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
[off-list ref] wrote:

quoted

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.

quoted

Signed-off-by: Giulio Benetti <giulio.benetti@benettiengineering.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

quoted

  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