media: platform: synopsys: Add support for HDMI input driver

Add initial support for the Synopsys DesignWare HDMI RX
Controller Driver used by Rockchip RK3588. The driver
supports:
 - HDMI 1.4b and 2.0 modes (HDMI 4k@60Hz)
 - RGB888, YUV422, YUV444 and YCC420 pixel formats
 - CEC
 - EDID configuration

The hardware also has Audio and HDCP capabilities, but these are
not yet supported by the driver.

Co-developed-by: Dingxian Wen <shawn.wen@rock-chips.com>
Signed-off-by: Dingxian Wen <shawn.wen@rock-chips.com>
Signed-off-by: Shreeya Patel <shreeya.patel@collabora.com>
Signed-off-by: Dmitry Osipenko <dmitry.osipenko@collabora.com>
Signed-off-by: Hans Verkuil <hverkuil@xs4all.nl>

drivers/media/platform/Kconfig

@@ -85,6 +85,7 @@ source "drivers/media/platform/rockchip/Kconfig"
 source "drivers/media/platform/samsung/Kconfig"
 source "drivers/media/platform/st/Kconfig"
 source "drivers/media/platform/sunxi/Kconfig"
+source "drivers/media/platform/synopsys/Kconfig"
 source "drivers/media/platform/ti/Kconfig"
 source "drivers/media/platform/verisilicon/Kconfig"
 source "drivers/media/platform/via/Kconfig"

drivers/media/platform/Makefile

@@ -28,6 +28,7 @@ obj-y += rockchip/
 obj-y += samsung/
 obj-y += st/
 obj-y += sunxi/
+obj-y += synopsys/
 obj-y += ti/
 obj-y += verisilicon/
 obj-y += via/

drivers/media/platform/synopsys/Kconfig

@@ -0,0 +1,3 @@
+# SPDX-License-Identifier: GPL-2.0-only
+
+source "drivers/media/platform/synopsys/hdmirx/Kconfig"

drivers/media/platform/synopsys/Makefile

@@ -0,0 +1,2 @@
+# SPDX-License-Identifier: GPL-2.0-only
+obj-y += hdmirx/

drivers/media/platform/synopsys/hdmirx/Kconfig

@@ -0,0 +1,35 @@
+# SPDX-License-Identifier: GPL-2.0
+
+config VIDEO_SYNOPSYS_HDMIRX
+	tristate "Synopsys DesignWare HDMI Receiver driver"
+	depends on VIDEO_DEV
+	select MEDIA_CONTROLLER
+	select VIDEO_V4L2_SUBDEV_API
+	select VIDEOBUF2_DMA_CONTIG
+	select CEC_CORE
+	select HDMI
+	help
+	  Support for Synopsys HDMI HDMI RX Controller.
+	  This driver supports HDMI 2.0 version.
+
+	  To compile this driver as a module, choose M here. The module
+	  will be called synopsys_hdmirx.
+
+config VIDEO_SYNOPSYS_HDMIRX_LOAD_DEFAULT_EDID
+	bool "Load default EDID"
+	depends on VIDEO_SYNOPSYS_HDMIRX
+	help
+	  Preload default EDID (Extended Display Identification Data)
+	  branded by Linux Foundation that exposes display modes up
+	  to 4k@30Hz, which have best compatibility with HDMI transmitters.
+
+	  Enabling this option is recommended for a non-production use-cases.
+	  It will make driver usable out-of-the-box.
+
+	  For a higher display modes you will need to load customized EDID
+	  from userspace using v4l2-ctl tool or by other means.
+
+	  Without enabling this option driver will be practically
+	  non-functional until EDID will be loaded from userspace.
+	  Which is a wanted behavior when using this driver in a
+	  commercial product that should utilize own branded EDID.

drivers/media/platform/synopsys/hdmirx/Makefile

@@ -0,0 +1,4 @@
+# SPDX-License-Identifier: GPL-2.0
+synopsys-hdmirx-objs := snps_hdmirx.o snps_hdmirx_cec.o
+
+obj-$(CONFIG_VIDEO_SYNOPSYS_HDMIRX) += synopsys-hdmirx.o