linux-kernel - [PATCH] arm64: dts: rockchip: Fix eMMC HS200 mode on Radxa E20C

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Message-ID: <20250621165832.2226160-1-jonas@kwiboo.se>
Date: Sat, 21 Jun 2025 16:58:30 +0000
From: Jonas Karlman <jonas@...boo.se>
To: Heiko Stuebner <heiko@...ech.de>,
	Rob Herring <robh@...nel.org>,
	Krzysztof Kozlowski <krzk+dt@...nel.org>,
	Conor Dooley <conor+dt@...nel.org>,
	Jonas Karlman <jonas@...boo.se>
Cc: devicetree@...r.kernel.org,
	linux-arm-kernel@...ts.infradead.org,
	linux-rockchip@...ts.infradead.org,
	linux-kernel@...r.kernel.org
Subject: [PATCH] arm64: dts: rockchip: Fix eMMC HS200 mode on Radxa E20C

eMMC HS200 mode (1.8V I/O) is supported by the MMC host controller on
RK3528 and works with the optional on-board eMMC module on Radxa E20C.

Be explicit about HS200 support in the device tree for Radxa E20C.

Fixes: 3a01b5f14a8a ("arm64: dts: rockchip: Enable onboard eMMC on Radxa E20C")
Signed-off-by: Jonas Karlman <jonas@...boo.se>
---
This also help assist boot firmware that consume Linux device tree's to
use HS200 mode when booting from eMMC, see [1] for a related U-Boot fix.

[1] https://source.denx.de/u-boot/u-boot/-/commit/f8cb3fde935ed003ad1d7cf6a06d59586fe65cd5
---
 arch/arm64/boot/dts/rockchip/rk3528-radxa-e20c.dts | 1 +
 1 file changed, 1 insertion(+)

diff --git a/arch/arm64/boot/dts/rockchip/rk3528-radxa-e20c.dts b/arch/arm64/boot/dts/rockchip/rk3528-radxa-e20c.dts
index e4333674a0ec..12eec2c1db22 100644
--- a/arch/arm64/boot/dts/rockchip/rk3528-radxa-e20c.dts
+++ b/arch/arm64/boot/dts/rockchip/rk3528-radxa-e20c.dts
@@ -283,6 +283,7 @@ &saradc {
 &sdhci {
 	bus-width = <8>;
 	cap-mmc-highspeed;
+	mmc-hs200-1_8v;
 	no-sd;
 	no-sdio;
 	non-removable;
-- 
2.49.0