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Add rpi-poe-fan driver
Signed-off-by: Serge Schneider <[email protected]> PoE HAT driver cleanup * Fix undeclared variable in rpi_poe_fan_suspend * Add SPDX-License-Identifier * Expand PoE acronym in Kconfig help * Give clearer error message on of_property_count_u32_elems fail * Add documentation * Add vendor to of_device_id compatible string. * Rename m_data_s struct to fw_data_s * Fix typos Fixes: #2665 Signed-off-by: Serge Schneider <[email protected]>
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‎Documentation/devicetree/bindings/hwmon/rpi-poe-fan.txt

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Bindings for the Raspberry Pi PoE HAT fan
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Required properties:
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- compatible : "raspberrypi,rpi-poe-fan"
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- firmware : Reference to the RPi firmware device node
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- pwms : the PWM that is used to control the PWM fan
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- cooling-levels : PWM duty cycle values in a range from 0 to 255
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which correspond to thermal cooling states
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Example:
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fan0: rpi-poe-fan@0 {
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compatible = "raspberrypi,rpi-poe-fan";
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firmware = <&firmware>;
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cooling-min-state = <0>;
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cooling-max-state = <3>;
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#cooling-cells = <2>;
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cooling-levels = <0 50 150 255>;
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status = "okay";
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};
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thermal-zones {
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cpu_thermal: cpu-thermal {
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trips {
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threshold: trip-point@0 {
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temperature = <45000>;
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hysteresis = <5000>;
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type = "active";
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};
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target: trip-point@1 {
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temperature = <50000>;
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hysteresis = <2000>;
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type = "active";
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};
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cpu_hot: cpu_hot@0 {
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temperature = <55000>;
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hysteresis = <2000>;
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type = "active";
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};
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};
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cooling-maps {
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map0 {
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trip = <&threshold>;
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cooling-device = <&fan0 0 1>;
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};
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map1 {
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trip = <&target>;
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cooling-device = <&fan0 1 2>;
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};
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map2 {
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trip = <&cpu_hot>;
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cooling-device = <&fan0 2 3>;
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};
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};
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};
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};

‎Documentation/hwmon/rpi-poe-fan

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Kernel driver rpi-poe-fan
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=====================
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This driver enables the use of the Raspberry Pi PoE HAT fan.
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Author: Serge Schneider <[email protected]>
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Description
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-----------
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The driver implements a simple interface for driving the Raspberry Pi PoE
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(Power over Ethernet) HAT fan. The driver passes commands to the Raspberry Pi
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firmware through the mailbox property interface. The firmware then forwards
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the commands to the board over I2C on the ID_EEPROM pins. The driver exposes
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the fan to the user space through the hwmon sysfs interface.

‎arch/arm/boot/dts/overlays/Makefile

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@@ -100,6 +100,7 @@ dtbo-$(CONFIG_ARCH_BCM2835) += \
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rpi-dac.dtbo \
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rpi-display.dtbo \
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rpi-ft5406.dtbo \
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rpi-poe.dtbo \
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rpi-proto.dtbo \
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rpi-sense.dtbo \
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rpi-tv.dtbo \

‎arch/arm/boot/dts/overlays/README

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@@ -1515,6 +1515,12 @@ Params: touchscreen-size-x Touchscreen X resolution (default 800)
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touchscreen-swapped-x-y Swap X and Y cordinates (default 0);
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Name: rpi-poe
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Info: Raspberry Pi POE HAT
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Load: dtoverlay=rpi-poe
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Params: <None>
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Name: rpi-proto
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Info: Configures the RPi Proto audio card
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Load: dtoverlay=rpi-proto

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

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/*
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* Overlay for the Raspberry Pi POE HAT.
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*/
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/dts-v1/;
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/plugin/;
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/ {
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compatible = "brcm,bcm2708";
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fragment@0 {
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target-path = "/";
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__overlay__ {
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fan0: rpi-poe-fan@0 {
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compatible = "raspberrypi,rpi-poe-fan";
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firmware = <&firmware>;
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cooling-min-state = <0>;
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cooling-max-state = <3>;
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#cooling-cells = <2>;
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cooling-levels = <0 50 150 255>;
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status = "okay";
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};
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};
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};
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fragment@1 {
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target = <&cpu_thermal>;
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__overlay__ {
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trips {
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threshold: trip-point@0 {
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temperature = <45000>;
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hysteresis = <5000>;
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type = "active";
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};
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target: trip-point@1 {
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temperature = <50000>;
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hysteresis = <2000>;
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type = "active";
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};
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cpu_hot: cpu_hot@0 {
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temperature = <55000>;
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hysteresis = <2000>;
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type = "active";
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};
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};
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cooling-maps {
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map0 {
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trip = <&threshold>;
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cooling-device = <&fan0 0 1>;
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};
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map1 {
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trip = <&target>;
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cooling-device = <&fan0 1 2>;
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};
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map2 {
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trip = <&cpu_hot>;
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cooling-device = <&fan0 2 3>;
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};
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};
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};
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};
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};

‎arch/arm/configs/bcm2709_defconfig

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@@ -657,6 +657,7 @@ CONFIG_HWMON=m
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CONFIG_SENSORS_DS1621=m
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CONFIG_SENSORS_JC42=m
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CONFIG_SENSORS_LM75=m
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CONFIG_SENSORS_RPI_POE_FAN=m
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CONFIG_SENSORS_SHT21=m
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CONFIG_SENSORS_SHT3x=m
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CONFIG_SENSORS_SHTC1=m

‎arch/arm/configs/bcmrpi_defconfig

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CONFIG_SENSORS_DS1621=m
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CONFIG_SENSORS_JC42=m
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CONFIG_SENSORS_LM75=m
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CONFIG_SENSORS_RPI_POE_FAN=m
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CONFIG_SENSORS_SHT21=m
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CONFIG_SENSORS_SHT3x=m
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CONFIG_SENSORS_SHTC1=m

‎drivers/hwmon/Kconfig

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

‎drivers/hwmon/Makefile

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@@ -141,6 +141,7 @@ obj-$(CONFIG_SENSORS_PC87427) += pc87427.o
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obj-$(CONFIG_SENSORS_PCF8591) += pcf8591.o
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obj-$(CONFIG_SENSORS_POWR1220) += powr1220.o
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obj-$(CONFIG_SENSORS_PWM_FAN) += pwm-fan.o
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obj-$(CONFIG_SENSORS_RPI_POE_FAN) += rpi-poe-fan.o
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obj-$(CONFIG_SENSORS_S3C) += s3c-hwmon.o
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obj-$(CONFIG_SENSORS_SCH56XX_COMMON)+= sch56xx-common.o
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obj-$(CONFIG_SENSORS_SCH5627) += sch5627.o

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