linux-kernel - [PATCH V5 4/4] arm64: dts: qcom: sm8550: Add max-sd-hs-hz property

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Message-Id: <20250903080404.3260135-5-quic_sartgarg@quicinc.com>
Date: Wed,  3 Sep 2025 13:34:04 +0530
From: Sarthak Garg <quic_sartgarg@...cinc.com>
To: Ulf Hansson <ulf.hansson@...aro.org>, Rob Herring <robh@...nel.org>,
        Krzysztof Kozlowski <krzk+dt@...nel.org>,
        Conor Dooley <conor+dt@...nel.org>,
        Bjorn Andersson <andersson@...nel.org>,
        Konrad Dybcio <konradybcio@...nel.org>,
        Adrian Hunter <adrian.hunter@...el.com>
Cc: linux-mmc@...r.kernel.org, devicetree@...r.kernel.org,
        linux-kernel@...r.kernel.org, linux-arm-msm@...r.kernel.org,
        quic_nguyenb@...cinc.com, quic_rampraka@...cinc.com,
        quic_pragalla@...cinc.com, quic_sayalil@...cinc.com,
        quic_nitirawa@...cinc.com, quic_bhaskarv@...cinc.com,
        kernel@....qualcomm.com, Sarthak Garg <quic_sartgarg@...cinc.com>
Subject: [PATCH V5 4/4] arm64: dts: qcom: sm8550: Add max-sd-hs-hz property

Due to board-specific hardware constraints particularly related
to level shifter in this case the maximum frequency for SD High-Speed
(HS) mode must be limited to 37.5 MHz to ensure reliable operation of SD
card in HS mode.

This is achieved by introducing the `max-sd-hs-hz` property in the
device tree, allowing the controller to operate within safe frequency
limits for HS mode.

Signed-off-by: Sarthak Garg <quic_sartgarg@...cinc.com>
---
 arch/arm64/boot/dts/qcom/sm8550.dtsi | 1 +
 1 file changed, 1 insertion(+)

diff --git a/arch/arm64/boot/dts/qcom/sm8550.dtsi b/arch/arm64/boot/dts/qcom/sm8550.dtsi
index 82cabf777cd2..3692a3a49634 100644
--- a/arch/arm64/boot/dts/qcom/sm8550.dtsi
+++ b/arch/arm64/boot/dts/qcom/sm8550.dtsi
@@ -3189,6 +3189,7 @@ &mc_virt SLAVE_EBI1 QCOM_ICC_TAG_ALWAYS>,
 					 &config_noc SLAVE_SDCC_2 QCOM_ICC_TAG_ACTIVE_ONLY>;
 			interconnect-names = "sdhc-ddr", "cpu-sdhc";
 			bus-width = <4>;
+			max-sd-hs-hz = <37500000>;
 			dma-coherent;
 
 			/* Forbid SDR104/SDR50 - broken hw! */
-- 
2.34.1