linux-kernel - Re: [PATCH] arm64: dts: mt8173: add aliases for mt8173 mmc device nodes

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Date:   Tue, 10 May 2022 09:59:29 +0200
From:   Arnd Bergmann <arnd@...db.de>
To:     Chen-Yu Tsai <wenst@...omium.org>
Cc:     Eizan Miyamoto <eizan@...omium.org>,
        LKML <linux-kernel@...r.kernel.org>,
        Matthias Brugger <matthias.bgg@...il.com>,
        Rob Herring <robh+dt@...nel.org>,
        DTML <devicetree@...r.kernel.org>,
        Linux ARM <linux-arm-kernel@...ts.infradead.org>,
        "moderated list:ARM/Mediatek SoC..." 
        <linux-mediatek@...ts.infradead.org>, Arnd Bergmann <arnd@...db.de>
Subject: Re: [PATCH] arm64: dts: mt8173: add aliases for mt8173 mmc device nodes

On Tue, May 10, 2022 at 9:36 AM Chen-Yu Tsai <wenst@...omium.org> wrote:
> On Tue, May 10, 2022 at 1:21 PM Eizan Miyamoto <eizan@...omium.org> wrote:
> >
> > Doing this makes them get enumerated in a deterministic order so that
> > the assigned name in /dev that the mmc devices get assigned is
> > consistent across reboots.
>
> Arnd, one of the soc maintainers asked folks not to do this:
>
> https://lore.kernel.org/all/CAK8P3a3_uO23Y0tyfdh26tmCVcyp6XM+ur0WUd4khGUoBb32Hw@mail.gmail.com/
>
> and subsequently all mmc aliases for Rockchip were moved to the board level.

Right, please move the aliases into the per-board dts files, and make sure
to only list the ones that are actually connected on a given machine.

> > See ead9f7d7ea9 ("arm64: dts: qcom: sc7180: Assign numbers to eMMC and
> > SD") for similar work.
>
> I don't know why it didn't happen for Qualcomm though.

It takes a while to get things consistent, need to have another look there.

      Arnd