linux-kernel - [PATCH 5/7] arm64: zynqmp: Fix pwm-fan polarity

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Message-ID: <e6dc9ce1e0b97c9d9b073c323cc94a5d7a88b94a.1752835502.git.michal.simek@amd.com>
Date: Fri, 18 Jul 2025 12:45:10 +0200
From: Michal Simek <michal.simek@....com>
To: <linux-kernel@...r.kernel.org>, <monstr@...str.eu>,
	<michal.simek@...inx.com>, <git@...inx.com>
CC: Vishal Patel <vishal.patel@....com>, Conor Dooley <conor+dt@...nel.org>,
	Krzysztof Kozlowski <krzk+dt@...nel.org>, Rob Herring <robh@...nel.org>,
	"open list:OPEN FIRMWARE AND FLATTENED DEVICE TREE BINDINGS"
	<devicetree@...r.kernel.org>, "moderated list:ARM/ZYNQ ARCHITECTURE"
	<linux-arm-kernel@...ts.infradead.org>
Subject: [PATCH 5/7] arm64: zynqmp: Fix pwm-fan polarity

From: Vishal Patel <vishal.patel@....com>

The correct operating mode for the fan is inversed (1). The previous pwm
driver implementation had a bug and the polarity information was propagated
incorrectly to the kernel. The normal (0) polarity specified in the device
tree was incorrectly clearing the polarity bit in the counter control
register. After the bug fix, setting the polarity to inversed (1) in the
device tree will clear the polarity bit.
Also provide label for custom description based on this SOM.

Signed-off-by: Vishal Patel <vishal.patel@....com>
Signed-off-by: Michal Simek <michal.simek@....com>
---

 arch/arm64/boot/dts/xilinx/zynqmp-sm-k26-revA.dts | 4 ++--
 1 file changed, 2 insertions(+), 2 deletions(-)

diff --git a/arch/arm64/boot/dts/xilinx/zynqmp-sm-k26-revA.dts b/arch/arm64/boot/dts/xilinx/zynqmp-sm-k26-revA.dts
index 51778df5540c..500af1d2232f 100644
--- a/arch/arm64/boot/dts/xilinx/zynqmp-sm-k26-revA.dts
+++ b/arch/arm64/boot/dts/xilinx/zynqmp-sm-k26-revA.dts
@@ -90,10 +90,10 @@ ds36-led {
 		};
 	};
 
-	pwm-fan {
+	pwm_fan: pwm-fan {
 		compatible = "pwm-fan";
 		status = "okay";
-		pwms = <&ttc0 2 40000 0>;
+		pwms = <&ttc0 2 40000 1>;
 	};
 };
 
-- 
2.43.0