linux-kernel - Re: [PATCH V1 1/3] dt-bindings: mmc: qcom: Document level shifter flag for SD card

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Message-ID: <ba49151a-e32d-438d-8a2a-50840368a87c@quicinc.com>
Date: Tue, 20 May 2025 12:28:53 +0530
From: Sarthak Garg <quic_sartgarg@...cinc.com>
To: Krzysztof Kozlowski <krzk@...nel.org>
CC: Ulf Hansson <ulf.hansson@...aro.org>, Rob Herring <robh@...nel.org>,
        Krzysztof Kozlowski <krzk+dt@...nel.org>,
        Conor Dooley <conor+dt@...nel.org>,
        Adrian Hunter <adrian.hunter@...el.com>,
        Bhupesh Sharma
	<bhupesh.sharma@...aro.org>,
        <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_sachgupt@...cinc.com>, <quic_bhaskarv@...cinc.com>,
        <quic_narepall@...cinc.com>, <kernel@...cinc.com>
Subject: Re: [PATCH V1 1/3] dt-bindings: mmc: qcom: Document level shifter
 flag for SD card



On 11/7/2024 3:29 PM, Krzysztof Kozlowski wrote:
> On Thu, Nov 07, 2024 at 01:35:03PM +0530, Sarthak Garg wrote:
>> Introduce a flag to indicate if the Qualcomm platform has a level
>> shifter for SD cards. With level shifter addition some extra delay is
>> seen on RX data path leading to CRC errors. To compensate these delays
>> and avoid CRC errors below things needs to be done:
>>
>> 1) Enable tuning for SDR50 mode
>> 2) Limit HS mode frequency to 37.5MHz from 50MHz
>>
>> Add this flag for all targets with a level shifter to handle these
>> issues for SD card.
>>
>> Signed-off-by: Sarthak Garg <quic_sartgarg@...cinc.com>
>> ---
>>   Documentation/devicetree/bindings/mmc/sdhci-msm.yaml | 3 +++
>>   1 file changed, 3 insertions(+)
>>
> 
> This wasn't tested, so just short review - platform means SoC usually,
> so this looks SoC specific, thus implied by compatible.
>  > Best regards,
> Krzysztof
>

Sure will redesign this logic and use compatible in patch V2.