Add rpi-poe-fan driver

Signed-off-by: Serge Schneider <[email protected]>

arch/arm/boot/dts/overlays/Makefile

@@ -103,6 +103,7 @@ dtbo-$(CONFIG_ARCH_BCM2835) += \
 	rpi-dac.dtbo \
 	rpi-display.dtbo \
 	rpi-ft5406.dtbo \
+	rpi-poe.dtbo \
 	rpi-proto.dtbo \
 	rpi-sense.dtbo \
 	rpi-tv.dtbo \

arch/arm/boot/dts/overlays/rpi-poe-overlay.dts

@@ -0,0 +1,61 @@
+/*
+ * Overlay for the Raspberry Pi POE HAT.
+ */
+/dts-v1/;
+/plugin/;
+
+/ {
+	compatible = "brcm,bcm2708";
+
+	fragment@0 {
+		target-path = "/";
+		__overlay__ {
+			fan0: rpi-poe-fan@0 {
+				compatible = "rpi-poe-fan";
+				firmware = <&firmware>;
+				cooling-min-state = <0>;
+				cooling-max-state = <3>;
+				#cooling-cells = <2>;
+				cooling-levels = <0 50 150 255>;
+				status = "okay";
+			};
+		};
+	};
+
+	fragment@1 {
+		target = <&cpu_thermal>;
+		__overlay__ {
+			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 = <&fan0 0 1>;
+				};
+				map1 {
+					trip = <&target>;
+					cooling-device = <&fan0 1 2>;
+				};
+				map2 {
+					trip = <&cpu_hot>;
+					cooling-device = <&fan0 2 3>;
+				};
+			};
+		};
+	};
+};

arch/arm/configs/bcm2709_defconfig

@@ -658,6 +658,7 @@ CONFIG_HWMON=m
 CONFIG_SENSORS_DS1621=m
 CONFIG_SENSORS_JC42=m
 CONFIG_SENSORS_LM75=m
+CONFIG_SENSORS_RPI_POE_FAN=m
 CONFIG_SENSORS_SHT21=m
 CONFIG_SENSORS_SHT3x=m
 CONFIG_SENSORS_SHTC1=m

arch/arm/configs/bcmrpi_defconfig

@@ -651,6 +651,7 @@ CONFIG_HWMON=m
 CONFIG_SENSORS_DS1621=m
 CONFIG_SENSORS_JC42=m
 CONFIG_SENSORS_LM75=m
+CONFIG_SENSORS_RPI_POE_FAN=m
 CONFIG_SENSORS_SHT21=m
 CONFIG_SENSORS_SHT3x=m
 CONFIG_SENSORS_SHTC1=m

drivers/hwmon/Kconfig

@@ -1286,6 +1286,16 @@ config SENSORS_PWM_FAN
 	  This driver can also be built as a module.  If so, the module
 	  will be called pwm-fan.
 
+config SENSORS_RPI_POE_FAN
+	tristate "Raspberry Pi POE HAT fan"
+	depends on RASPBERRYPI_FIRMWARE
+	depends on THERMAL || THERMAL=n
+	help
+	  If you say yes here you get support for Raspberry Pi POE HAT fan.
+
+	  This driver can also be built as a module.  If so, the module
+	  will be called rpi-poe-fan.
+
 config SENSORS_SHT15
 	tristate "Sensiron humidity and temperature sensors. SHT15 and compat."
 	depends on GPIOLIB || COMPILE_TEST

drivers/hwmon/Makefile

@@ -138,6 +138,7 @@ obj-$(CONFIG_SENSORS_PC87427)	+= pc87427.o
 obj-$(CONFIG_SENSORS_PCF8591)	+= pcf8591.o
 obj-$(CONFIG_SENSORS_POWR1220)  += powr1220.o
 obj-$(CONFIG_SENSORS_PWM_FAN)	+= pwm-fan.o
+obj-$(CONFIG_SENSORS_RPI_POE_FAN)	+= rpi-poe-fan.o
 obj-$(CONFIG_SENSORS_S3C)	+= s3c-hwmon.o
 obj-$(CONFIG_SENSORS_SCH56XX_COMMON)+= sch56xx-common.o
 obj-$(CONFIG_SENSORS_SCH5627)	+= sch5627.o