linux-kernel - [PATCH v2 4/9] arm64: dts: ti: k3-am69-sk: Enable camera peripherals

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Date: Thu, 8 Feb 2024 14:12:49 +0530
From: Vaishnav Achath <vaishnav.a@...com>
To: <vigneshr@...com>, <nm@...com>, <conor+dt@...nel.org>, <kristo@...nel.org>,
        <krzysztof.kozlowski+dt@...aro.org>, <robh+dt@...nel.org>
CC: <j-luthra@...com>, <devicetree@...r.kernel.org>, <j-choudhary@...com>,
        <kernel@...gutronix.de>, <linux-arm-kernel@...ts.infradead.org>,
        <linux-kernel@...r.kernel.org>, <u-kumar1@...com>, <vaishnav.a@...com>,
        <afd@...com>
Subject: [PATCH v2 4/9] arm64: dts: ti: k3-am69-sk: Enable camera peripherals

CSI cameras are controlled using I2C. On AM69 Starter Kit, this is routed
to I2C-1, so enable the instance, TCA9543 I2C switch and the TCA6408
GPIO expander on the bus. AM69 SK has the CSI2RX routed to a MIPI CSI
connector and to 22-pin RPi camera connector through an analog mux with
GPIO control, model that so that an overlay can control the mux state
according to connected cameras.

AM69 SK schematics: https://www.ti.com/lit/zip/sprr466

Signed-off-by: Vaishnav Achath <vaishnav.a@...com>
---

V1->V2: Update commit message with schematics.

 arch/arm64/boot/dts/ti/k3-am69-sk.dts | 51 +++++++++++++++++++++++++++
 1 file changed, 51 insertions(+)

diff --git a/arch/arm64/boot/dts/ti/k3-am69-sk.dts b/arch/arm64/boot/dts/ti/k3-am69-sk.dts
index 5f0a43a69333..46cf90bb3eb8 100644
--- a/arch/arm64/boot/dts/ti/k3-am69-sk.dts
+++ b/arch/arm64/boot/dts/ti/k3-am69-sk.dts
@@ -322,6 +322,14 @@ tfp410_out: endpoint {
 			};
 		};
 	};
+
+	csi_mux: mux-controller {
+		compatible = "gpio-mux";
+		#mux-state-cells = <1>;
+		mux-gpios = <&exp2 1 GPIO_ACTIVE_HIGH>;
+		idle-state = <0>;
+	};
+
 };
 
 &main_pmx0 {
@@ -341,6 +349,13 @@ J784S4_IOPAD(0x0e4, PIN_INPUT_PULLUP, 0) /* (AP37) I2C0_SDA */
 		>;
 	};
 
+	main_i2c1_pins_default: main-i2c1-default-pins {
+		pinctrl-single,pins = <
+			J784S4_IOPAD(0x0ac, PIN_INPUT_PULLUP, 13) /* (AE34) MCASP0_AXR15.I2C1_SCL */
+			J784S4_IOPAD(0x0b0, PIN_INPUT_PULLUP, 13) /* (AL33) MCASP1_AXR3.I2C1_SDA */
+		>;
+	};
+
 	main_mmc1_pins_default: main-mmc1-default-pins {
 		bootph-all;
 		pinctrl-single,pins = <
@@ -775,6 +790,42 @@ exp1: gpio@21 {
 	};
 };
 
+&main_i2c1 {
+	pinctrl-names = "default";
+	pinctrl-0 = <&main_i2c1_pins_default>;
+	clock-frequency = <400000>;
+	status = "okay";
+
+	exp2: gpio@21 {
+		compatible = "ti,tca6408";
+		reg = <0x21>;
+		gpio-controller;
+		#gpio-cells = <2>;
+		gpio-line-names = "CSI_VIO_SEL", "CSI_MUX_SEL_2", "CSI2_RSTz",
+				  "IO_EXP_CAM0_GPIO1", "IO_EXP_CAM1_GPIO1";
+	};
+
+	i2c-mux@70 {
+		compatible = "nxp,pca9543";
+		#address-cells = <1>;
+		#size-cells = <0>;
+		reg = <0x70>;
+
+		cam0_i2c: i2c@0 {
+			#address-cells = <1>;
+			#size-cells = <0>;
+			reg = <0>;
+		};
+
+		cam1_i2c: i2c@1 {
+			#address-cells = <1>;
+			#size-cells = <0>;
+			reg = <1>;
+		};
+
+	};
+};
+
 &main_sdhci0 {
 	bootph-all;
 	/* eMMC */
-- 
2.34.1