media: v4l: fwnode: Add convenience function for parsing common external refs

Add v4l2_fwnode_parse_reference_sensor_common for parsing common
sensor properties that refer to adjacent devices such as flash or lens
driver chips.

As this is an association only, there's little a regular driver needs to
know about these devices as such.

Signed-off-by: Sakari Ailus <sakari.ailus@linux.intel.com>
Acked-by: Hans Verkuil <hans.verkuil@cisco.com>
Acked-by: Pavel Machek <pavel@ucw.cz>
Reviewed-by: Sebastian Reichel <sebastian.reichel@collabora.co.uk>
Signed-off-by: Mauro Carvalho Chehab <mchehab@s-opensource.com>

1 files changed, 35 insertions, 0 deletions

diff --git a/drivers/media/v4l2-core/v4l2-fwnode.c b/drivers/media/v4l2-core/v4l2-fwnode.c
index f8cd88f..39387dc6 100644
--- a/drivers/media/v4l2-core/v4l2-fwnode.c
+++ b/drivers/media/v4l2-core/v4l2-fwnode.c
@@ -865,6 +865,41 @@ error:
 	return ret;
 }
 
+int v4l2_async_notifier_parse_fwnode_sensor_common(
+	struct device *dev, struct v4l2_async_notifier *notifier)
+{
+	static const char * const led_props[] = { "led" };
+	static const struct {
+		const char *name;
+		const char * const *props;
+		unsigned int nprops;
+	} props[] = {
+		{ "flash-leds", led_props, ARRAY_SIZE(led_props) },
+		{ "lens-focus", NULL, 0 },
+	};
+	unsigned int i;
+
+	for (i = 0; i < ARRAY_SIZE(props); i++) {
+		int ret;
+
+		if (props[i].props && is_acpi_node(dev_fwnode(dev)))
+			ret = v4l2_fwnode_reference_parse_int_props(
+				dev, notifier, props[i].name,
+				props[i].props, props[i].nprops);
+		else
+			ret = v4l2_fwnode_reference_parse(
+				dev, notifier, props[i].name);
+		if (ret && ret != -ENOENT) {
+			dev_warn(dev, "parsing property \"%s\" failed (%d)\n",
+				 props[i].name, ret);
+			return ret;
+		}
+	}
+
+	return 0;
+}
+EXPORT_SYMBOL_GPL(v4l2_async_notifier_parse_fwnode_sensor_common);
+
 MODULE_LICENSE("GPL");
 MODULE_AUTHOR("Sakari Ailus <sakari.ailus@linux.intel.com>");
 MODULE_AUTHOR("Sylwester Nawrocki <s.nawrocki@samsung.com>");