media: imx-pxp: add i.MX Pixel Pipeline driver

Add a V4L2 mem-to-mem scaler/CSC driver for the Pixel Pipeline (PXP)
version found on i.MX6ULL SoCs. A similar variant is used on i.MX7D.

Since this driver only uses the legacy pipeline, it should be reasonably
easy to extend it to work with the older PXP versions found on i.MX6UL,
i.MX6SX, i.MX6SL, i.MX28, and i.MX23.

The driver supports scaling and colorspace conversion. There is
currently no support for rotation, alpha-blending, and the LUTs.

Signed-off-by: Philipp Zabel <p.zabel@pengutronix.de>
Signed-off-by: Hans Verkuil <hans.verkuil@cisco.com>
Signed-off-by: Mauro Carvalho Chehab <mchehab+samsung@kernel.org>

drivers/media/platform/Kconfig

@@ -181,6 +181,15 @@ config VIDEO_CODA
 config VIDEO_IMX_VDOA
 	def_tristate VIDEO_CODA if SOC_IMX6Q || COMPILE_TEST
 
+config VIDEO_IMX_PXP
+	tristate "i.MX Pixel Pipeline (PXP)"
+	depends on VIDEO_DEV && VIDEO_V4L2 && (ARCH_MXC || COMPILE_TEST)
+	select VIDEOBUF2_DMA_CONTIG
+	select V4L2_MEM2MEM_DEV
+	help
+	  The i.MX Pixel Pipeline is a memory-to-memory engine for scaling,
+	  color space conversion, and rotation.
+
 config VIDEO_MEDIATEK_JPEG
 	tristate "Mediatek JPEG Codec driver"
 	depends on MTK_IOMMU_V1 || COMPILE_TEST

drivers/media/platform/Makefile

@@ -25,6 +25,8 @@ obj-$(CONFIG_VIDEO_TI_CAL)		+= ti-vpe/
 obj-$(CONFIG_VIDEO_MX2_EMMAPRP)		+= mx2_emmaprp.o
 obj-$(CONFIG_VIDEO_CODA)		+= coda/
 
+obj-$(CONFIG_VIDEO_IMX_PXP)		+= imx-pxp.o
+
 obj-$(CONFIG_VIDEO_SH_VEU)		+= sh_veu.o
 
 obj-$(CONFIG_CEC_GPIO)			+= cec-gpio/