[PATCH RFC 4/4] arm64: dts: imx8mq-librem5: Add rear camera

[Vincent Cloutier]

From: Vincent Cloutier <vincent at cloutier.co>

Add the Librem 5 rear camera sensor node and enable the second CSI-2
capture path that receives data from it.

Describe the Samsung S5K3L6 sensor with the upstream binding property
names, including reset-gpios and the link frequencies used by the initial
two-lane RAW8/RAW10 driver modes.

Signed-off-by: Vincent Cloutier <vincent at cloutier.co>
Assisted-by: OpenCode:gpt-5.5
---
 arch/arm64/boot/dts/freescale/imx8mq-librem5.dtsi | 51 +++++++++++++++++++++++
 1 file changed, 51 insertions(+)

diff --git a/arch/arm64/boot/dts/freescale/imx8mq-librem5.dtsi b/arch/arm64/boot/dts/freescale/imx8mq-librem5.dtsi
index f5d529c5baf3..12d5fb3440c5 100644
--- a/arch/arm64/boot/dts/freescale/imx8mq-librem5.dtsi
+++ b/arch/arm64/boot/dts/freescale/imx8mq-librem5.dtsi
@@ -318,6 +318,10 @@ &csi1 {
 	status = "okay";
 };
 
+&csi2 {
+	status = "okay";
+};
+
 &ddrc {
 	operating-points-v2 = <&ddrc_opp_table>;
 	status = "okay";
@@ -434,6 +438,13 @@ MX8MQ_IOMUXC_ENET_RXC_GPIO1_IO25	0x83
 		>;
 	};
 
+	pinctrl_csi2: csi2grp {
+		fsl,pins = <
+			/* CSI2_NRST */
+			MX8MQ_IOMUXC_ENET_RD0_GPIO1_IO26	0x83
+		>;
+	};
+
 	pinctrl_charger_in: chargeringrp {
 		fsl,pins = <
 			/* CHRG_INT */
@@ -1175,6 +1186,31 @@ vcm at c {
 		vcc-supply = <&reg_csi_1v8>;
 	};
 
+	camera_rear: camera at 2d {
+		compatible = "samsung,s5k3l6";
+		reg = <0x2d>;
+		pinctrl-names = "default";
+		pinctrl-0 = <&pinctrl_csi2>;
+		clocks = <&clk IMX8MQ_CLK_CLKO2>;
+		assigned-clocks = <&clk IMX8MQ_CLK_CLKO2>;
+		assigned-clock-rates = <25000000>;
+		reset-gpios = <&gpio1 26 GPIO_ACTIVE_LOW>;
+		vdda-supply = <&reg_vcam_2v8>;
+		vddd-supply = <&reg_vcam_1v2>;
+		vddio-supply = <&reg_csi_1v8>;
+		rotation = <270>;
+		orientation = <1>;
+
+		port {
+			camera2_ep: endpoint {
+				data-lanes = <1 2>;
+				link-frequencies = /bits/ 64
+					<537500000 600000000 625000000>;
+				remote-endpoint = <&mipi2_sensor_ep>;
+			};
+		};
+	};
+
 	bat: fuel-gauge at 36 {
 		compatible = "maxim,max17055";
 		reg = <0x36>;
@@ -1226,6 +1262,21 @@ mipi1_sensor_ep: endpoint {
 	};
 };
 
+&mipi_csi2 {
+	status = "okay";
+
+	ports {
+		port at 0 {
+			reg = <0>;
+
+			mipi2_sensor_ep: endpoint {
+				remote-endpoint = <&camera2_ep>;
+				data-lanes = <1 2>;
+			};
+		};
+	};
+};
+
 &mipi_dsi {
 	#address-cells = <1>;
 	#size-cells = <0>;
-- 
2.53.0