linux-kernel - [PATCH 1/6] arm64: dts: amlogic: c3: assign the MMC signal clocks

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Message-Id: <20260114-amlogic-mmc-clocks-followup-v1-1-a999fafbe0aa@baylibre.com>
Date: Wed, 14 Jan 2026 18:08:48 +0100
From: Jerome Brunet <jbrunet@...libre.com>
To: Neil Armstrong <neil.armstrong@...aro.org>, 
 Kevin Hilman <khilman@...libre.com>, 
 Martin Blumenstingl <martin.blumenstingl@...glemail.com>, 
 Rob Herring <robh@...nel.org>, Krzysztof Kozlowski <krzk+dt@...nel.org>, 
 Conor Dooley <conor+dt@...nel.org>, Xianwei Zhao <xianwei.zhao@...ogic.com>, 
 Yixun Lan <yixun.lan@...ogic.com>, Nan Li <nan.li@...ogic.com>
Cc: linux-arm-kernel@...ts.infradead.org, linux-amlogic@...ts.infradead.org, 
 devicetree@...r.kernel.org, linux-kernel@...r.kernel.org, 
 Jerome Brunet <jbrunet@...libre.com>
Subject: [PATCH 1/6] arm64: dts: amlogic: c3: assign the MMC signal clocks

The amlogic MMC driver operate with the assumption that MMC clock
is configured to provide 24MHz. It uses this path for low
rates such as 400kHz.

Assign the clocks to make sure they are properly configured

Fixes: 520b792e8317 ("arm64: dts: amlogic: add some device nodes for C3")
Signed-off-by: Jerome Brunet <jbrunet@...libre.com>
---
 arch/arm64/boot/dts/amlogic/amlogic-c3.dtsi | 7 +++++++
 1 file changed, 7 insertions(+)

diff --git a/arch/arm64/boot/dts/amlogic/amlogic-c3.dtsi b/arch/arm64/boot/dts/amlogic/amlogic-c3.dtsi
index 11e5323f95b7..4e6757a57fb9 100644
--- a/arch/arm64/boot/dts/amlogic/amlogic-c3.dtsi
+++ b/arch/arm64/boot/dts/amlogic/amlogic-c3.dtsi
@@ -969,6 +969,10 @@ sdio: mmc@...00 {
 				no-sd;
 				resets = <&reset RESET_SD_EMMC_A>;
 				status = "disabled";
+
+				assigned-clocks = <&clkc_periphs CLKID_SD_EMMC_A>;
+				assigned-clock-rates = <24000000>;
+
 			};
 
 			sd: mmc@...00 {
@@ -984,6 +988,9 @@ sd: mmc@...00 {
 				no-sdio;
 				resets = <&reset RESET_SD_EMMC_B>;
 				status = "disabled";
+
+				assigned-clocks = <&clkc_periphs CLKID_SD_EMMC_B>;
+				assigned-clock-rates = <24000000>;
 			};
 
 			nand: nand-controller@...00 {

-- 
2.47.3