[PATCH 1/5] arm64: dts: freescale: imx8mp-toradex-smarc: Add DSI to HDMI adapter overlay

[Ernest Van Hoecke]

From: Ernest Van Hoecke <ernest.vanhoecke@xxxxxxxxxxx>

Add a device tree overlay for the Toradex DSI to HDMI Adapter, an
accessory that connects to the Toradex SMARC Development Board DSI
connector and provides a full-size HDMI Type-A output. The adapter is
based on the Lontium LT8912B DSI-to-HDMI bridge.

The overlay is also combined with the SMARC Development Board device
tree to provide a ready-to-use DTB.

Link: https://developer.toradex.com/hardware/accessories/add-ons/dsi-hdmi-adapter
Signed-off-by: Ernest Van Hoecke <ernest.vanhoecke@xxxxxxxxxxx>
---
 arch/arm64/boot/dts/freescale/Makefile             |   4 +
 .../imx8mp-toradex-smarc-dsi-to-hdmi.dtso          | 103 +++++++++++++++++++++
 2 files changed, 107 insertions(+)

diff --git a/arch/arm64/boot/dts/freescale/Makefile b/arch/arm64/boot/dts/freescale/Makefile
index a80cccf34eb5..b5519fb36b5b 100644
--- a/arch/arm64/boot/dts/freescale/Makefile
+++ b/arch/arm64/boot/dts/freescale/Makefile
@@ -709,11 +709,15 @@ dtb-$(CONFIG_ARCH_MXC) += imx8mp-skov-revc-bd500.dtb
 dtb-$(CONFIG_ARCH_MXC) += imx8mp-skov-revc-hdmi.dtb
 dtb-$(CONFIG_ARCH_MXC) += imx8mp-skov-revc-tian-g07017.dtb
 dtb-$(CONFIG_ARCH_MXC) += imx8mp-skov-revc-jutouch-jt101tm023.dtb
+dtb-$(CONFIG_ARCH_MXC) += imx8mp-toradex-smarc-dev-dsi-to-hdmi.dtb
 dtb-$(CONFIG_ARCH_MXC) += imx8mp-toradex-smarc-dev.dtb
+dtb-$(CONFIG_ARCH_MXC) += imx8mp-toradex-smarc-dsi-to-hdmi.dtbo
 dtb-$(CONFIG_ARCH_MXC) += imx8mp-tqma8mpql-mba8mpxl.dtb
 dtb-$(CONFIG_ARCH_MXC) += imx8mp-tqma8mpql-mba8mp-ras314.dtb
 dtb-$(CONFIG_ARCH_MXC) += imx8mp-tqma8mpqs-mb-smarc-2.dtb
 
+imx8mp-toradex-smarc-dev-dsi-to-hdmi-dtbs := imx8mp-toradex-smarc-dev.dtb imx8mp-toradex-smarc-dsi-to-hdmi.dtbo
+
 imx8mp-tx8p-ml81-moduline-display-106-av101hdt-a10-dtbs += imx8mp-tx8p-ml81-moduline-display-106.dtb \
 	imx8mp-tx8p-ml81-moduline-display-106-av101hdt-a10.dtbo
 imx8mp-tx8p-ml81-moduline-display-106-av123z7m-n17-dtbs += imx8mp-tx8p-ml81-moduline-display-106.dtb \
diff --git a/arch/arm64/boot/dts/freescale/imx8mp-toradex-smarc-dsi-to-hdmi.dtso b/arch/arm64/boot/dts/freescale/imx8mp-toradex-smarc-dsi-to-hdmi.dtso
new file mode 100644
index 000000000000..270cf567ace1
--- /dev/null
+++ b/arch/arm64/boot/dts/freescale/imx8mp-toradex-smarc-dsi-to-hdmi.dtso
@@ -0,0 +1,103 @@
+// SPDX-License-Identifier: GPL-2.0-only OR MIT
+/*
+ * Copyright (c) Toradex
+ *
+ * Toradex DSI to HDMI Adapter connected via Toradex SMARC Development
+ * Board DSI connector J44. Open J95 to select the carrier DSI route.
+ *
+ * https://developer.toradex.com/hardware/accessories/add-ons/dsi-hdmi-adapter
+ * https://www.toradex.com/accessories/verdin-dsi-to-hdmi-adapter
+ */
+
+/dts-v1/;
+/plugin/;
+
+#include <dt-bindings/gpio/gpio.h>
+
+#include "imx8mp-pinfunc.h"
+
+&{/} {
+	dsi-hdmi-connector {
+		compatible = "hdmi-connector";
+		pinctrl-names = "default";
+		pinctrl-0 = <&pinctrl_hdmi_hpd>;
+		/* I2C on DSI Connector Pins 52/54 */
+		ddc-i2c-bus = <&i2c_dsi_1>;
+		/* SMARC LCD1_BKLT_PWM (SMARC S122) - HPD */
+		hpd-gpios = <&gpio5 5 GPIO_ACTIVE_HIGH>;
+		type = "a";
+
+		port {
+			dsi_hdmi_connector_in: endpoint {
+				remote-endpoint = <&dsi_hdmi_bridge_out>;
+			};
+		};
+	};
+};
+
+/* I2C on DSI Connector Pins 4/6 */
+&i2c_dsi_0 {
+	#address-cells = <1>;
+	#size-cells = <0>;
+
+	hdmi-bridge@48 {
+		compatible = "lontium,lt8912b";
+		reg = <0x48>;
+		/* SMARC LCD1_BKLT_EN (SMARC S107) */
+		reset-gpios = <&som_gpio_expander 7 GPIO_ACTIVE_LOW>;
+		vcchdmipll-supply = <&reg_carrier_1p8v>;
+		vcchdmitx-supply = <&reg_carrier_1p8v>;
+		vcclvdspll-supply = <&reg_carrier_1p8v>;
+		vcclvdstx-supply = <&reg_carrier_1p8v>;
+		vccmipirx-supply = <&reg_carrier_1p8v>;
+		vccsysclk-supply = <&reg_carrier_1p8v>;
+		vdd-supply = <&reg_carrier_1p8v>;
+
+		ports {
+			#address-cells = <1>;
+			#size-cells = <0>;
+
+			port@0 {
+				reg = <0>;
+
+				dsi_hdmi_bridge_in: endpoint {
+					data-lanes = <1 2 3 4>;
+					remote-endpoint = <&mipi_dsi_out>;
+				};
+			};
+
+			port@1 {
+				reg = <1>;
+
+				dsi_hdmi_bridge_out: endpoint {
+					remote-endpoint = <&dsi_hdmi_connector_in>;
+				};
+			};
+		};
+	};
+};
+
+&lcdif1 {
+	status = "okay";
+};
+
+&mipi_dsi {
+	samsung,esc-clock-frequency = <16000000>;
+
+	status = "okay";
+};
+
+&mipi_dsi_out {
+	remote-endpoint = <&dsi_hdmi_bridge_in>;
+};
+
+/* SMARC LCD1_BKLT_PWM (SMARC S122) repurposed as HDMI HPD GPIO */
+&pwm1 {
+	status = "disabled";
+};
+
+&iomuxc {
+	pinctrl_hdmi_hpd: hdmihpdgpiogrp {
+		fsl,pins = <MX8MP_IOMUXC_SPDIF_EXT_CLK__GPIO5_IO05	0x104>; /* SMARC S122 - LCD1_BKLT_PWM */
+	};
+};

-- 
2.43.0