[PATCH 0/4] arm64: dts: renesas: Enable GMSL on R8A77970 V3M Eagle

@@ -6,6 +6,8 @@
  * Copyright (C) 2017 Cogent Embedded, Inc.
  */
 
+#include <dt-bindings/gpio/gpio.h>
+
 /dts-v1/;
 #include "r8a77970.dtsi"
 

@@ -188,6 +190,11 @@ i2c0_pins: i2c0 {
 		function = "i2c0";
 	};
 
+	i2c3_pins: i2c3 {
+		groups = "i2c3_a";
+		function = "i2c3";
+	};
+
 	qspi0_pins: qspi0 {
 		groups = "qspi0_ctrl", "qspi0_data4";
 		function = "qspi0";

@@ -266,6 +273,131 @@ &rwdt {
 	status = "okay";
 };
 
+&csi40 {
+	status = "okay";
+
+	ports {
+		#address-cells = <1>;
+		#size-cells = <0>;
+
+		port@0 {
+			reg = <0>;
+
+			csi40_in: endpoint {
+				clock-lanes = <0>;
+				data-lanes = <1 2 3 4>;
+				remote-endpoint = <&max9286_out0>;
+			};
+		};
+	};
+};
+
+&i2c3 {
+	pinctrl-0 = <&i2c3_pins>;
+	pinctrl-names = "default";
+
+	status = "okay";
+	clock-frequency = <400000>;
+
+	gmsl: gmsl-deserializer@48 {
+		gpio-controller;
+		#gpio-cells = <2>;
+
+		compatible = "maxim,max9286";
+		reg = <0x48>;
+
+		/* eagle-pca9654-max9286-pwdn */
+		enable-gpios = <&io_expander 0 GPIO_ACTIVE_HIGH>;
+
+		/*
+		 * Workaround: Hog the CAMVDD line high as we can't establish a
+		 * regulator-fixed on the gpio_chip exposed by &gmsl due to
+		 * circular-dependency issues.
+		 */
+		camvdd_en {
+			gpio-hog;
+			gpios = <0 0>;
+			output-low;
+			line-name = "CAMVDD_EN";
+		};
+
+		ports {
+			#address-cells = <1>;
+			#size-cells = <0>;
+
+			port@0 {
+				reg = <0>;
+				max9286_in0: endpoint {
+				};
+			};
+
+			port@1 {
+				reg = <1>;
+				max9286_in1: endpoint {
+				};
+			};
+
+			port@2 {
+				reg = <2>;
+				max9286_in2: endpoint {
+				};
+			};
+
+			port@3 {
+				reg = <3>;
+				max9286_in3: endpoint {
+				};
+			};
+
+			port@4 {
+				reg = <4>;
+				max9286_out0: endpoint {
+					clock-lanes = <0>;
+					data-lanes = <1 2 3 4>;
+					remote-endpoint = <&csi40_in>;
+				};
+			};
+		};
+
+		i2c-mux {
+			#address-cells = <1>;
+			#size-cells = <0>;
+
+			i2c@0 {
+				#address-cells = <1>;
+				#size-cells = <0>;
+				reg = <0>;
+
+				status = "disabled";
+			};
+
+			i2c@1 {
+				#address-cells = <1>;
+				#size-cells = <0>;
+				reg = <1>;
+
+				status = "disabled";
+			};
+
+			i2c@2 {
+				#address-cells = <1>;
+				#size-cells = <0>;
+				reg = <2>;
+
+				status = "disabled";
+			};
+
+			i2c@3 {
+				#address-cells = <1>;
+				#size-cells = <0>;
+				reg = <3>;
+
+				status = "disabled";
+			};
+		};
+	};
+};
+
 &scif0 {
 	pinctrl-0 = <&scif0_pins>;
 	pinctrl-names = "default";

@@ -50,6 +50,15 @@ properties:
   '#gpio-cells':
     const: 2
 
+  camvdd_en:
+    type: object
+    properties:
+      gpio-hog: true
+      gpios: true
+      output-low: true
+      line-name:
+        const: "CAMVDD_EN"
+
   maxim,reverse-channel-microvolt:
     minimum: 30000
     maximum: 200000

