linux-kernel - [PATCH] arm64: dts: freescale: imx8mp-toradex-smarc: add fan cooling levels

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Message-Id: <20250613-tdx-smarc-imx8mp-fan-cooling-level-v1-1-59aae8fee2db@toradex.com>
Date: Fri, 13 Jun 2025 13:35:04 -0300
From: João Paulo Gonçalves <jpaulo.silvagoncalves@...il.com>
To: Rob Herring <robh@...nel.org>, Krzysztof Kozlowski <krzk+dt@...nel.org>, 
 Conor Dooley <conor+dt@...nel.org>, Shawn Guo <shawnguo@...nel.org>, 
 Sascha Hauer <s.hauer@...gutronix.de>, 
 Pengutronix Kernel Team <kernel@...gutronix.de>, 
 Fabio Estevam <festevam@...il.com>
Cc: devicetree@...r.kernel.org, imx@...ts.linux.dev, 
 linux-arm-kernel@...ts.infradead.org, linux-kernel@...r.kernel.org, 
 João Paulo Gonçalves <joao.goncalves@...adex.com>
Subject: [PATCH] arm64: dts: freescale: imx8mp-toradex-smarc: add fan
 cooling levels

From: João Paulo Gonçalves <joao.goncalves@...adex.com>

The fan controller on this board cannot work in automatic mode, and
requires software control, the reason is that it has no temperature
sensor connected.

Given that this board is a development kit and does not have any
specific fan, add a default single cooling level that would enable the
fan to spin with a 100% duty cycle, enabling a safe default.

Signed-off-by: João Paulo Gonçalves <joao.goncalves@...adex.com>
---
 arch/arm64/boot/dts/freescale/imx8mp-toradex-smarc-dev.dts | 1 +
 1 file changed, 1 insertion(+)

diff --git a/arch/arm64/boot/dts/freescale/imx8mp-toradex-smarc-dev.dts b/arch/arm64/boot/dts/freescale/imx8mp-toradex-smarc-dev.dts
index 55b8c5c14fb4f3e7407243760ac01b0aca0dacf5..5f233304cea747d3f04a748265f96696668c9d6b 100644
--- a/arch/arm64/boot/dts/freescale/imx8mp-toradex-smarc-dev.dts
+++ b/arch/arm64/boot/dts/freescale/imx8mp-toradex-smarc-dev.dts
@@ -213,6 +213,7 @@ fan_controller: fan@18 {
 		#pwm-cells = <2>;
 
 		fan {
+			cooling-levels = <255>;
 			pwms = <&fan_controller 40000 PWM_POLARITY_INVERTED>;
 		};
 	};

---
base-commit: 1a2ad59da68dd294f994efbf68c5d671f6b42fad
change-id: 20250613-tdx-smarc-imx8mp-fan-cooling-level-b67265ae2c49

Best regards,
-- 
João Paulo Gonçalves <joao.goncalves@...adex.com>