[PATCH v2] ARM: dts: imx7d-pico-pi: add OV5645 camera support

[Lech Perczak <lech.perczak@gmail.com>]

Add OV5645 camera device node and enable relevant components in the
video capture data path, so output stream can be captured, and the
camera itself can be controlled over I²C bus.

This is roughly based on descriptions found in downstream kernel tree [1],
adapted to match upstream bindings.

The camera can probe successfully and establish an image path through
MIPI-CSIS and CSI peripherals, and capture the picture at 1280x960px
resolution, or even more, although i.MX7D is a bit underpowered to
stream this uncompressed.

Link: https://github.com/technexion-android/kernel_imx/blob/ce8fd74abf518dac0a09e8dcb37f3496f6375124/arch/arm/boot/dts/imx7d-pico.dtsi#L874 [1]

Signed-off-by: Lech Perczak <lech.perczak@gmail.com>

---

v2:
- Confirmed the video capture is actually possible with this setup.
  24MHz wrap clock actually works.
- Updated MIPI wrap clock to use assigned-clocks binding.

 arch/arm/boot/dts/nxp/imx/imx7d-pico-pi.dts | 61 +++++++++++++++++++++
 1 file changed, 61 insertions(+)

diff --git a/arch/arm/boot/dts/nxp/imx/imx7d-pico-pi.dts b/arch/arm/boot/dts/nxp/imx/imx7d-pico-pi.dts
index 62221131336f..6a6c3c743b41 100644
--- a/arch/arm/boot/dts/nxp/imx/imx7d-pico-pi.dts
+++ b/arch/arm/boot/dts/nxp/imx/imx7d-pico-pi.dts
@@ -59,6 +59,33 @@ polytouch: touchscreen@38 {
 		touchscreen-size-x = <800>;
 		touchscreen-size-y = <480>;
 	};
+
+	camera@3c {
+		compatible = "ovti,ov5645";
+		reg = <0x3c>;
+
+		pinctrl-names = "default";
+		pinctrl-0 = <&pinctrl_camera>;
+
+		clocks = <&clks IMX7D_CLKO1_ROOT_DIV>;
+		assigned-clocks = <&clks IMX7D_CLKO1_ROOT_DIV>;
+		assigned-clock-rates = <24000000>;
+
+		enable-gpios = <&gpio1 4 GPIO_ACTIVE_HIGH>;
+		reset-gpios = <&gpio1 5 GPIO_ACTIVE_LOW>;
+
+		vdda-supply = <&reg_2p5v>;
+		vdddo-supply = <&reg_vref_1v8>;
+		vddd-supply = <&reg_vref_1v8>;
+
+		port {
+			ov5645_to_mipi_csi2: endpoint {
+				remote-endpoint = <&mipi_csi2_in>;
+				clock-lanes = <0>;
+				data-lanes = <1 2>;
+			};
+		};
+	};
 };
 
 &usdhc1 {
@@ -93,5 +120,39 @@ MX7D_PAD_EPDC_DATA04__GPIO2_IO4		0x14
 			MX7D_PAD_EPDC_DATA13__GPIO2_IO13	0x14
 		>;
 	};
+};
+
+&iomuxc_lpsr {
+	pinctrl_camera: cameragrp {
+		fsl,pins = <
+			MX7D_PAD_LPSR_GPIO1_IO04__GPIO1_IO4	0x15
+			MX7D_PAD_LPSR_GPIO1_IO05__GPIO1_IO5	0x15
+			MX7D_PAD_LPSR_GPIO1_IO02__CCM_CLKO1	0x7d
+		>;
+	};
+};
+
+&csi {
+	status = "okay";
+};
+
+&mipi_csi {
+	status = "okay";
+	assigned-clocks = <&clks IMX7D_MIPI_CSI_ROOT_CLK>;
+	assigned-clock-rates = <24000000>;
+
+	ports {
+		port@0 {
+			reg = <0>;
+
+			mipi_csi2_in: endpoint {
+				remote-endpoint = <&ov5645_to_mipi_csi2>;
+				data-lanes = <1 2>;
+			};
+		};
+	};
+};
 
+&video_mux {
+	status = "okay";
 };

base-commit: 79bd2dded182b1d458b18e62684b7f82ffc682e5
-- 
2.47.3