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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 uart5. Which means GPIO0_B5 is implemented as rs485 rx-enable gpio. In full-duplex mode (em485 is disabled), DE is connected to GPIO0_B5 and RE is grounded (active). This requires rx-enable gpio to be inactive to enable DE as well. Signed-off-by: Farouk Bouabid --- arch/arm64/boot/dts/rockchip/px30-ringneck-haikou.dts | 2 ++ 1 file changed, 2 insertions(+) diff --git a/arch/arm64/boot/dts/rockchip/px30-ringneck-haikou.dts b/arch/arm64/boot/dts/rockchip/px30-ringneck-haikou.dts index 16798eb77077..369a6518a487 100644 --- a/arch/arm64/boot/dts/rockchip/px30-ringneck-haikou.dts +++ b/arch/arm64/boot/dts/rockchip/px30-ringneck-haikou.dts @@ -227,6 +227,8 @@ &uart0 { &uart5 { pinctrl-0 = <&uart5_xfer>; + rs485-rx-enable-gpios = <&gpio0 RK_PB5 GPIO_ACTIVE_LOW>; + rs485-rx-enable-inactive-when-rs485-disabled; status = "okay"; };