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arm64: dts: renesas: sparrow-hawk-fan-pwm: Rework hwmon comment

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Reword fan DT overlay hwmon comment to accurately locate the fan control
sysfs hwmon node on Retronix R-Car V4H Sparrow Hawk.
No functional change.

Signed-off-by: Marek Vasut <marek.vasut+renesas@mailbox.org>
Reviewed-by: Wolfram Sang <wsa+renesas@sang-engineering.com>
Tested-by: Wolfram Sang <wsa+renesas@sang-engineering.com>
Reviewed-by: Geert Uytterhoeven <geert+renesas@glider.be>
Link: https://patch.msgid.link/20250907225338.426253-1-marek.vasut+renesas@mailbox.org
Signed-off-by: Geert Uytterhoeven <geert+renesas@glider.be>
This commit is contained in:
Marek Vasut
2025-09-12 11:15:00 +02:00
committed by Geert Uytterhoeven
parent babab7f22d
commit 5bf682d974
1 changed files with 5 additions and 10 deletions
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arch/arm64/boot/dts/renesas/r8a779g3-sparrow-hawk-fan-pwm.dtso
+5 -10
View File
@@ -1,6 +1,6 @@
// SPDX-License-Identifier: (GPL-2.0-only OR BSD-2-Clause)
/*
* Device Tree Overlay for the PWM controlled blower fan in connector J3:FAN
* Device Tree Overlay for the PWM controlled blower fan on connector J3:FAN
* on R-Car V4H ES3.0 Sparrow Hawk board
*
* Copyright (C) 2025 Marek Vasut <marek.vasut+renesas@mailbox.org>
@@ -9,21 +9,16 @@
*
* # Localize hwmon sysfs directory that matches the PWM fan,
* # enable the PWM fan, and configure the fan speed manually.
* r8a779g3-sparrow-hawk$ grep -H . /sys/class/hwmon/hwmon?/name
* /sys/class/hwmon/hwmon0/name:sensor1_thermal
* /sys/class/hwmon/hwmon1/name:sensor2_thermal
* /sys/class/hwmon/hwmon2/name:sensor3_thermal
* /sys/class/hwmon/hwmon3/name:sensor4_thermal
* /sys/class/hwmon/hwmon4/name:pwmfan
* ^ ^^^^^^
* r8a779g3-sparrow-hawk$ ls -1 /sys/devices/platform/pwm-fan/hwmon/hwmon?/pwm?_enable
* /sys/devices/platform/pwm-fan/hwmon/hwmon4/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/class/hwmon/hwmon4/pwm1_enable
* r8a779g3-sparrow-hawk$ echo 2 > /sys/devices/platform/pwm-fan/hwmon/hwmon4/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/class/hwmon/hwmon4/pwm1
* r8a779g3-sparrow-hawk$ echo 101 > /sys/devices/platform/pwm-fan/hwmon/hwmon4/pwm1
*/
/dts-v1/;