drm/bridge: imx: Add i.MX8qm/qxp display pixel link support

This patch adds a drm bridge driver for i.MX8qm/qxp display pixel link.
The pixel link forms a standard asynchronous linkage between
pixel sources(display controller or camera module) and pixel
consumers(imaging or displays).  It consists of two distinct
functions, a pixel transfer function and a control interface.
Reviewed-by: Robert Foss <robert.foss@linaro.org>
Tested-by: Marcel Ziswiler <marcel.ziswiler@toradex.com> # Colibri iMX8X, LT170410-2WHC, LP156WF1
Signed-off-by: Liu Ying <victor.liu@nxp.com>
Acked-by: Sakari Ailus <sakari.ailus@linux.intel.com>
Signed-off-by: Robert Foss <robert.foss@linaro.org>
Link: https://patchwork.freedesktop.org/patch/msgid/20220611141421.718743-7-victor.liu@nxp.com

drivers/gpu/drm/bridge/imx/Kconfig

@@ -6,3 +6,12 @@ config DRM_IMX8QXP_PIXEL_COMBINER
 	help
 	  Choose this to enable pixel combiner found in
 	  Freescale i.MX8qm/qxp processors.
+
+config DRM_IMX8QXP_PIXEL_LINK
+	tristate "Freescale i.MX8QM/QXP display pixel link"
+	depends on OF
+	depends on IMX_SCU
+	select DRM_KMS_HELPER
+	help
+	  Choose this to enable display pixel link found in
+	  Freescale i.MX8qm/qxp processors.

drivers/gpu/drm/bridge/imx/Makefile

 obj-$(CONFIG_DRM_IMX8QXP_PIXEL_COMBINER) += imx8qxp-pixel-combiner.o
+obj-$(CONFIG_DRM_IMX8QXP_PIXEL_LINK) += imx8qxp-pixel-link.o