media: ti: Add CSI2RX support for J721E

TI's J721E uses the Cadence CSI2RX and DPHY peripherals to facilitate
capture over a CSI-2 bus.

The Cadence CSI2RX IP acts as a bridge between the TI specific parts and
the CSI-2 protocol parts. TI then has a wrapper on top of this bridge
called the SHIM layer. It takes in data from stream 0, repacks it, and
sends it to memory over PSI-L DMA.

This driver acts as the "front end" to V4L2 client applications. It
implements the required ioctls and buffer operations, passes the
necessary calls on to the bridge, programs the SHIM layer, and performs
DMA via the dmaengine API to finally return the data to a buffer
supplied by the application.
Co-developed-by: Pratyush Yadav <p.yadav@ti.com>
Signed-off-by: Pratyush Yadav <p.yadav@ti.com>
Co-developed-by: Vaishnav Achath <vaishnav.a@ti.com>
Signed-off-by: Vaishnav Achath <vaishnav.a@ti.com>
Tested-by: Vaishnav Achath <vaishnav.a@ti.com>
Tested-by: Julien Massot <julien.massot@collabora.com>
Reviewed-by: Tomi Valkeinen <tomi.valkeinen@ideasonboard.com>
Signed-off-by: Jai Luthra <j-luthra@ti.com>
Signed-off-by: Sakari Ailus <sakari.ailus@linux.intel.com>
Signed-off-by: Hans Verkuil <hverkuil-cisco@xs4all.nl>

MAINTAINERS

@@ -21594,6 +21594,13 @@ F:	Documentation/devicetree/bindings/media/i2c/ti,ds90*
 F:	drivers/media/i2c/ds90*
 F:	include/media/i2c/ds90*
 
+TI J721E CSI2RX DRIVER
+M:	Jai Luthra <j-luthra@ti.com>
+L:	linux-media@vger.kernel.org
+S:	Maintained
+F:	Documentation/devicetree/bindings/media/ti,j721e-csi2rx.yaml
+F:	drivers/media/platform/ti/j721e-csi2rx/
+
 TI KEYSTONE MULTICORE NAVIGATOR DRIVERS
 M:	Nishanth Menon <nm@ti.com>
 M:	Santosh Shilimkar <ssantosh@kernel.org>

drivers/media/platform/ti/Kconfig

@@ -63,6 +63,18 @@ config VIDEO_TI_VPE_DEBUG
 	help
 	  Enable debug messages on VPE driver.
 
+config VIDEO_TI_J721E_CSI2RX
+	tristate "TI J721E CSI2RX wrapper layer driver"
+	depends on VIDEO_DEV && VIDEO_V4L2_SUBDEV_API
+	depends on MEDIA_SUPPORT && MEDIA_CONTROLLER
+	depends on (PHY_CADENCE_DPHY_RX && VIDEO_CADENCE_CSI2RX) || COMPILE_TEST
+	depends on ARCH_K3 || COMPILE_TEST
+	select VIDEOBUF2_DMA_CONTIG
+	select V4L2_FWNODE
+	help
+	  Support for TI CSI2RX wrapper layer. This just enables the wrapper driver.
+	  The Cadence CSI2RX bridge driver needs to be enabled separately.
+
 source "drivers/media/platform/ti/am437x/Kconfig"
 source "drivers/media/platform/ti/davinci/Kconfig"
 source "drivers/media/platform/ti/omap/Kconfig"

drivers/media/platform/ti/Makefile

@@ -3,5 +3,6 @@ obj-y += am437x/
 obj-y += cal/
 obj-y += vpe/
 obj-y += davinci/
+obj-y += j721e-csi2rx/
 obj-y += omap/
 obj-y += omap3isp/

drivers/media/platform/ti/j721e-csi2rx/Makefile

+# SPDX-License-Identifier: GPL-2.0
+obj-$(CONFIG_VIDEO_TI_J721E_CSI2RX) += j721e-csi2rx.o