media: raspberrypi: Add support for PiSP BE

Add support for the Raspberry Pi PiSP Back End.

The driver has been upported from the Raspberry Pi kernel at revision
f74893f8a0c2 ("drivers: media: pisp_be: Update seqeuence numbers of the
buffers").

The ISP documentation is available at:
https://datasheets.raspberrypi.com/camera/raspberry-pi-image-signal-processor-specification.pdfSigned-off-by: David Plowman <david.plowman@raspberrypi.com>
Signed-off-by: Naushir Patuck <naush@raspberrypi.com>
Signed-off-by: Nick Hollinghurst <nick.hollinghurst@raspberrypi.org>
Signed-off-by: Jacopo Mondi <jacopo.mondi@ideasonboard.com>
Signed-off-by: Sakari Ailus <sakari.ailus@linux.intel.com>
Signed-off-by: Hans Verkuil <hverkuil-cisco@xs4all.nl>
[hverkuil: drop dev_err after platform_get_irq to fix a coccinelle check]

MAINTAINERS

@@ -18811,6 +18811,7 @@ L:	Raspberry Pi Kernel Maintenance <kernel-list@raspberrypi.com>
 L:	linux-media@vger.kernel.org
 S:	Maintained
 F:	Documentation/devicetree/bindings/media/raspberrypi,pispbe.yaml
+F:	drivers/media/platform/raspberrypi/pisp_be/
 F:	include/uapi/linux/media/raspberrypi/
 
 RC-CORE / LIRC FRAMEWORK

drivers/media/platform/Kconfig

@@ -79,6 +79,7 @@ source "drivers/media/platform/nuvoton/Kconfig"
 source "drivers/media/platform/nvidia/Kconfig"
 source "drivers/media/platform/nxp/Kconfig"
 source "drivers/media/platform/qcom/Kconfig"
+source "drivers/media/platform/raspberrypi/Kconfig"
 source "drivers/media/platform/renesas/Kconfig"
 source "drivers/media/platform/rockchip/Kconfig"
 source "drivers/media/platform/samsung/Kconfig"

drivers/media/platform/Makefile

@@ -22,6 +22,7 @@ obj-y += nuvoton/
 obj-y += nvidia/
 obj-y += nxp/
 obj-y += qcom/
+obj-y += raspberrypi/
 obj-y += renesas/
 obj-y += rockchip/
 obj-y += samsung/

drivers/media/platform/raspberrypi/Kconfig

+# SPDX-License-Identifier: GPL-2.0-only
+
+comment "Raspberry Pi media platform drivers"
+
+source "drivers/media/platform/raspberrypi/pisp_be/Kconfig"

drivers/media/platform/raspberrypi/Makefile

+# SPDX-License-Identifier: GPL-2.0
+
+obj-y += pisp_be/

drivers/media/platform/raspberrypi/pisp_be/Kconfig

+config VIDEO_RASPBERRYPI_PISP_BE
+	tristate "Raspberry Pi PiSP Backend (BE) ISP driver"
+	depends on V4L_PLATFORM_DRIVERS
+	depends on VIDEO_DEV
+	select VIDEO_V4L2_SUBDEV_API
+	select MEDIA_CONTROLLER
+	select VIDEOBUF2_DMA_CONTIG
+	help
+	  Say Y here to enable support for the PiSP Backend (BE) ISP driver.
+
+	  To compile this driver as a module, choose M here. The module will be
+	  called pisp-be.

drivers/media/platform/raspberrypi/pisp_be/Makefile

+# SPDX-License-Identifier: GPL-2.0
+#
+# Makefile for Raspberry Pi PiSP Backend driver
+#
+pisp-be-objs := pisp_be.o
+obj-$(CONFIG_VIDEO_RASPBERRYPI_PISP_BE) += pisp-be.o