Commit 45447550 authored by Marek Vasut's avatar Marek Vasut Committed by Geert Uytterhoeven
Browse files

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



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: default avatarWolfram Sang <wsa+renesas@sang-engineering.com>
Signed-off-by: default avatarMarek Vasut <marek.vasut+renesas@mailbox.org>
Reviewed-by: default avatarWolfram Sang <wsa+renesas@sang-engineering.com>
Reviewed-by: default avatarGeert Uytterhoeven <geert+renesas@glider.be>
Link: https://patch.msgid.link/20250907161130.218470-1-marek.vasut+renesas@mailbox.org


Signed-off-by: default avatarGeert Uytterhoeven <geert+renesas@glider.be>
parent 38ef5be6

arch/arm64/boot/dts/renesas/Makefile

+3 −0
Original line number Diff line number Diff line
@@ -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

arch/arm64/boot/dts/renesas/r8a779g3-sparrow-hawk-fan-argon40.dtso

0 → 100644
+51 −0
Original line number Diff line number Diff line 
// 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>;

	};

};