linux-kernel - Re: [PATCH 08/10] ARM: sun7i: DT: Add UART muxing options to the DTSI

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Date:	Tue, 30 Jul 2013 23:07:21 +0400
From:	Sergei Shtylyov <sergei.shtylyov@...entembedded.com>
To:	Maxime Ripard <maxime.ripard@...e-electrons.com>
CC:	linux-arm-kernel@...ts.infradead.org,
	Emilio Lopez <emilio@...pez.com.ar>,
	linux-kernel@...r.kernel.org, linux-sunxi@...glegroups.com,
	kevin.z.m.zh@...il.com, sunny@...winnertech.com,
	shuge@...winnertech.com
Subject: Re: [PATCH 08/10] ARM: sun7i: DT: Add UART muxing options to the
 DTSI

Hello.

On 07/30/2013 06:59 PM, Maxime Ripard wrote:

> The UARTs on the A20 can be muxed to several pins. Add a few options to
> the DTSI so that we can start using them in the boards' DT.

> Signed-off-by: Maxime Ripard <maxime.ripard@...e-electrons.com>
> ---
>   arch/arm/boot/dts/sun7i-a20.dtsi | 21 +++++++++++++++++++++
>   1 file changed, 21 insertions(+)

> diff --git a/arch/arm/boot/dts/sun7i-a20.dtsi b/arch/arm/boot/dts/sun7i-a20.dtsi
> index 704fca9..9f45e8d 100644
> --- a/arch/arm/boot/dts/sun7i-a20.dtsi
> +++ b/arch/arm/boot/dts/sun7i-a20.dtsi
> @@ -70,6 +70,27 @@
>   			#address-cells = <1>;
>   			#size-cells = <0>;
>   			#gpio-cells = <3>;
> +
> +			uart0_pins_a: uart0@0 {

    Why have address part of the node name if there's not "reg" property?
And the preferred node name is "serial", not "uart", according to the ePAPR 
spec (http://www.power.org/resources/downloads/Power_ePAPR_APPROVED_v1.0.pdf).

> +				allwinner,pins = "PB22", "PB23";
> +				allwinner,function = "uart0";
> +				allwinner,drive = <0>;
> +				allwinner,pull = <0>;
> +			};
> +
> +			uart6_pins_a: uart6@0 {
> +				allwinner,pins = "PI12", "PI13";
> +				allwinner,function = "uart6";
> +				allwinner,drive = <0>;
> +				allwinner,pull = <0>;
> +			};
> +
> +			uart7_pins_a: uart7@0 {
> +				allwinner,pins = "PI20", "PI21";
> +				allwinner,function = "uart7";
> +				allwinner,drive = <0>;
> +				allwinner,pull = <0>;
> +			};

WBR, Sergei

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