linux-kernel - Re: [PATCH V3 4/4] arm64: dts: qcom: sm8550: Remove SDR104/SDR50 broken capabilities

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Message-ID: <5336c00d-3b80-423a-bb52-4e1ec35bc7ed@kernel.org>
Date: Wed, 18 Jun 2025 09:41:11 +0200
From: Krzysztof Kozlowski <krzk@...nel.org>
To: Sarthak Garg <quic_sartgarg@...cinc.com>,
 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_cang@...cinc.com, 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
Subject: Re: [PATCH V3 4/4] arm64: dts: qcom: sm8550: Remove SDR104/SDR50
 broken capabilities

On 18/06/2025 09:28, Sarthak Garg wrote:
> Kernel now handles all level shifter limitations related to SD card
> modes.
> As a result, the broken hardware capabilities for SDR104 and SDR50 modes
> can be removed from the device tree.
> Additionally, due to level shifter constraints, set the maximum
> frequency for High Speed (HS) mode to 37.5 MHz using the
> max-sd-hs-frequency property for sm8550.
> 
> Signed-off-by: Sarthak Garg <quic_sartgarg@...cinc.com>
> ---
>  arch/arm64/boot/dts/qcom/sm8550.dtsi | 4 +---
>  1 file changed, 1 insertion(+), 3 deletions(-)
> 
> diff --git a/arch/arm64/boot/dts/qcom/sm8550.dtsi b/arch/arm64/boot/dts/qcom/sm8550.dtsi
> index 82cabf777cd2..2c770c979d39 100644
> --- a/arch/arm64/boot/dts/qcom/sm8550.dtsi
> +++ b/arch/arm64/boot/dts/qcom/sm8550.dtsi
> @@ -3180,6 +3180,7 @@ sdhc_2: mmc@...4000 {
>  			iommus = <&apps_smmu 0x540 0>;
>  			qcom,dll-config = <0x0007642c>;
>  			qcom,ddr-config = <0x80040868>;
> +			max-sd-hs-frequency = <37500000>;
So my previous comments stay... This is SoC thus deducible from compatible.

Best regards,
Krzysztof