linux-kernel - Re: [PATCH] ARM: dts: sun7i: a20: fix MMC index enumeration

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Message-ID: <CAGb2v66gpmreQiDMDJ8NE1QJ-e+iBUVicw9sv=RgiwuONfUFAA@mail.gmail.com>
Date: Wed, 14 Jan 2026 22:07:16 +0800
From: Chen-Yu Tsai <wens@...nel.org>
To: Giulio Benetti <giulio.benetti@...ettiengineering.com>
Cc: Rob Herring <robh@...nel.org>, Krzysztof Kozlowski <krzk+dt@...nel.org>, 
	Conor Dooley <conor+dt@...nel.org>, Jernej Skrabec <jernej.skrabec@...il.com>, 
	Samuel Holland <samuel@...lland.org>, devicetree@...r.kernel.org, 
	linux-arm-kernel@...ts.infradead.org, linux-sunxi@...ts.linux.dev, 
	linux-kernel@...r.kernel.org
Subject: Re: [PATCH] ARM: dts: sun7i: a20: fix MMC index enumeration

On Wed, Jan 14, 2026 at 6:50 PM Giulio Benetti
<giulio.benetti@...ettiengineering.com> wrote:
>
> Currently, the OLinuXino-A20-Micro experiences non-deterministic MMC
> enumeration during boot. When both an SDIO WiFi module (MMC1) and
> an SD card (MMC0) are present, the kernel may swap their indices.
>
> Explicitly define mmc* aliases to ensure consistent device naming
> and prevent mapping conflicts.

Years ago we (sunxi maintainers) decided against this.

> Signed-off-by: Giulio Benetti <giulio.benetti@...ettiengineering.com>
> ---
>  arch/arm/boot/dts/allwinner/sun7i-a20.dtsi | 4 ++++

And aliases are per board, so this definitely doesn't belong here.


ChenYu

>  1 file changed, 4 insertions(+)
>
> diff --git a/arch/arm/boot/dts/allwinner/sun7i-a20.dtsi b/arch/arm/boot/dts/allwinner/sun7i-a20.dtsi
> index 5f44f09c5545..a958400bcd7c 100644
> --- a/arch/arm/boot/dts/allwinner/sun7i-a20.dtsi
> +++ b/arch/arm/boot/dts/allwinner/sun7i-a20.dtsi
> @@ -55,6 +55,10 @@ / {
>         #size-cells = <1>;
>
>         aliases {
> +               mmc0 = &mmc0;
> +               mmc1 = &mmc1;
> +               mmc2 = &mmc2;
> +               mmc3 = &mmc3;
>                 ethernet0 = &gmac;
>         };
>
> --
> 2.47.3
>
>