media: staging: max96712: Add basic support for MAX96712 GMSL2 deseri…

…alizer

Add basic support for Maxim MAX96712 quad GMSL2 deserializers. The
driver is capable of powering on the device and configuring the MIPI
CSI-2 bus in a DPHY 4-lane configuration as well as operating the
internal VTG (Video Timing Generator) and VPG (Video Pattern Generator).

Using these features the driver is able to act as a 1080p @ 30 fps V4L2
video source. Producing either a checkerboard or gradient pattern on the
CSI-2 bus, selectable thru a V4L2 control.

While the driver is useful as-is and have been used to prove the correct
operation of the MAX96712 itself and "downstream" devices using the
MAX96712 as a video source there are a lot of features missing. Most
notably the ability to operate the GMSL bus.

Signed-off-by: Niklas Söderlund <niklas.soderlund+renesas@ragnatech.se>
Signed-off-by: Sakari Ailus <sakari.ailus@linux.intel.com>
Signed-off-by: Mauro Carvalho Chehab <mchehab+huawei@kernel.org>

MAINTAINERS

@@ -11523,6 +11523,12 @@ S:	Maintained
 F:	Documentation/devicetree/bindings/media/i2c/maxim,max9286.yaml
 F:	drivers/media/i2c/max9286.c
 
+MAX96712 QUAD GMSL2 DESERIALIZER DRIVER
+M:	Niklas Söderlund <niklas.soderlund@ragnatech.se>
+L:	linux-media@vger.kernel.org
+S:	Maintained
+F:	drivers/staging/media/max96712/max96712.c
+
 MAX9860 MONO AUDIO VOICE CODEC DRIVER
 M:	Peter Rosin <peda@axentia.se>
 L:	alsa-devel@alsa-project.org (moderated for non-subscribers)

drivers/staging/media/Kconfig

@@ -26,6 +26,8 @@ source "drivers/staging/media/hantro/Kconfig"
 
 source "drivers/staging/media/imx/Kconfig"
 
+source "drivers/staging/media/max96712/Kconfig"
+
 source "drivers/staging/media/meson/vdec/Kconfig"
 
 source "drivers/staging/media/omap4iss/Kconfig"

drivers/staging/media/Makefile

@@ -1,6 +1,7 @@
 # SPDX-License-Identifier: GPL-2.0
 obj-$(CONFIG_INTEL_ATOMISP)     += atomisp/
 obj-$(CONFIG_VIDEO_IMX_MEDIA)	+= imx/
+obj-$(CONFIG_VIDEO_MAX96712)	+= max96712/
 obj-$(CONFIG_VIDEO_MESON_VDEC)	+= meson/vdec/
 obj-$(CONFIG_VIDEO_OMAP4)	+= omap4iss/
 obj-$(CONFIG_VIDEO_ROCKCHIP_VDEC)	+= rkvdec/

drivers/staging/media/max96712/Kconfig

@@ -0,0 +1,13 @@
+# SPDX-License-Identifier: GPL-2.0
+config VIDEO_MAX96712
+	tristate "Maxim MAX96712 Quad GMSL2 Deserializer support"
+	depends on I2C
+	depends on OF_GPIO
+	select V4L2_FWNODE
+	select VIDEO_V4L2_SUBDEV_API
+	select MEDIA_CONTROLLER
+	help
+	  This driver supports the Maxim MAX96712 Quad GMSL2 Deserializer.
+
+	  To compile this driver as a module, choose M here: the
+	  module will be called max96712.

drivers/staging/media/max96712/Makefile

@@ -0,0 +1,2 @@
+# SPDX-License-Identifier: GPL-2.0
+obj-$(CONFIG_VIDEO_MAX96712) += max96712.o