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arm64: dts: rockchip: Add PWM fan for RockPro64

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RockPro64 has a dedicated circuit for driving a 12V fan from PWM1.

At the moment this makes fan spin at full speed. fancontrol can be used
to control fan speed. E.g. the following config file works well:

INTERVAL=10
DEVPATH=hwmon0=devices/platform/pwm-fan
DEVNAME=hwmon0=pwmfan
FCTEMPS=hwmon0/device/pwm1=../thermal/thermal_zone0/temp
MINTEMP=hwmon0/device/pwm1=40
MAXTEMP=hwmon0/device/pwm1=60
MINSTART=hwmon0/device/pwm1=100
MINSTOP=hwmon0/device/pwm1=70

In the future it would be nice to define trip points in dts file,
so that kernel could adjust fan speed itself.

Signed-off-by: Andrius Štikonas <andrius@stikonas.eu>
Signed-off-by: Heiko Stuebner <heiko@sntech.de>
This commit is contained in:
Andrius Štikonas 2019-07-24 20:17:15 +01:00 committed by Heiko Stuebner
parent 84ebd2da6d
commit 5882d65c16
1 changed files with 11 additions and 0 deletions
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11
arch/arm64/boot/dts/rockchip/rk3399-rockpro64.dts
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@ -58,6 +58,13 @@
};
};
fan: pwm-fan {
compatible = "pwm-fan";
#cooling-cells = <2>;
fan-supply = <&vcc12v_dcin>;
pwms = <&pwm1 0 50000 0>;
};
sdio_pwrseq: sdio-pwrseq {
compatible = "mmc-pwrseq-simple";
clocks = <&rk808 1>;
@ -602,6 +609,10 @@
status = "okay";
};
&pwm1 {
status = "okay";
};
&pwm2 {
status = "okay";
};