UPSTREAM: drm/bridge: Introduce LT9611 DSI to HDMI bridge

Lontium Lt9611 is a DSI to HDMI bridge which supports two DSI ports and
I2S port as an input and HDMI port as output

Change-Id: Iae830d6208c111f1a546c390a6ee62fd609fd701
Co-developed-by: Bjorn Andersson <bjorn.andersson@linaro.org>
Signed-off-by: Bjorn Andersson <bjorn.andersson@linaro.org>
Co-developed-by: Srinivas Kandagatla <srinivas.kandagatla@linaro.org>
Signed-off-by: Srinivas Kandagatla <srinivas.kandagatla@linaro.org>
Tested-by: John Stultz <john.stultz@linaro.org>
Signed-off-by: Vinod Koul <vkoul@kernel.org>
Signed-off-by: Sam Ravnborg <sam@ravnborg.org> # fix lt9611_bridge_mode_valid
Link: https://patchwork.freedesktop.org/patch/msgid/20200723163442.1280414-4-vkoul@kernel.org
Signed-off-by: Guochun Huang <hero.huang@rock-chips.com>
(cherry picked from commit 23278bf54a)

Documentation/devicetree/bindings/display/bridge/lontium,lt9611.txt

@@ -0,0 +1,60 @@
+Lontium LT9611 MIPI-DSI to HDMI bridge bindings
+
+Required properties:
+ - compatible: "lontium,lt9611"
+ - reg: i2c address of the bridge
+ - reset-gpios: a GPIO spec for the reset pin
+ - interrupts-extended: Specify the interrupts associated with external
+ - vdd-supply: Reference to the regulator powering the bridge 1.8V power supply pins
+ - vcc-supply: Reference to the regulator powering the bridge 3.3V power supply pins
+
+ptional properties:
+ - enable-gpios: a GPIO spec for the power supply enable control
+
+Example:
+
+&dsi {
+	status = "okay";
+
+	ports {
+		#address-cells = <1>;
+		#size-cells = <0>;
+
+		port@1 {
+			reg = <1>;
+			dsi_out_lt9611: endpoint {
+				remote-endpoint = <&lt9611_in_dsi>;
+			};
+		};
+	};
+
+};
+
+&i2c0 {
+	status = "okay";
+
+	lontium-lt9611@39 {
+		compatible = "lontium,lt9611";
+		status = "okay";
+		reg = <0x39>;
+		interrupts-extended = <&gpio0 RK_PB5 IRQ_TYPE_EDGE_FALLING>;
+		reset-gpios = <&gpio0 RK_PB6 GPIO_ACTIVE_HIGH>;
+		vdd-supply = <&lt9611_1v8>;
+		vcc-supply = <&lt9611_3v3>;
+
+		ports {
+			#address-cells = <1>;
+			#size-cells = <0>;
+
+			port@0 {
+				reg = <0>;
+
+				lt9611_in_dsi: endpoint {
+					remote-endpoint = <&dsi_out_lt9611>;
+				};
+			};
+
+		};
+
+	};
+};

drivers/gpu/drm/bridge/Kconfig

@@ -43,6 +43,19 @@ config DRM_DUMB_VGA_DAC
 	  Support for non-programmable RGB to VGA DAC bridges, such as ADI
 	  ADV7123, TI THS8134 and THS8135 or passive resistor ladder DACs.
 
+config DRM_LONTIUM_LT9611
+	tristate "Lontium LT9611 DSI/HDMI bridge"
+	select SND_SOC_HDMI_CODEC if SND_SOC
+	depends on OF
+	select DRM_PANEL_BRIDGE
+	select DRM_KMS_HELPER
+	select REGMAP_I2C
+	help
+	  Driver for Lontium LT9611 DSI to HDMI bridge
+	  chip driver that converts dual DSI and I2S to
+	  HDMI signals
+	  Please say Y if you have such hardware.
+
 config DRM_LVDS_ENCODER
 	tristate "Transparent parallel to LVDS encoder support"
 	depends on OF

drivers/gpu/drm/bridge/Makefile

@@ -2,6 +2,7 @@
 obj-$(CONFIG_DRM_ANALOGIX_ANX78XX) += analogix-anx78xx.o
 obj-$(CONFIG_DRM_CDNS_DSI) += cdns-dsi.o
 obj-$(CONFIG_DRM_DUMB_VGA_DAC) += dumb-vga-dac.o
+obj-$(CONFIG_DRM_LONTIUM_LT9611) += lontium-lt9611.o
 obj-$(CONFIG_DRM_LVDS_ENCODER) += lvds-encoder.o
 obj-$(CONFIG_DRM_MEGACHIPS_STDPXXXX_GE_B850V3_FW) += megachips-stdpxxxx-ge-b850v3-fw.o
 obj-$(CONFIG_DRM_NXP_PTN3460) += nxp-ptn3460.o