media: v4l: cadence: Add Cadence MIPI-CSI2 TX driver

The Cadence MIPI-CSI2 TX controller is an hardware block meant to be used
as a bridge between pixel interfaces and a CSI-2 bus.

It supports operating with an internal or external D-PHY, with up to 4
lanes, or without any D-PHY. The current code only supports the latter
case.

While the virtual channel input on the pixel interface can be directly
mapped to CSI2, the datatype input is actually a selection signal (3-bits)
mapping to a table of up to 8 preconfigured datatypes/formats (programmed
at start-up)

The block supports up to 8 input datatypes.

Acked-by: Benoit Parrot <bparrot@ti.com>
Reviewed-by: Niklas Söderlund <niklas.soderlund+renesas@ragnatech.se>
Signed-off-by: Maxime Ripard <maxime.ripard@bootlin.com>
Signed-off-by: Sakari Ailus <sakari.ailus@linux.intel.com>
Signed-off-by: Mauro Carvalho Chehab <mchehab+samsung@kernel.org>

drivers/media/platform/cadence/Kconfig

@@ -20,4 +20,15 @@ config VIDEO_CADENCE_CSI2RX
 	  To compile this driver as a module, choose M here: the module will be
 	  called cdns-csi2rx.
 
+config VIDEO_CADENCE_CSI2TX
+	tristate "Cadence MIPI-CSI2 TX Controller"
+	depends on MEDIA_CONTROLLER
+	depends on VIDEO_V4L2_SUBDEV_API
+	select V4L2_FWNODE
+	help
+	  Support for the Cadence MIPI CSI2 Transceiver controller.
+
+	  To compile this driver as a module, choose M here: the module will be
+	  called cdns-csi2tx.
+
 endif

drivers/media/platform/cadence/Makefile

@@ -1,3 +1,4 @@
 # SPDX-License-Identifier: GPL-2.0
 
 obj-$(CONFIG_VIDEO_CADENCE_CSI2RX)	+= cdns-csi2rx.o
+obj-$(CONFIG_VIDEO_CADENCE_CSI2TX)	+= cdns-csi2tx.o