[PATCH v6 5/5] arm64: dts: qcom: sm8750-lenovo-elden: describe the WL2868C regulators

[Qianhui Xu]

The camera devices of the Lenovo Legion Y700 Gen4 are powered by a
WL2868C camera PMIC on i2c10: LDO1 feeds the rear sensor DVDD, LDO2 the
front sensor DVDD, LDO3 the front sensor AVDD, LDO4 the rear sensor
AVDD, LDO5 the VCM VDD, LDO7 the DOVDD of both sensors and the VCM
VDDIO, all at fixed voltages including the offsets programmed by the
stock firmware. LDO6 is not wired out on this board.

i2c10 is a GENI I2C controller inside the qupv3_2 wrapper, so both
qupv3_2 and its gpi_dma2 parent are enabled alongside, otherwise i2c10
never populates and the regulators would never register.

The VSYS input of the PMIC is the always-on system rail of the tablet
and is described as a fixed regulator. The VIN12, VIN34, VIN5 and VIN7
inputs are fed by SPMI PMIC rails that are not described yet, so they
are left out and follow with the board series that adds the PMICs.

The consumers of these regulators (the rear sensor and its VCM on
cci0) are not described here: the CCI controllers are being added by
Hangxiang Ma's SM8750 series, and the sensor nodes follow with the
camera series that depends on it.

Signed-off-by: Qianhui Xu <xiaqinghuan@xxxxxxxxxxxxxxxx>
---
 .../boot/dts/qcom/sm8750-lenovo-elden.dts     | 79 +++++++++++++++++++
 1 file changed, 79 insertions(+)

diff --git a/arch/arm64/boot/dts/qcom/sm8750-lenovo-elden.dts b/arch/arm64/boot/dts/qcom/sm8750-lenovo-elden.dts
index 821950715c..73f4452f46 100644
--- a/arch/arm64/boot/dts/qcom/sm8750-lenovo-elden.dts
+++ b/arch/arm64/boot/dts/qcom/sm8750-lenovo-elden.dts
@@ -5,6 +5,7 @@
 
 /dts-v1/;
 
+#include <dt-bindings/gpio/gpio.h>
 #include "sm8750.dtsi"
 
 / {
@@ -43,8 +44,86 @@ bi_tcxo_ao_div2: bi-tcxo-ao-div2-clk {
 			clock-div = <2>;
 		};
 	};
+
+	/*
+	 * VSYS of the camera PMIC is the always-on system rail of the tablet.
+	 * The SPMI PMICs that generate it are not described yet, so it is
+	 * modelled as a fixed regulator without a voltage constraint.
+	 */
+	wl2868c_vsys: regulator-vsys {
+		compatible = "regulator-fixed";
+		regulator-name = "wl2868c_vsys";
+		regulator-always-on;
+	};
+};
+
+&gpi_dma2 {
+	status = "okay";
+};
+
+&qupv3_2 {
+	status = "okay";
+};
+
+&i2c10 {
+	status = "okay";
+
+	pmic@2f {
+		compatible = "willsemi,wl2868c";
+		reg = <0x2f>;
+		reset-gpios = <&tlmm 126 GPIO_ACTIVE_LOW>;
+		pinctrl-names = "default";
+		pinctrl-0 = <&camera_pmic_default>;
+		vsys-supply = <&wl2868c_vsys>;
+
+		regulators {
+			/* Voltages include the offsets programmed by stock firmware. */
+			camera_ldo1: ldo1 {
+				regulator-name = "camera_ldo1";
+				regulator-min-microvolt = <1128000>;
+				regulator-max-microvolt = <1128000>;
+			};
+
+			camera_ldo2: ldo2 {
+				regulator-name = "camera_ldo2";
+				regulator-min-microvolt = <1288000>;
+				regulator-max-microvolt = <1288000>;
+			};
+
+			camera_ldo3: ldo3 {
+				regulator-name = "camera_ldo3";
+				regulator-min-microvolt = <2816000>;
+				regulator-max-microvolt = <2816000>;
+			};
+
+			camera_ldo4: ldo4 {
+				regulator-name = "camera_ldo4";
+				regulator-min-microvolt = <2824000>;
+				regulator-max-microvolt = <2824000>;
+			};
+
+			camera_ldo5: ldo5 {
+				regulator-name = "camera_ldo5";
+				regulator-min-microvolt = <2808000>;
+				regulator-max-microvolt = <2808000>;
+			};
+
+			/* LDO6 is not wired out on this board. */
+			camera_ldo7: ldo7 {
+				regulator-name = "camera_ldo7";
+				regulator-min-microvolt = <1800000>;
+				regulator-max-microvolt = <1800000>;
+			};
+		};
+	};
 };
 
 &tlmm {
 	gpio-reserved-ranges = <39 1>, <74 1>;
+
+	camera_pmic_default: camera-pmic-default-state {
+		pins = "gpio126";
+		function = "gpio";
+		bias-disable;
+	};
 };
-- 
2.53.0