linux-kernel - Re: [PATCH 2/2] ARM: dts: sun8i-h3: Add UART1 pinctrl

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Date:   Sat, 27 Aug 2016 00:29:32 +0200
From:   Maxime Ripard <maxime.ripard@...e-electrons.com>
To:     Milo Kim <woogyom.kim@...il.com>
Cc:     Chen-Yu Tsai <wens@...e.org>,
        Thierry Reding <thierry.reding@...il.com>,
        devicetree@...r.kernel.org, linux-kernel@...r.kernel.org,
        Rob Herring <robh+dt@...nel.org>
Subject: Re: [PATCH 2/2] ARM: dts: sun8i-h3: Add UART1 pinctrl

Hi Milo,

On Fri, Aug 26, 2016 at 05:00:37PM +0900, Milo Kim wrote:
> On 08/26/2016 04:10 PM, Maxime Ripard wrote:
> >>+			uart1_pins_a: uart1@0 {
> >>> +				allwinner,pins = "PG6", "PG7";
> >>> +				allwinner,function = "uart1";
> >>> +				allwinner,drive = <SUN4I_PINCTRL_10_MA>;
> >>> +				allwinner,pull = <SUN4I_PINCTRL_NO_PULL>;
> >>> +			};
> >>> +
> >Our policy is that we don't introduce new pinctrl nodes that are not
> >used by any board to avoid bloating the DT too much with unused nodes.
> >
> >If you have a board using it, please submit that change as well.
> 
> OK, I agree.
> 
> However, this pinmux is only useful in case PA5 is assigned for PWM.
> PA5 is commonly used for UART0_RX, so I'd like to add UART1 node into *.dts
> and disable it (status = "disabled"). Does it make sense?

I guess UART1 is either used or not used on that board. In the former
case, it should be enabled, in the latter, left out of the DTS
entirely.

Maxime

-- 
Maxime Ripard, Free Electrons
Embedded Linux and Kernel engineering
http://free-electrons.com

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