[PATCH 1/1] arm64: dts: freescale: Add PWM fan support

[Alexander Stein]

This adds the support for optional PWM fan 422J/2HP.

Signed-off-by: Alexander Stein <alexander.stein at ew.tq-group.com>
---
Now with inverted polarity support for pwm-fan in place, add PWM fan DT
nodes for TQMa8MPQL + MBa8MPxL. As this is optional, it's disabled by
default. This is based on next-20221018.

Note: This device needs 'pwm1_enable' set to 3. E.g. using udev rule:
SUBSYSTEM=="hwmon", DRIVERS=="pwm-fan", ATTR{pwm1_enable}="3"

 .../freescale/imx8mp-tqma8mpql-mba8mpxl.dts   | 76 +++++++++++++++++++
 1 file changed, 76 insertions(+)

diff --git a/arch/arm64/boot/dts/freescale/imx8mp-tqma8mpql-mba8mpxl.dts b/arch/arm64/boot/dts/freescale/imx8mp-tqma8mpql-mba8mpxl.dts
index 7a32379cd006..ffd117f17bbe 100644
--- a/arch/arm64/boot/dts/freescale/imx8mp-tqma8mpql-mba8mpxl.dts
+++ b/arch/arm64/boot/dts/freescale/imx8mp-tqma8mpql-mba8mpxl.dts
@@ -55,6 +55,21 @@ clk_xtal25: clk-xtal25 {
 		clock-frequency = <25000000>;
 	};
 
+	fan0: pwm-fan {
+		compatible = "pwm-fan";
+		pinctrl-names = "default";
+		pinctrl-0 = <&pinctrl_pwmfan>;
+		fan-supply = <&reg_pwm_fan>;
+		#cooling-cells = <2>;
+		/* typical 25 kHz -> 40.000 nsec */
+		pwms = <&pwm3 0 40000 PWM_POLARITY_INVERTED>;
+		cooling-levels = <0 32 64 128 196 240>;
+		pulses-per-revolution = <2>;
+		interrupt-parent = <&gpio5>;
+		interrupts = <18 IRQ_TYPE_EDGE_FALLING>;
+		status = "disabled";
+	};
+
 	gpio-keys {
 		compatible = "gpio-keys";
 		pinctrl-names = "default";
@@ -115,6 +130,18 @@ display: display {
 		status = "disabled";
 	};
 
+	reg_pwm_fan: regulator-pwm-fan {
+		compatible = "regulator-fixed";
+		pinctrl-names = "default";
+		pinctrl-0 = <&pinctrl_regpwmfan>;
+		regulator-name = "FAN_PWR";
+		regulator-min-microvolt = <12000000>;
+		regulator-max-microvolt = <12000000>;
+		gpio = <&gpio4 27 GPIO_ACTIVE_HIGH>;
+		enable-active-high;
+		vin-supply = <&reg_vcc_12v0>;
+	};
+
 	reg_usdhc2_vmmc: regulator-usdhc2 {
 		compatible = "regulator-fixed";
 		pinctrl-names = "default";
@@ -172,6 +199,47 @@ linux,cma {
 			linux,cma-default;
 		};
 	};
+
+	thermal-zones {
+		soc-thermal {
+			trips {
+				soc_active0: trip-active0 {
+					temperature = <40000>;
+					hysteresis = <5000>;
+					type = "active";
+				};
+
+				soc_active1: trip-active1 {
+					temperature = <48000>;
+					hysteresis = <3000>;
+					type = "active";
+				};
+
+				soc_active2: trip-active2 {
+					temperature = <60000>;
+					hysteresis = <10000>;
+					type = "active";
+				};
+			};
+
+			cooling-maps {
+				map1 {
+					trip = <&soc_active0>;
+					cooling-device = <&fan0 1 1>;
+				};
+
+				map2 {
+					trip = <&soc_active1>;
+					cooling-device = <&fan0 2 2>;
+				};
+
+				map3 {
+					trip = <&soc_active2>;
+					cooling-device = <&fan0 3 3>;
+				};
+			};
+		};
+	};
 };
 
 &ecspi1 {
@@ -725,10 +793,18 @@ pinctrl_pwm3: pwm3grp {
 		fsl,pins = <MX8MP_IOMUXC_I2C3_SDA__PWM3_OUT		0x14>;
 	};
 
+	pinctrl_pwmfan: pwmfangrp {
+		fsl,pins = <MX8MP_IOMUXC_I2C3_SCL__GPIO5_IO18		0x80>; /* FAN RPM */
+	};
+
 	pinctrl_reg12v0: reg12v0grp {
 		fsl,pins = <MX8MP_IOMUXC_SD1_DATA4__GPIO2_IO06		0x140>; /* VCC12V enable */
 	};
 
+	pinctrl_regpwmfan: regpwmfangrp {
+		fsl,pins = <MX8MP_IOMUXC_SAI2_MCLK__GPIO4_IO27		0x80>;
+	};
+
 	/* X61 */
 	pinctrl_uart1: uart1grp {
 		fsl,pins = <MX8MP_IOMUXC_SD1_CLK__UART1_DCE_TX		0x140>,
-- 
2.25.1