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

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Message-ID: <20260114105005.3136045-1-giulio.benetti@benettiengineering.com>
Date: Wed, 14 Jan 2026 11:50:04 +0100
From: Giulio Benetti <giulio.benetti@...ettiengineering.com>
To: Rob Herring <robh@...nel.org>,
	Krzysztof Kozlowski <krzk+dt@...nel.org>,
	Conor Dooley <conor+dt@...nel.org>,
	Chen-Yu Tsai <wens@...nel.org>,
	Jernej Skrabec <jernej.skrabec@...il.com>,
	Samuel Holland <samuel@...lland.org>,
	Giulio Benetti <giulio.benetti@...ettiengineering.com>,
	devicetree@...r.kernel.org,
	linux-arm-kernel@...ts.infradead.org,
	linux-sunxi@...ts.linux.dev,
	linux-kernel@...r.kernel.org
Subject: [PATCH] ARM: dts: sun7i: a20: fix MMC index enumeration

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.

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