[PATCH v4 1/2] arm64: dts: qcom: shikra-iqs-evk: Add LT9611UXD HDMI bridge support

[Mohit Dsor <mohit.dsor@oss.qualcomm.com>]

Enable the Shikra MDSS display subsystem on the Qualcomm Shikra IQS
EVK board and add the Lontium LT9611UXD DSI-to-HDMI bridge node.

The LT9611UXD is connected via I2C (bus 4, address 0x41), powered by
a GPIO-controlled 3.3V regulator (PM8150 GPIO4) and an always-on 1.8V
rail. Reset is on GPIO76 and interrupt on GPIO85.

The bridge receives DSI output from MDSS and drives an HDMI-A
connector, with the link wired as: DPU -> DSI0 -> LT9611UXD -> HDMI.

Regulator and pinctrl labels use generic board-level names
(vreg_disp_3p3, bridge_irq_pin, bridge_rst_pin) to decouple them
from the bridge chip.

Signed-off-by: Mohit Dsor <mohit.dsor@oss.qualcomm.com>
---
 arch/arm64/boot/dts/qcom/shikra-iqs-evk.dts | 109 ++++++++++++++++++++++++++++
 1 file changed, 109 insertions(+)

diff --git a/arch/arm64/boot/dts/qcom/shikra-iqs-evk.dts b/arch/arm64/boot/dts/qcom/shikra-iqs-evk.dts
index 5df30ad8211f..fee93410b2e4 100644
--- a/arch/arm64/boot/dts/qcom/shikra-iqs-evk.dts
+++ b/arch/arm64/boot/dts/qcom/shikra-iqs-evk.dts
@@ -8,6 +8,7 @@
 #include "shikra-iqs-som.dtsi"
 #include "shikra-evk.dtsi"
 #include <dt-bindings/gpio/gpio.h>
+#include <dt-bindings/interrupt-controller/irq.h>
 
 / {
 	model = "Qualcomm Technologies, Inc. Shikra IQS EVK";
@@ -23,6 +24,98 @@ aliases {
 	chosen {
 		stdout-path = "serial0:115200n8";
 	};
+
+	hdmi_connector: hdmi-connector {
+		compatible = "hdmi-connector";
+		type = "a";
+
+		port {
+			hdmi_con: endpoint {
+				remote-endpoint = <&lt9611_out>;
+			};
+		};
+	};
+
+	vreg_disp_3p3: regulator-disp-3p3 {
+		compatible = "regulator-fixed";
+		regulator-name = "vreg_disp_3p3";
+		regulator-min-microvolt = <3300000>;
+		regulator-max-microvolt = <3300000>;
+		gpio = <&pm8150_gpios 4 GPIO_ACTIVE_HIGH>;
+		enable-active-high;
+		pinctrl-0 = <&lcd_bias_en>;
+		pinctrl-names = "default";
+	};
+};
+
+&i2c4 {
+	status = "okay";
+
+	lt9611uxd: lt9611uxd@41 {
+		compatible = "lontium,lt9611uxd";
+		reg = <0x41>;
+		interrupts-extended = <&tlmm 85 IRQ_TYPE_EDGE_FALLING>;
+		reset-gpios = <&tlmm 76 GPIO_ACTIVE_LOW>;
+		vcc-supply = <&vreg_disp_3p3>;
+		vdd-supply = <&pm8150_s4>;
+
+		pinctrl-0 = <&bridge_irq_pin &bridge_rst_pin>;
+		pinctrl-names = "default";
+
+		ports {
+			#address-cells = <1>;
+			#size-cells = <0>;
+
+			port@0 {
+				reg = <0>;
+
+				lt9611_a: endpoint {
+					remote-endpoint = <&mdss_dsi0_out>;
+				};
+			};
+
+			port@2 {
+				reg = <2>;
+
+				lt9611_out: endpoint {
+					remote-endpoint = <&hdmi_con>;
+				};
+			};
+		};
+	};
+};
+
+&mdss {
+	status = "okay";
+};
+
+&mdss_dsi0 {
+	vdda-supply = <&pm8150_l11>;
+
+	status = "okay";
+};
+
+&mdss_dsi0_out {
+	remote-endpoint = <&lt9611_a>;
+	data-lanes = <0 1 2 3>;
+};
+
+&mdss_dsi0_phy {
+	status = "okay";
+};
+
+&pm8150_gpios {
+	lcd_bias_en: lcd-bias-en-state {
+		pins = "gpio4";
+		function = PMIC_GPIO_FUNC_NORMAL;
+		bias-disable;
+	};
+};
+
+&pm8150_l11 {
+	regulator-min-microvolt = <1232000>;
+	regulator-max-microvolt = <1232000>;
+	regulator-allow-set-load;
 };
 
 &remoteproc_cdsp {
@@ -67,6 +160,22 @@ &sdhc_2 {
 	status = "okay";
 };
 
+&tlmm {
+	bridge_irq_pin: bridge-irq-state {
+		pins = "gpio85";
+		function = "gpio";
+		drive-strength = <2>;
+		bias-disable;
+	};
+
+	bridge_rst_pin: bridge-rst-state {
+		pins = "gpio76";
+		function = "gpio";
+		drive-strength = <8>;
+		bias-disable;
+	};
+};
+
 &usb_1_hsphy {
 	vdd-supply = <&pm8150_l4>;
 	vdda-pll-supply = <&pm8150_l12>;

-- 
2.34.1