media: stm32: csi: addition of the STM32 CSI driver

The STM32 CSI controller is tightly coupled with the DCMIPP and act as an
input stage to receive data coming from the sensor and transferring
them into the DCMIPP.

Signed-off-by: Alain Volmat <alain.volmat@foss.st.com>
Signed-off-by: Hans Verkuil <hverkuil@xs4all.nl>

MAINTAINERS

@@ -14495,6 +14495,14 @@ W:	https://linuxtv.org
 T:	git git://linuxtv.org/media.git
 F:	drivers/media/dvb-frontends/stv6111*
 
+MEDIA DRIVERS FOR STM32 - CSI
+M:	Alain Volmat <alain.volmat@foss.st.com>
+L:	linux-media@vger.kernel.org
+S:	Supported
+T:	git git://linuxtv.org/media_tree.git
+F:	Documentation/devicetree/bindings/media/st,stm32mp25-csi.yaml
+F:	drivers/media/platform/stm32/stm32-csi.c
+
 MEDIA DRIVERS FOR STM32 - DCMI / DCMIPP
 M:	Hugues Fruchet <hugues.fruchet@foss.st.com>
 M:	Alain Volmat <alain.volmat@foss.st.com>

drivers/media/platform/st/stm32/Kconfig

@@ -1,6 +1,20 @@
 # SPDX-License-Identifier: GPL-2.0-only
 
 # V4L drivers
+config VIDEO_STM32_CSI
+	tristate "STM32 Camera Serial Interface (CSI) support"
+	depends on V4L_PLATFORM_DRIVERS
+	depends on VIDEO_DEV && OF
+	depends on ARCH_STM32 || COMPILE_TEST
+	select MEDIA_CONTROLLER
+	select V4L2_FWNODE
+	help
+	  This module makes the STM32 Camera Serial Interface (CSI)
+	  available as a v4l2 device.
+
+	  To compile this driver as a module, choose M here: the module
+	  will be called stm32-csi.
+
 config VIDEO_STM32_DCMI
 	tristate "STM32 Digital Camera Memory Interface (DCMI) support"
 	depends on V4L_PLATFORM_DRIVERS

drivers/media/platform/st/stm32/Makefile

@@ -1,4 +1,5 @@
 # SPDX-License-Identifier: GPL-2.0-only
+obj-$(CONFIG_VIDEO_STM32_CSI) += stm32-csi.o
 obj-$(CONFIG_VIDEO_STM32_DCMI) += stm32-dcmi.o
 obj-$(CONFIG_VIDEO_STM32_DCMIPP) += stm32-dcmipp/
 stm32-dma2d-objs := dma2d/dma2d.o dma2d/dma2d-hw.o