linux-kernel - [PATCH] arm64: dts: mediatek: mt8183-kukui: Drop bogus output-enable property

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Date: Fri, 12 Apr 2024 15:56:12 +0800
From: Chen-Yu Tsai <wenst@...omium.org>
To: Matthias Brugger <matthias.bgg@...il.com>,
	AngeloGioacchino Del Regno <angelogioacchino.delregno@...labora.com>
Cc: Chen-Yu Tsai <wenst@...omium.org>,
	Rob Herring <robh@...nel.org>,
	Krzysztof Kozlowski <krzk+dt@...nel.org>,
	Conor Dooley <conor+dt@...nel.org>,
	devicetree@...r.kernel.org,
	linux-kernel@...r.kernel.org,
	linux-arm-kernel@...ts.infradead.org,
	linux-mediatek@...ts.infradead.org
Subject: [PATCH] arm64: dts: mediatek: mt8183-kukui: Drop bogus output-enable property

The "output-enable" property is set on uart1's RTS pin. This is bogus
because the hardware does not actually have a controllable output
buffer. Secondly, the implementation incorrectly treats this property
as a request to switch the pin to GPIO output. This does not fit the
intended semantic of "output-enable" and it does not have any affect
either because the pin is muxed to the UART function, not the GPIO
function.

Drop the property.

Fixes: cd894e274b74 ("arm64: dts: mt8183: Add krane-sku176 board")
Signed-off-by: Chen-Yu Tsai <wenst@...omium.org>
---
 arch/arm64/boot/dts/mediatek/mt8183-kukui.dtsi | 2 --
 1 file changed, 2 deletions(-)

diff --git a/arch/arm64/boot/dts/mediatek/mt8183-kukui.dtsi b/arch/arm64/boot/dts/mediatek/mt8183-kukui.dtsi
index f934b8aad3ed..75c799a6adb4 100644
--- a/arch/arm64/boot/dts/mediatek/mt8183-kukui.dtsi
+++ b/arch/arm64/boot/dts/mediatek/mt8183-kukui.dtsi
@@ -797,7 +797,6 @@ pins-tx {
 		};
 		pins-rts {
 			pinmux = <PINMUX_GPIO47__FUNC_URTS1>;
-			output-enable;
 		};
 		pins-cts {
 			pinmux = <PINMUX_GPIO46__FUNC_UCTS1>;
@@ -816,7 +815,6 @@ pins-tx {
 		};
 		pins-rts {
 			pinmux = <PINMUX_GPIO47__FUNC_URTS1>;
-			output-enable;
 		};
 		pins-cts {
 			pinmux = <PINMUX_GPIO46__FUNC_UCTS1>;
-- 
2.44.0.683.g7961c838ac-goog