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Switching to the half-duplex mode requires the user to enable em485 on uart5 using ioctl, DE/RE are both connected to GPIO2_C3 which is the RTS signal for uart0. Implement GPIO2_C3 as rts-gpios with RTS_ON_SEND option enabled (default) so that driver mode gets enabled while sending (RTS high) and receiver mode gets enabled while not sending (RTS low). In full-duplex mode (em485 is disabled), DE is connected to GPIO2_C3 and RE is grounded (enabled). Since GPIO2_C3 is implemented as rts-gpios, the driver mode gets enabled whenever we want to send something and RE is not affected (always enabled) in this case by the state of RTS. Signed-off-by: Farouk Bouabid --- arch/arm64/boot/dts/rockchip/rk3399-puma-haikou.dts | 3 ++- 1 file changed, 2 insertions(+), 1 deletion(-) diff --git a/arch/arm64/boot/dts/rockchip/rk3399-puma-haikou.dts b/arch/arm= 64/boot/dts/rockchip/rk3399-puma-haikou.dts index 18a98c4648ea..2c3984a880af 100644 --- a/arch/arm64/boot/dts/rockchip/rk3399-puma-haikou.dts +++ b/arch/arm64/boot/dts/rockchip/rk3399-puma-haikou.dts @@ -273,11 +273,12 @@ &u2phy0_host { =20 &uart0 { pinctrl-names =3D "default"; - pinctrl-0 =3D <&uart0_xfer &uart0_cts &uart0_rts>; + pinctrl-0 =3D <&uart0_xfer>; status =3D "okay"; }; =20 &uart2 { + rts-gpios =3D <&gpio2 RK_PC3 GPIO_ACTIVE_HIGH>; status =3D "okay"; }; =20 --=20 2.34.1 From nobody Sun Feb 8 20:48:44 2026 Received: from EUR05-AM6-obe.outbound.protection.outlook.com (mail-am6eur05on2098.outbound.protection.outlook.com [40.107.22.98]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by smtp.subspace.kernel.org (Postfix) with ESMTPS id 22F047CF1B; 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Switching to the half-duplex mode requires the user to enable em485 on uart5 using ioctl, DE/RE are both connected to GPIO0_B5 which is the RTS signal for uart0. Implement GPIO0_B5 as rts-gpios with RTS_ON_SEND option enabled (default) so that driver mode gets enabled while sending (RTS high) and receiver mode gets enabled while not sending (RTS low). In full-duplex mode (em485 is disabled), DE is connected to GPIO0_B5 and RE is grounded (enabled). Since GPIO0_B5 is implemented as rts-gpios, the driver mode gets enabled whenever we want to send something and RE is not affected (always enabled) in this case by the state of RTS. Signed-off-by: Farouk Bouabid --- arch/arm64/boot/dts/rockchip/px30-ringneck-haikou.dts | 1 + 1 file changed, 1 insertion(+) diff --git a/arch/arm64/boot/dts/rockchip/px30-ringneck-haikou.dts b/arch/a= rm64/boot/dts/rockchip/px30-ringneck-haikou.dts index 16798eb77077..ae398acdcf45 100644 --- a/arch/arm64/boot/dts/rockchip/px30-ringneck-haikou.dts +++ b/arch/arm64/boot/dts/rockchip/px30-ringneck-haikou.dts @@ -227,6 +227,7 @@ &uart0 { =20 &uart5 { pinctrl-0 =3D <&uart5_xfer>; + rts-gpios =3D <&gpio0 RK_PB5 GPIO_ACTIVE_HIGH>; status =3D "okay"; }; =20 --=20 2.34.1