device property: Add fwnode_name_eq()

Add fwnode_name_eq() to implement the functionality of of_node_name_eq()
on fwnode property API. The same convention of ending the comparison at
'@' (besides NUL) is applied on also both ACPI and swnode. The function
is intended for comparing unit address-less node names on DT and firmware
or swnodes compliant with DT bindings.

Reviewed-by: Laurent Pinchart <laurent.pinchart@ideasonboard.com>
Tested-by: Laurent Pinchart <laurent.pinchart@ideasonboard.com>
Acked-by: Rafael J. Wysocki <rafael@kernel.org>
Acked-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
Signed-off-by: Sakari Ailus <sakari.ailus@linux.intel.com>
Signed-off-by: Hans Verkuil <hverkuil-cisco@xs4all.nl>

diff --git a/drivers/base/property.c b/drivers/base/property.c
index 8c40abed785247b6262aac141d6f02f876a66835..b79608ee0b46be36bb74578de285797ad4da22e0 100644 (file)
--- a/drivers/base/property.c
+++ b/drivers/base/property.c
@@ -594,6 +594,34 @@ const char *fwnode_get_name_prefix(const struct fwnode_handle *fwnode)
        return fwnode_call_ptr_op(fwnode, get_name_prefix);
 }
 
+/**
+ * fwnode_name_eq - Return true if node name is equal
+ * @fwnode: The firmware node
+ * @name: The name to which to compare the node name
+ *
+ * Compare the name provided as an argument to the name of the node, stopping
+ * the comparison at either NUL or '@' character, whichever comes first. This
+ * function is generally used for comparing node names while ignoring the
+ * possible unit address of the node.
+ *
+ * Return: true if the node name matches with the name provided in the @name
+ * argument, false otherwise.
+ */
+bool fwnode_name_eq(const struct fwnode_handle *fwnode, const char *name)
+{
+       const char *node_name;
+       ptrdiff_t len;
+
+       node_name = fwnode_get_name(fwnode);
+       if (!node_name)
+               return false;
+
+       len = strchrnul(node_name, '@') - node_name;
+
+       return str_has_prefix(node_name, name) == len;
+}
+EXPORT_SYMBOL_GPL(fwnode_name_eq);
+
 /**
  * fwnode_get_parent - Return parent firwmare node
  * @fwnode: Firmware whose parent is retrieved

diff --git a/include/linux/property.h b/include/linux/property.h
index 9f2585d705a867ce2f7d35da322a1e9ee6292360..4ebbb169df2065a1fcfd0f45687a63601496239a 100644 (file)
--- a/include/linux/property.h
+++ b/include/linux/property.h
@@ -109,6 +109,7 @@ struct fwnode_handle *fwnode_find_reference(const struct fwnode_handle *fwnode,
 
 const char *fwnode_get_name(const struct fwnode_handle *fwnode);
 const char *fwnode_get_name_prefix(const struct fwnode_handle *fwnode);
+bool fwnode_name_eq(const struct fwnode_handle *fwnode, const char *name);
 
 struct fwnode_handle *fwnode_get_parent(const struct fwnode_handle *fwnode);
 struct fwnode_handle *fwnode_get_next_parent(struct fwnode_handle *fwnode);