linux-kernel - [PATCH] arm64: dts: meson: radxa-zero2: add pwm-fan support

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Message-Id: <20231028075445.3515664-1-christianshewitt@gmail.com>
Date:   Sat, 28 Oct 2023 07:54:45 +0000
From:   Christian Hewitt <christianshewitt@...il.com>
To:     Rob Herring <robh+dt@...nel.org>,
        Krzysztof Kozlowski <krzysztof.kozlowski+dt@...aro.org>,
        Neil Armstrong <neil.armstrong@...aro.org>,
        Kevin Hilman <khilman@...libre.com>,
        Jerome Brunet <jbrunet@...libre.com>,
        Martin Blumenstingl <martin.blumenstingl@...glemail.com>,
        devicetree@...r.kernel.org, linux-arm-kernel@...ts.infradead.org,
        linux-amlogic@...ts.infradead.org, linux-kernel@...r.kernel.org
Cc:     Christian Hewitt <christianshewitt@...il.com>,
        Yuntian Zhang <yt@...xa.com>
Subject: [PATCH] arm64: dts: meson: radxa-zero2: add pwm-fan support

The A311D on Zero2 needs active cooling and the board includes a header to
connect a simple fan. Add pwm-fan support with basic thermal properties so
the fan runs when connected.

Suggested-by: Yuntian Zhang <yt@...xa.com>
Signed-off-by: Christian Hewitt <christianshewitt@...il.com>
---
 .../dts/amlogic/meson-g12b-radxa-zero2.dts    | 27 +++++++++++++++++++
 1 file changed, 27 insertions(+)

diff --git a/arch/arm64/boot/dts/amlogic/meson-g12b-radxa-zero2.dts b/arch/arm64/boot/dts/amlogic/meson-g12b-radxa-zero2.dts
index 890f5bfebb03..895b6ea67180 100644
--- a/arch/arm64/boot/dts/amlogic/meson-g12b-radxa-zero2.dts
+++ b/arch/arm64/boot/dts/amlogic/meson-g12b-radxa-zero2.dts
@@ -33,6 +33,15 @@ memory@0 {
 		reg = <0x0 0x0 0x0 0x80000000>;
 	};
 
+	fan0: pwm-fan {
+		compatible = "pwm-fan";
+		#cooling-cells = <2>;
+		cooling-min-state = <0>;
+		cooling-max-state = <4>;
+		cooling-levels = <0 64 128 192 255>;
+		pwms = <&pwm_AO_ab 0 40000 0>;
+	};
+
 	gpio-keys-polled {
 		compatible = "gpio-keys-polled";
 		poll-interval = <100>;
@@ -286,6 +295,24 @@ &cpu103 {
 	clock-latency = <50000>;
 };
 
+&cpu_thermal {
+	cooling-maps {
+		map0 {
+			trip = <&cpu_passive>;
+			cooling-device = <&fan0 THERMAL_NO_LIMIT THERMAL_NO_LIMIT>;
+		};
+	};
+};
+
+&ddr_thermal {
+	cooling-maps {
+		map0 {
+			trip = <&ddr_passive>;
+			cooling-device = <&fan0 THERMAL_NO_LIMIT THERMAL_NO_LIMIT>;
+		};
+	};
+};
+
 &frddr_a {
 	status = "okay";
 };
-- 
2.34.1