[PATCH 02/15] arm64: dts: mediatek: mt7981b-openwrt-one: Configure UART0 pinmux

[AngeloGioacchino Del Regno]

Il 16/10/25 14:38, Daniel Golle ha scritto:
> On Thu, Oct 16, 2025 at 12:08:38PM +0200, Sjoerd Simons wrote:
>> Add explicit pinctrl configuration for UART0 on the OpenWrt One board,
>>
>> Signed-off-by: Sjoerd Simons <sjoerd at collabora.com>
>> ---
>>   arch/arm64/boot/dts/mediatek/mt7981b-openwrt-one.dts | 11 +++++++++++
>>   1 file changed, 11 insertions(+)
>>
>> diff --git a/arch/arm64/boot/dts/mediatek/mt7981b-openwrt-one.dts b/arch/arm64/boot/dts/mediatek/mt7981b-openwrt-one.dts
>> index 968b91f55bb27..f836059d7f475 100644
>> --- a/arch/arm64/boot/dts/mediatek/mt7981b-openwrt-one.dts
>> +++ b/arch/arm64/boot/dts/mediatek/mt7981b-openwrt-one.dts
>> @@ -22,6 +22,17 @@ memory at 40000000 {
>>   	};
>>   };
>>   
>> +&pio {
>> +	uart0_pins: uart0-pins {
>> +		mux {
>> +			function = "uart";
>> +			groups = "uart0";
>> +		};
>> +	};
>> +};
>> +
>>   &uart0 {
>> +	pinctrl-names = "default";
>> +	pinctrl-0 = <&uart0_pins>;
>>   	status = "okay";
>>   };
> 
> As there is only a single possible pinctrl configuration for uart0,
> both the pinmux definition as well as the pinctrl properties should go
> into mt7981b.dtsi rather than in the board's dts.

If there's really one single possible pin configuration for the UART0 pins,
as in, those pins *do not* have a GPIO mode, then yes I agree.

If those pins can be as well configured as GPIOs, this goes to board DTS.

Cheers,
Angelo