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a719915e76
Add Retronix R-Car V4H Sparrow Hawk board based on Renesas R-Car V4H ES3.0 (R8A779G3) SoC. This is a single-board computer with single gigabit ethernet, DSI-to-eDP bridge, DSI and two CSI2 interfaces, audio codec, two CANFD ports, micro SD card slot, USB PD supply, USB 3.0 ports, M.2 Key-M slot for NVMe SSD, debug UART and JTAG. Tested-by: Kuninori Morimoto <kuninori.morimoto.gx@renesas.com> Tested-by: Niklas Söderlund <niklas.soderlund+renesas@ragnatech.se> Signed-off-by: Marek Vasut <marek.vasut+renesas@mailbox.org> Reviewed-by: Geert Uytterhoeven <geert+renesas@glider.be> Link: https://lore.kernel.org/20250420173829.200553-4-marek.vasut+renesas@mailbox.org Signed-off-by: Geert Uytterhoeven <geert+renesas@glider.be>
44 lines
1.5 KiB
Plaintext
44 lines
1.5 KiB
Plaintext
// SPDX-License-Identifier: (GPL-2.0-only OR BSD-2-Clause)
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/*
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* Device Tree Overlay for the PWM controlled blower fan in connector J3:FAN
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* on R-Car V4H ES3.0 Sparrow Hawk board
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*
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* Copyright (C) 2025 Marek Vasut <marek.vasut+renesas@mailbox.org>
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*
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* Example usage:
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*
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* # Localize hwmon sysfs directory that matches the PWM fan,
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* # enable the PWM fan, and configure the fan speed manually.
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* r8a779g3-sparrow-hawk$ grep -H . /sys/class/hwmon/hwmon?/name
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* /sys/class/hwmon/hwmon0/name:sensor1_thermal
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* /sys/class/hwmon/hwmon1/name:sensor2_thermal
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* /sys/class/hwmon/hwmon2/name:sensor3_thermal
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* /sys/class/hwmon/hwmon3/name:sensor4_thermal
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* /sys/class/hwmon/hwmon4/name:pwmfan
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* ^ ^^^^^^
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*
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* # Select mode 2 , enable fan PWM and regulator and keep them enabled.
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* # For details, see Linux Documentation/hwmon/pwm-fan.rst
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* r8a779g3-sparrow-hawk$ echo 2 > /sys/class/hwmon/hwmon4/pwm1_enable
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*
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* # Configure PWM fan speed in range 0..255 , 0 is stopped , 255 is full speed .
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* # Fan speed 101 is about 2/5 of the PWM fan speed:
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* r8a779g3-sparrow-hawk$ echo 101 > /sys/class/hwmon/hwmon4/pwm1
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*/
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/dts-v1/;
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/plugin/;
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/*
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* Override default PWM fan settings. For a list of available properties,
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* see schema Documentation/devicetree/bindings/hwmon/pwm-fan.yaml .
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*/
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&fan {
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/* Available cooling levels */
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cooling-levels = <0 50 100 150 200 255>;
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/* Four pulses of tacho signal per one revolution */
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pulses-per-revolution = <4>;
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/* PWM period: 100us ~= 10 kHz */
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pwms = <&pwm0 0 100000>;
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};
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