linux-kernel - [PATCH 1/1] riscv: dts: starfive: Milk-V Mars CM Lite broken-cd

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Message-ID: <20260204101602.30184-1-heinrich.schuchardt@canonical.com>
Date: Wed,  4 Feb 2026 11:16:02 +0100
From: Heinrich Schuchardt <heinrich.schuchardt@...onical.com>
To: Emil Renner Berthing <kernel@...il.dk>,
	Conor Dooley <conor@...nel.org>
Cc: Rob Herring <robh@...nel.org>,
	Krzysztof Kozlowski <krzk+dt@...nel.org>,
	Paul Walmsley <pjw@...nel.org>,
	Palmer Dabbelt <palmer@...belt.com>,
	Albert Ou <aou@...s.berkeley.edu>,
	Alexandre Ghiti <alex@...ti.fr>,
	E Shattow <e@...eshell.de>,
	linux-riscv@...ts.infradead.org,
	devicetree@...r.kernel.org,
	linux-kernel@...r.kernel.org,
	Heinrich Schuchardt <heinrich.schuchardt@...onical.com>
Subject: [PATCH 1/1] riscv: dts: starfive: Milk-V Mars CM Lite broken-cd

The card detect GPIO depends on support by the base board.

Detecting an SD-card did not work for me with a Milk-V Mars CM Lite
mounted on an Waveshare CM4-IO-BASE-A board.

According to [1] SD_SDIO0_CD_GPIO41 is connected to pin 76 reserved.
The Raspberry Pi Compute Module 4 IO Board documentation marks that pin as
reserved. The Raspberry Pi Compute Module 5 IO Board documentation
marks the pin as VBAT.

Remove the cd-gpios definition and add broken-cd.

[1]  https://github.com/milkv-mars/mars-files/blob/main/Mars-CM_Hardware_Schematices/Milk-V_Mars-CM_SCH_V1.0-2023-0905_Lite.pdf

Signed-off-by: Heinrich Schuchardt <heinrich.schuchardt@...onical.com>
---
 arch/riscv/boot/dts/starfive/jh7110-milkv-marscm-lite.dts | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/arch/riscv/boot/dts/starfive/jh7110-milkv-marscm-lite.dts b/arch/riscv/boot/dts/starfive/jh7110-milkv-marscm-lite.dts
index 63aa94d65ab55..566b0bdc2800d 100644
--- a/arch/riscv/boot/dts/starfive/jh7110-milkv-marscm-lite.dts
+++ b/arch/riscv/boot/dts/starfive/jh7110-milkv-marscm-lite.dts
@@ -13,7 +13,7 @@ / {
 
 &mmc0 {
 	bus-width = <4>;
-	cd-gpios = <&sysgpio 41 GPIO_ACTIVE_LOW>;
+	broken-cd;
 	disable-wp;
 };
 
-- 
2.51.0