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arm64: dts: renesas: sparrow-hawk: Add overlay for Argon40 fan HAT

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Add a DT overlay to bind the Argon40 fan HAT on the Retronix R-Car V4H
Sparrow Hawk board.  Fan RPM control and full RPM on reboot has been
tested.

Tested-by: Wolfram Sang <wsa+renesas@sang-engineering.com>
Signed-off-by: Marek Vasut <marek.vasut+renesas@mailbox.org>
Reviewed-by: Wolfram Sang <wsa+renesas@sang-engineering.com>
Reviewed-by: Geert Uytterhoeven <geert+renesas@glider.be>
Link: https://patch.msgid.link/20250907161130.218470-1-marek.vasut+renesas@mailbox.org
Signed-off-by: Geert Uytterhoeven <geert+renesas@glider.be>
This commit is contained in:
Marek Vasut 2025-09-07 18:10:53 +02:00 committed by Geert Uytterhoeven
parent 38ef5be6e1
commit 45447550f8
2 changed files with 54 additions and 0 deletions
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3
arch/arm64/boot/dts/renesas/Makefile
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@ -108,6 +108,9 @@ dtb-$(CONFIG_ARCH_R8A779G0) += r8a779g3-sparrow-hawk-camera-j2-imx219.dtb
dtb-$(CONFIG_ARCH_R8A779G0) += r8a779g3-sparrow-hawk-camera-j2-imx462.dtbo
r8a779g3-sparrow-hawk-camera-j2-imx462-dtbs := r8a779g3-sparrow-hawk.dtb r8a779g3-sparrow-hawk-camera-j2-imx462.dtbo
dtb-$(CONFIG_ARCH_R8A779G0) += r8a779g3-sparrow-hawk-camera-j2-imx462.dtb
dtb-$(CONFIG_ARCH_R8A779G0) += r8a779g3-sparrow-hawk-fan-argon40.dtbo
r8a779g3-sparrow-hawk-fan-argon40-dtbs := r8a779g3-sparrow-hawk.dtb r8a779g3-sparrow-hawk-fan-argon40.dtbo
dtb-$(CONFIG_ARCH_R8A779G0) += r8a779g3-sparrow-hawk-fan-argon40.dtb
dtb-$(CONFIG_ARCH_R8A779G0) += r8a779g3-sparrow-hawk-fan-pwm.dtbo
r8a779g3-sparrow-hawk-fan-pwm-dtbs := r8a779g3-sparrow-hawk.dtb r8a779g3-sparrow-hawk-fan-pwm.dtbo
dtb-$(CONFIG_ARCH_R8A779G0) += r8a779g3-sparrow-hawk-fan-pwm.dtb

51
arch/arm64/boot/dts/renesas/r8a779g3-sparrow-hawk-fan-argon40.dtso Normal file
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@ -0,0 +1,51 @@
// SPDX-License-Identifier: (GPL-2.0-only OR BSD-2-Clause)
/*
* Device Tree Overlay for the Argon40 HAT blower fan on connector CN7
* on R-Car V4H ES3.0 Sparrow Hawk board
*
* Copyright (C) 2025 Marek Vasut <marek.vasut+renesas@mailbox.org>
*
* Example usage:
*
* # Localize hwmon sysfs directory that matches the PWM fan,
* # enable the PWM fan, and configure the fan speed manually.
* r8a779g3-sparrow-hawk$ ls -1 /sys/devices/platform/pwm-fan-ext/hwmon/hwmon?/pwm?_enable
* /sys/devices/platform/pwm-fan-ext/hwmon/hwmon0/pwm1_enable
*
* # Select mode 2 , enable fan PWM and regulator and keep them enabled.
* # For details, see Linux Documentation/hwmon/pwm-fan.rst
* r8a779g3-sparrow-hawk$ echo 2 > /sys/devices/platform/pwm-fan-ext/hwmon/hwmon0/pwm1_enable
*
* # Configure PWM fan speed in range 0..255 , 0 is stopped , 255 is full speed .
* # Fan speed 101 is about 2/5 of the PWM fan speed:
* r8a779g3-sparrow-hawk$ echo 101 > /sys/devices/platform/pwm-fan-ext/hwmon/hwmon0/pwm1
*/
/dts-v1/;
/plugin/;
&{/} {
pwm-fan-ext {
compatible = "pwm-fan";
#cooling-cells = <2>;
/* PWM period: 33us ~= 30 kHz */
pwms = <&pwmhat 0 33334 0>;
/* Available cooling levels */
cooling-levels = <0 50 100 150 200 255>;
fan-shutdown-percent = <100>;
};
};
/* Page 31 / IO_CN */
&i2c3 {
#address-cells = <1>;
#size-cells = <0>;
clock-frequency = <400000>;
status = "okay";
pwmhat: pwm@1a {
compatible = "argon40,fan-hat";
reg = <0x1a>;
#pwm-cells = <3>;
};
};