[PATCH] arm64: dts: freescale: add gpio-fan/thermal support for Google i.MX 8MQ Phanbell

[Vitor Massaru Iha <vitor@massaru.org>]

It was based on Google Source Code for Coral Edge TPU Mendel release:
https://coral.googlesource.com/linux-imx/

It was tested on Coral Dev Board using this command:
  sudo stress --cpu 4 --timeout 3600

Signed-off-by: Vitor Massaru Iha <vitor@massaru.org>
---
 .../boot/dts/freescale/imx8mq-phanbell.dts    | 78 +++++++++++++++++++
 arch/arm64/boot/dts/freescale/imx8mq.dtsi     |  2 +-
 2 files changed, 79 insertions(+), 1 deletion(-)

diff --git a/arch/arm64/boot/dts/freescale/imx8mq-phanbell.dts b/arch/arm64/boot/dts/freescale/imx8mq-phanbell.dts
index 3f2a489a4ad8..fb9f208d1e41 100644
--- a/arch/arm64/boot/dts/freescale/imx8mq-phanbell.dts
+++ b/arch/arm64/boot/dts/freescale/imx8mq-phanbell.dts
@@ -35,6 +35,14 @@
 		gpio = <&gpio2 19 GPIO_ACTIVE_HIGH>;
 		enable-active-high;
 	};
+
+	fan: gpio_fan {
+		compatible = "gpio-fan";
+		gpio-fan,speed-map = <0 0 8600 1>;
+		gpios = <&gpio3 5 GPIO_ACTIVE_HIGH>;
+		#cooling-cells = <2>;
+		status = "okay";
+	};
 };
 
 &A53_0 {
@@ -374,3 +382,73 @@
 		>;
 	};
 };
+
+&tmu {
+	throttle-cfgs {
+		throttle_devfreq: devfreq {
+			throttle,max_state = <2>;
+			#cooling-cells = <2>;
+		};
+	};
+};
+
+&cpu_thermal {
+	trips {
+		cpu_alert0: trip0 {
+			temperature = <75000>;
+			hysteresis = <2000>;
+			type = "passive";
+		};
+
+		cpu_alert1: trip1 {
+			temperature = <80000>;
+			hysteresis = <2000>;
+			type = "passive";
+		};
+
+		cpu_alert2: trip2 {
+			temperature = <85000>;
+			hysteresis = <2000>;
+			type = "passive";
+		};
+
+		cpu_crit0: trip3 {
+			temperature = <90000>;
+			hysteresis = <2000>;
+			type = "critical";
+		};
+
+		fan_toggle0: trip4 {
+			temperature = <65000>;
+			hysteresis = <10000>;
+			type = "active";
+		};
+	};
+
+	cooling-maps {
+		map0 {
+			trip = <&cpu_alert0>;
+			cooling-device =
+			<&throttle_devfreq 0 1>, /* 1/2 GPU Clock */
+			<&A53_0 0 1>; /* Exclude highest OPP */
+		};
+
+		map1 {
+			trip = <&cpu_alert1>;
+			cooling-device =
+			<&A53_0 0 2>; /* Exclude two highest OPPs */
+		};
+
+		map2 {
+			trip = <&cpu_alert2>;
+			cooling-device =
+			<&throttle_devfreq 0 2>; /* Min GPU Clock, disable CPU2/3 */
+		};
+
+		map4 {
+			trip = <&fan_toggle0>;
+			cooling-device = <&fan 0 1>;
+		};
+	};
+};
+
diff --git a/arch/arm64/boot/dts/freescale/imx8mq.dtsi b/arch/arm64/boot/dts/freescale/imx8mq.dtsi
index 6a1e83922c71..a3bb17a6b9df 100644
--- a/arch/arm64/boot/dts/freescale/imx8mq.dtsi
+++ b/arch/arm64/boot/dts/freescale/imx8mq.dtsi
@@ -198,7 +198,7 @@
 	};
 
 	thermal-zones {
-		cpu-thermal {
+		cpu_thermal: cpu-thermal {
 			polling-delay-passive = <250>;
 			polling-delay = <2000>;
 			thermal-sensors = <&tmu 0>;
-- 
2.21.1