@@ -0,0 +1,186 @@
+// SPDX-License-Identifier: GPL-2.0+
+/*
+ * Device Tree Source (overlay) for the Eagle V3M GMSL connectors
+ *
+ * Copyright (C) 2017 Ideas on Board <kieran.bingham@ideasonboard.com>
+ * Copyright (C) 2021 Jacopo Mondi <jacopo+renesas@jmondi.org>
+ *
+ * This overlay allows you to define GMSL cameras connected to the FAKRA
+ * connectors on the Eagle-V3M (or compatible) board.
+ *
+ * The following cameras are currently supported:
+ *    "imi,rdacm20"
+ *    "imi,rdacm21"
+ */
+
+#include <dt-bindings/gpio/gpio.h>
+
+/*
+ * Select which cameras are in use:
+ * #define EAGLE_CAMERA0_RDACM20
+ * #define EAGLE_CAMERA0_RDACM21
+ *
+ * The two camera modules are configured with different image formats
+ * and cannot be mixed.
+ */
+#define EAGLE_CAMERA0_RDACM20
+#define EAGLE_CAMERA1_RDACM20
+#define EAGLE_CAMERA2_RDACM20
+#define EAGLE_CAMERA3_RDACM20
+
+/* Set the compatible string based on the camera model. */
+#if defined(EAGLE_CAMERA0_RDACM21) || defined(EAGLE_CAMERA1_RDACM21) || \
+    defined(EAGLE_CAMERA2_RDACM21) || defined(EAGLE_CAMERA3_RDACM21)
+#define EAGLE_CAMERA_MODEL	"imi,rdacm21"
+#define EAGLE_USE_RDACM21
+#elif defined(EAGLE_CAMERA0_RDACM20) || defined(EAGLE_CAMERA1_RDACM20) || \
+    defined(EAGLE_CAMERA2_RDACM20) || defined(EAGLE_CAMERA3_RDACM20)
+#define EAGLE_CAMERA_MODEL	"imi,rdacm20"
+#define EAGLE_USE_RDACM20
+#endif
+
+/* Define which cameras are available. */
+#if defined(EAGLE_CAMERA0_RDACM21) || defined(EAGLE_CAMERA0_RDACM20)
+#define EAGLE_USE_CAMERA_0
+#endif
+
+#if defined(EAGLE_CAMERA1_RDACM21) || defined(EAGLE_CAMERA1_RDACM20)
+#define EAGLE_USE_CAMERA_1
+#endif
+
+#if defined(EAGLE_CAMERA2_RDACM21) || defined(EAGLE_CAMERA2_RDACM20)
+#define EAGLE_USE_CAMERA_2
+#endif
+
+#if defined(EAGLE_CAMERA3_RDACM21) || defined(EAGLE_CAMERA3_RDACM20)
+#define EAGLE_USE_CAMERA_3
+#endif
+
+/* Define the endpoint links. */
+#ifdef EAGLE_USE_CAMERA_0
+&max9286_in0 {
+	remote-endpoint = <&fakra_con0>;
+};
+#endif
+
+#ifdef EAGLE_USE_CAMERA_1
+&max9286_in1 {
+	remote-endpoint = <&fakra_con1>;
+};
+#endif
+
+#ifdef EAGLE_USE_CAMERA_2
+&max9286_in2 {
+	remote-endpoint = <&fakra_con2>;
+};
+#endif
+
+#ifdef EAGLE_USE_CAMERA_3
+&max9286_in3 {
+	remote-endpoint = <&fakra_con3>;
+};
+#endif
+
+/* Populate the GMSL i2c-mux bus with camera nodes. */
+#if defined(EAGLE_USE_RDACM21) || defined(EAGLE_USE_RDACM20)
+
+#ifdef EAGLE_USE_CAMERA_0
+&vin0 {
+	status = "okay";
+};
+#endif
+
+#ifdef EAGLE_USE_CAMERA_1
+&vin1 {
+	status = "okay";
+};
+#endif
+
+#ifdef EAGLE_USE_CAMERA_2
+&vin2 {
+	status = "okay";
+};
+#endif
+
+#ifdef EAGLE_USE_CAMERA_3
+&vin3 {
+	status = "okay";
+};
+#endif
+
+&gmsl {
+
+	status = "okay";
+	maxim,reverse-channel-microvolt = <100000>;
+
+	i2c-mux {
+#ifdef EAGLE_USE_CAMERA_0
+		i2c@0 {
+			status = "okay";
+
+			camera@51 {
+				compatible = EAGLE_CAMERA_MODEL;
+				reg = <0x51>, <0x61>;
+
+				port {
+					fakra_con0: endpoint {
+						remote-endpoint = <&max9286_in0>;
+					};
+				};
+			};
+		};
+#endif
+
+#ifdef EAGLE_USE_CAMERA_1
+		i2c@1 {
+			status = "okay";
+
+			camera@52 {
+				compatible = EAGLE_CAMERA_MODEL;
+				reg = <0x52>, <0x62>;
+
+				port {
+					fakra_con1: endpoint {
+						remote-endpoint = <&max9286_in1>;
+					};
+				};
+			};
+		};
+#endif
+
+#ifdef EAGLE_USE_CAMERA_2
+		i2c@2 {
+			status = "okay";
+
+			camera@53 {
+				compatible = EAGLE_CAMERA_MODEL;
+				reg = <0x53>, <0x63>;
+
+				port {
+					fakra_con2: endpoint {
+						remote-endpoint = <&max9286_in2>;
+					};
+				};
+			};
+		};
+#endif
+
+#ifdef EAGLE_USE_CAMERA_3
+		i2c@3 {
+			status = "okay";
+
+			camera@54 {
+				compatible = EAGLE_CAMERA_MODEL;
+				reg = <0x54>, <0x64>;
+
+				port {
+					fakra_con3: endpoint {
+						remote-endpoint = <&max9286_in3>;
+					};
+				};
+			};
+		};
+#endif
+	};
+};
+#endif

@@ -404,3 +404,6 @@ &scif0 {
 
 	status = "okay";
 };
+
+/* FAKRA Overlay */
+#include "eagle-gmsl.dtsi"