ret;
+
+	if (is_of_node(fwnode))
+		return of_device_is_compatible(to_of_node(fwnode), compat);
+
+	ret = fwnode_property_match_string(fwnode, "compatible", compat);
+
+	return ret < 0 ? 0 : 1;
+}
+EXPORT_SYMBOL_GPL(fwnode_is_compatible);
+
+/**
+ * device_is_compatible - Check does a device have the given compatible string
+ * @dev: Device with the "compatible" property
+ * @compat: The compatible string
+ *
+ * Match the compatible strings of @dev against @compat. Returns positive value
+ * on match, and 0 when no matching compatible string is found.
+ */
+int device_is_compatible(struct device *dev, const char *compat)
+{
+	return fwnode_is_compatible(dev_fwnode(dev), compat);
+}
+EXPORT_SYMBOL_GPL(device_is_compatible);
diff --git a/include/linux/property.h b/include/linux/property.h
index 65d3420dd5d1..d22788ec36cd 100644
--- a/include/linux/property.h
+++ b/include/linux/property.h
@@ -311,6 +311,9 @@ fwnode_graph_get_remote_node(const struct fwnode_handle *fwnode, u32 port,
 int fwnode_graph_parse_endpoint(const struct fwnode_handle *fwnode,
 				struct fwnode_endpoint *endpoint);
 
+int fwnode_is_compatible(struct fwnode_handle *fwnode, const char *compat);
+int device_is_compatible(struct device *dev, const char *compat);
+
 /* -------------------------------------------------------------------------- */
 /* Software fwnode support - when HW description is incomplete or missing */
 
-- 
2.20.1