linux-kernel - [PATCH 1/9] arm64: dts: rockchip: enable UART5 on RK3588 Tiger Haikou

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Message-Id: <20250218-tsd-align-haikou-v1-1-5c44d1dd8658@cherry.de>
Date: Tue, 18 Feb 2025 12:49:12 +0100
From: Quentin Schulz <foss+kernel@...il.net>
To: Rob Herring <robh@...nel.org>, Krzysztof Kozlowski <krzk+dt@...nel.org>, 
 Conor Dooley <conor+dt@...nel.org>, Heiko Stuebner <heiko@...ech.de>
Cc: devicetree@...r.kernel.org, linux-arm-kernel@...ts.infradead.org, 
 linux-rockchip@...ts.infradead.org, linux-kernel@...r.kernel.org, 
 Quentin Schulz <quentin.schulz@...rry.de>
Subject: [PATCH 1/9] arm64: dts: rockchip: enable UART5 on RK3588 Tiger
 Haikou

From: Quentin Schulz <quentin.schulz@...rry.de>

In its default configuration (SW2 on "UART1"), UART5 is exposed on the
DB9 RS232/RS485 connector. While the same signals are also exposed on
Q7_GPIO5 and Q7_GPIO6, a GPIO header, and thus could be used for other
purposes, RK3399 Puma Haikou and PX30 Ringneck Haikou do enable the UART
controller exposed on the DB9 connector, so let's keep consistency
across our modules and enable it on RK3588 Tiger Haikou by default too.

Add a comment while at it to explicit where this controller is routed
to.

Signed-off-by: Quentin Schulz <quentin.schulz@...rry.de>
---
 arch/arm64/boot/dts/rockchip/rk3588-tiger-haikou.dts | 2 ++
 1 file changed, 2 insertions(+)

diff --git a/arch/arm64/boot/dts/rockchip/rk3588-tiger-haikou.dts b/arch/arm64/boot/dts/rockchip/rk3588-tiger-haikou.dts
index 3187b4918a300dae49fe05d760fb7e1fd55f14d5..7bd07e5026ed914063965c9f1ec6a29357b0c05d 100644
--- a/arch/arm64/boot/dts/rockchip/rk3588-tiger-haikou.dts
+++ b/arch/arm64/boot/dts/rockchip/rk3588-tiger-haikou.dts
@@ -310,8 +310,10 @@ &uart2 {
 	status = "okay";
 };
 
+/* DB9 RS232/RS485 when SW2 in "UART1" mode */
 &uart5 {
 	rts-gpios = <&gpio3 RK_PB3 GPIO_ACTIVE_HIGH>;
+	status = "okay";
 };
 
 &usbdp_phy0 {

-- 
2.48.1