linux-kernel - [PATCH v3] arm64: dts: rockchip: add thermal fan control to rockpro64

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Date:   Fri, 30 Jul 2021 11:17:27 -0400
From:   Peter Geis <pgwipeout@...il.com>
To:     Rob Herring <robh+dt@...nel.org>, Heiko Stuebner <heiko@...ech.de>
Cc:     Robin Murphy <robin.murphy@....com>,
        Peter Geis <pgwipeout@...il.com>, devicetree@...r.kernel.org,
        linux-arm-kernel@...ts.infradead.org,
        linux-rockchip@...ts.infradead.org, linux-kernel@...r.kernel.org
Subject: [PATCH v3] arm64: dts: rockchip: add thermal fan control to rockpro64

The rockpro64 had a fan node since
commit 5882d65c1691 ("arm64: dts: rockchip: Add PWM fan for RockPro64")
however it was never tied into the thermal driver for automatic control.

Add the links to the thermal node to permit the kernel to handle this
automatically.
Borrowed from the (rk3399-khadas-edge.dtsi).

Signed-off-by: Peter Geis <pgwipeout@...il.com>
---

Changelog:
v3:
Removed the gpu nodes to prevent in-fighting (thanks Robin!)

v2:
Adjusted fan setpoints for less noise

 .../boot/dts/rockchip/rk3399-rockpro64.dtsi   | 29 +++++++++++++++++++
 1 file changed, 29 insertions(+)

diff --git a/arch/arm64/boot/dts/rockchip/rk3399-rockpro64.dtsi b/arch/arm64/boot/dts/rockchip/rk3399-rockpro64.dtsi
index 6bff8db7d33e..83db4ca67334 100644
--- a/arch/arm64/boot/dts/rockchip/rk3399-rockpro64.dtsi
+++ b/arch/arm64/boot/dts/rockchip/rk3399-rockpro64.dtsi
@@ -69,6 +69,7 @@ diy_led: led-1 {
 
 	fan: pwm-fan {
 		compatible = "pwm-fan";
+		cooling-levels = <0 100 150 200 255>;
 		#cooling-cells = <2>;
 		fan-supply = <&vcc12v_dcin>;
 		pwms = <&pwm1 0 50000 0>;
@@ -245,6 +246,34 @@ &cpu_b1 {
 	cpu-supply = <&vdd_cpu_b>;
 };
 
+&cpu_thermal {
+	trips {
+		cpu_warm: cpu_warm {
+			temperature = <55000>;
+			hysteresis = <2000>;
+			type = "active";
+		};
+
+		cpu_hot: cpu_hot {
+			temperature = <65000>;
+			hysteresis = <2000>;
+			type = "active";
+		};
+	};
+
+	cooling-maps {
+		map2 {
+			trip = <&cpu_warm>;
+			cooling-device = <&fan THERMAL_NO_LIMIT 1>;
+		};
+
+		map3 {
+			trip = <&cpu_hot>;
+			cooling-device = <&fan 2 THERMAL_NO_LIMIT>;
+		};
+	};
+};
+
 &emmc_phy {
 	status = "okay";
 };
-- 
2.25.1