dtoverlays: Add an overlay for the Infineon IRS1125

The Infineon IRS1125 is a CSI2 time of flight depth sensor
which has a suitable V4L2 subdevice driver.

Add an overlay for configuring it.

Signed-off-by: Markus Proeller <markus.proeller@pieye.org>

arch/arm/boot/dts/overlays/Makefile

@@ -83,6 +83,7 @@ dtbo-$(CONFIG_ARCH_BCM2835) += \
 	iqaudio-dac.dtbo \
 	iqaudio-dacplus.dtbo \
 	iqaudio-digi-wm8804-audio.dtbo \
+	irs1125.dtbo \
 	jedec-spi-nor.dtbo \
 	justboom-dac.dtbo \
 	justboom-digi.dtbo \

arch/arm/boot/dts/overlays/README

@@ -1347,6 +1347,18 @@ Params: card_name               Override the default, "IQAudIODigi", card name.
                                 dai stream name.
 
 
+Name:   irs1125
+Info:   Infineon irs1125 TOF camera module.
+        Uses Unicam 1, which is the standard camera connector on most Pi
+        variants.
+Load:   dtoverlay=irs1125,<param>=<val>
+Params: i2c_pins_0_1            Use pins 0&1 for the I2C instead of 44&45.
+                                Useful on Compute Modules.
+
+        i2c_pins_28_29          Use pins 28&29 for the I2C instead of 44&45.
+                                This is required for Pi B+, 2, 0, and 0W.
+
+
 Name:   jedec-spi-nor
 Info:   Adds support for JEDEC-compliant SPI NOR flash devices.  (Note: The
         "jedec,spi-nor" kernel driver was formerly known as "m25p80".)

arch/arm/boot/dts/overlays/irs1125-overlay.dts

@@ -0,0 +1,97 @@
+// SPDX-License-Identifier: GPL-2.0-only
+// Definitions for IRS1125 camera module on VC I2C bus
+/dts-v1/;
+/plugin/;
+
+/{
+	compatible = "brcm,bcm2835";
+
+	fragment@0 {
+		target = <&i2c_vc>;
+		__overlay__ {
+			#address-cells = <1>;
+			#size-cells = <0>;
+			status = "okay";
+
+			irs1125: irs1125@3D {
+				compatible = "infineon,irs1125";
+				reg = <0x3D>;
+				status = "okay";
+
+				pwdn-gpios = <&gpio 5 0>;
+				clocks = <&irs1125_clk>;
+
+				irs1125_clk: camera-clk {
+					compatible = "fixed-clock";
+					#clock-cells = <0>;
+					clock-frequency = <26000000>;
+				};
+
+				port {
+					irs1125_0: endpoint {
+						remote-endpoint = <&csi1_ep>;
+						clock-lanes = <0>;
+						data-lanes = <1 2>;
+						clock-noncontinuous;
+						link-frequencies =
+							/bits/ 64 <297000000>;
+					};
+				};
+			};
+		};
+	};
+
+	fragment@1 {
+		target = <&csi1>;
+		__overlay__ {
+			status = "okay";
+
+			port {
+				csi1_ep: endpoint {
+					remote-endpoint = <&irs1125_0>;
+				};
+			};
+		};
+	};
+
+	fragment@2 {
+		target = <&i2c0_pins>;
+		__dormant__ {
+			brcm,pins = <28 29>;
+			brcm,function = <4>; /* alt0 */
+		};
+	};
+	fragment@3 {
+		target = <&i2c0_pins>;
+		__overlay__ {
+			brcm,pins = <44 45>;
+			brcm,function = <5>; /* alt1 */
+		};
+	};
+	fragment@4 {
+		target = <&i2c0_pins>;
+		__dormant__ {
+			brcm,pins = <0 1>;
+			brcm,function = <4>; /* alt0 */
+		};
+	};
+	fragment@5 {
+		target = <&i2c_vc>;
+		__overlay__ {
+			status = "okay";
+		};
+	};
+
+	fragment@6 {
+		target-path="/__overrides__";
+		__overlay__ {
+			cam0-pwdn-ctrl = <&irs1125>,"pwdn-gpios:0";
+			cam0-pwdn      = <&irs1125>,"pwdn-gpios:4";
+		};
+	};
+
+	__overrides__ {
+		i2c_pins_0_1 = <0>,"-2-3+4";
+		i2c_pins_28_29 = <0>,"+2-3-4";
+	};
+};