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

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Date:   Thu, 19 Oct 2017 16:02:00 +0000
From:   Joonas Kylmälä <joonas.kylmala@....fi>
To:     Chen-Yu Tsai <wens@...e.org>
Cc:     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

Chen-Yu Tsai:
>> 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.

Alright. So could we then make similar patches for other SoCs that have
the same situation with the MMC pinmuxing? I.e. let's move the pinctrl
to the dtsi file from the dts files. With H3 SDC0 and SDC1 nodes could
be moved then to the dtsi. Can't we also move the SDC0 pinctrl in A83T
to the dtsi file? Though, in order to do that mmc0_cd_pin node needs to
be added to the A38T dtsi.

Joonas