linux-kernel - Re: [PATCH v2] arm64: dts: mt8173: elm: Use aliases to mmc nodes

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Date:   Mon, 26 Jul 2021 18:40:47 +0800
From:   Chen-Yu Tsai <wenst@...omium.org>
To:     Hsin-Yi Wang <hsinyi@...omium.org>
Cc:     Matthias Brugger <matthias.bgg@...il.com>,
        Rob Herring <robh+dt@...nel.org>,
        Enric Balletbo Serra <eballetbo@...il.com>,
        Eizan Miyamoto <eizan@...omium.org>,
        Devicetree List <devicetree@...r.kernel.org>,
        "moderated list:ARM/FREESCALE IMX / MXC ARM ARCHITECTURE" 
        <linux-arm-kernel@...ts.infradead.org>,
        "moderated list:ARM/Mediatek SoC support" 
        <linux-mediatek@...ts.infradead.org>,
        LKML <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH v2] arm64: dts: mt8173: elm: Use aliases to mmc nodes

Hi,

On Mon, Jul 26, 2021 at 6:25 PM Hsin-Yi Wang <hsinyi@...omium.org> wrote:
>
> Use aliases to mmc nodes so the partition name for eMMC and SD card will
> be consistent across boots.

To be honest I think this deserves a bit more pretext:

There used to be no way to specify the order of MMC controllers, and
the numbering was based on how the implementations added the devices.
For Linux, this changed when asynchronous probing was enabled for most
drivers, resulting in mmc device numbers jumping around.

With commit 1796164fac7e ("dt-bindings: mmc: document alias support"),
a way to specify fixed index numbers was provided.

Otherwise,

Reviewed-by: Chen-Yu Tsai <wenst@...omium.org>

Same for the mt8183-kukui patch.

> Signed-off-by: Hsin-Yi Wang <hsinyi@...omium.org>
> ---
> v1->v2: skip unused mmc2.
> ---
>  arch/arm64/boot/dts/mediatek/mt8173-elm.dtsi | 6 ++++++
>  1 file changed, 6 insertions(+)
>
> diff --git a/arch/arm64/boot/dts/mediatek/mt8173-elm.dtsi b/arch/arm64/boot/dts/mediatek/mt8173-elm.dtsi
> index 21452c51a20a8..d5a2cad39c9c7 100644
> --- a/arch/arm64/boot/dts/mediatek/mt8173-elm.dtsi
> +++ b/arch/arm64/boot/dts/mediatek/mt8173-elm.dtsi
> @@ -10,6 +10,12 @@
>  #include "mt8173.dtsi"
>
>  / {
> +       aliases {
> +               mmc0 = &mmc0;
> +               mmc1 = &mmc1;
> +               mmc2 = &mmc3;
> +       };
> +
>         memory@...00000 {
>                 device_type = "memory";
>                 reg = <0 0x40000000 0 0x80000000>;
> --
> 2.32.0.432.gabb21c7263-goog
>
>
> _______________________________________________
> Linux-mediatek mailing list
> Linux-mediatek@...ts.infradead.org
> http://lists.infradead.org/mailman/listinfo/linux-mediatek

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