[PATCH v4 10/11] DO NOT MERGE: ARM: dts: Add RPi's official PoE hat support

[Nicolas Saenz Julienne]

This is an example on how to enable the fan on top of RPi's official PoE
hat.

Signed-off-by: Nicolas Saenz Julienne <nsaenzjulienne@xxxxxxx>
---

Changes since v1:
 - Update patch to use 2 pwm cells

 arch/arm/boot/dts/bcm2711-rpi-4-b.dts | 54 +++++++++++++++++++++++++++
 1 file changed, 54 insertions(+)

diff --git a/arch/arm/boot/dts/bcm2711-rpi-4-b.dts b/arch/arm/boot/dts/bcm2711-rpi-4-b.dts
index 09a1182c2936..361db82619a4 100644
--- a/arch/arm/boot/dts/bcm2711-rpi-4-b.dts
+++ b/arch/arm/boot/dts/bcm2711-rpi-4-b.dts
@@ -5,6 +5,7 @@
 #include "bcm283x-rpi-usb-peripheral.dtsi"
 
 #include <dt-bindings/reset/raspberrypi,firmware-reset.h>
+#include <dt-bindings/pwm/raspberrypi,firmware-pwm.h>
 
 / {
 	compatible = "raspberrypi,4-model-b", "brcm,bcm2711";
@@ -68,6 +69,54 @@ sd_vcc_reg: sd_vcc_reg {
 		enable-active-high;
 		gpio = <&expgpio 6 GPIO_ACTIVE_HIGH>;
 	};
+
+	fan: pwm-fan {
+		compatible = "pwm-fan";
+		cooling-levels = <0 50 150 255>;
+		#cooling-cells = <2>;
+		pwms = <&fwpwm RASPBERRYPI_FIRMWARE_PWM_POE 80000>;
+	};
+
+	thermal-zones {
+		cpu_thermal: cpu-thermal {
+			trips {
+				threshold: trip-point@0 {
+					temperature = <45000>;
+					hysteresis = <5000>;
+					type = "active";
+				};
+
+				target: trip-point@1 {
+					temperature = <50000>;
+					hysteresis = <2000>;
+					type = "active";
+				};
+
+				cpu_hot: cpu_hot@0 {
+					temperature = <55000>;
+					hysteresis = <2000>;
+					type = "active";
+				};
+			};
+
+			cooling-maps {
+				map0 {
+					trip = <&threshold>;
+					cooling-device = <&fan 0 1>;
+				};
+
+				map1 {
+					trip = <&target>;
+					cooling-device = <&fan 1 2>;
+				};
+
+				map2 {
+					trip = <&cpu_hot>;
+					cooling-device = <&fan 2 3>;
+				};
+			};
+		};
+	};
 };
 
 &ddc0 {
@@ -103,6 +152,11 @@ reset: reset {
 		compatible = "raspberrypi,firmware-reset";
 		#reset-cells = <1>;
 	};
+
+	fwpwm: pwm {
+		compatible = "raspberrypi,firmware-pwm";
+		#pwm-cells = <2>;
+	};
 };
 
 &gpio {
-- 
2.29.2