soc-camera: add board hook to specify the buswidth for camera sensors

From: Sascha Hauer <s.hauer@pengutronix.de>

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>
---
 include/media/soc_camera.h |    7 +++++++
 1 files changed, 7 insertions(+), 0 deletions(-)

1 files changed, 7 insertions, 0 deletions

diff --git a/linux/include/media/soc_camera.h b/linux/include/media/soc_camera.h
index 013c81875..b44fa0952 100644
--- a/linux/include/media/soc_camera.h
+++ b/linux/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)