V4L/DVB (11030): soc-camera: add board hook to specify the buswidth for camera sensors

Camera sensors have a native bus width say support, but on some
boards not all sensor data lines are connected to the image
interface and thus support a different bus width than the sensors
native one. Some boards even have a bus driver which dynamically
switches between different bus widths with a GPIO.

This patch adds a hook which board code can use to support different
bus widths.
Signed-off-by: Sascha Hauer <s.hauer@pengutronix.de>
Signed-off-by: Guennadi Liakhovetski <g.liakhovetski@gmx.de>
Signed-off-by: Mauro Carvalho Chehab <mchehab@redhat.com>

include/media/soc_camera.h

@@ -102,6 +102,13 @@ struct soc_camera_link {
 	/* Optional callbacks to power on or off and reset the sensor */
 	int (*power)(struct device *, int);
 	int (*reset)(struct device *);
+	/*
+	 * some platforms may support different data widths than the sensors
+	 * native ones due to different data line routing. Let the board code
+	 * overwrite the width flags.
+	 */
+	int (*set_bus_param)(struct soc_camera_link *, unsigned long flags);
+	unsigned long (*query_bus_param)(struct soc_camera_link *);
 };
 
 static inline struct soc_camera_device *to_soc_camera_dev(struct device *dev)