linux-kernel - Re: [linux-sunxi] [PATCH v2 6/8] ARM: dts: sun8i: a83t: Move mmc1 pinctrl setting to dtsi file

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Message-ID: <CAGb2v64O+eyriHG-FirtPKo6hACfbV9JcJRUUZ+rY1QM2w_r1g@mail.gmail.com>
Date:   Thu, 19 Oct 2017 14:48:28 +0800
From:   Chen-Yu Tsai <wens@...e.org>
To:     Joonas Kylmälä <joonas.kylmala@....fi>
Cc:     Chen-Yu Tsai <wens@...e.org>, Lee Jones <lee.jones@...aro.org>,
        Maxime Ripard <maxime.ripard@...e-electrons.com>,
        linux-arm-kernel <linux-arm-kernel@...ts.infradead.org>,
        devicetree <devicetree@...r.kernel.org>,
        linux-kernel <linux-kernel@...r.kernel.org>,
        linux-sunxi <linux-sunxi@...glegroups.com>,
        Quentin Schulz <quentin.schulz@...e-electrons.com>
Subject: Re: [linux-sunxi] [PATCH v2 6/8] ARM: dts: sun8i: a83t: Move mmc1
 pinctrl setting to dtsi file

On Wed, Oct 18, 2017 at 11:00 PM, Joonas Kylmälä <joonas.kylmala@....fi> wrote:
> Hi,
>
> Chen-Yu Tsai:
>> mmc1 only has 1 possible pinmux setting.
>
> What if someone is using the MMC with bus width 1 and then using the
> remaining 3 pins for something else?

I would very much like to see such a design. Currently the devices
we see all follow Allwinner's reference design, with only minor
modifications. As such, mmc1 is used exclusively for connecting
SDIO-based WiFi modules.

If such a radical(?) design is done, the vendor can always add
a "mmc1-1bit-pins" setting and override the default.

ChenYu