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

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Message-ID: <9fca977f-4179-44de-b0dd-8e68d57addd4@benettiengineering.com>
Date: Wed, 14 Jan 2026 18:50:56 +0100
From: Giulio Benetti <giulio.benetti@...ettiengineering.com>
To: wens@...nel.org
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 1/14/26 15:07, Chen-Yu Tsai wrote:
> 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.

I see, thank you for taking care.

Best regards
Giulio

> 
> 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
>>
>>