From mboxrd@z Thu Jan 1 00:00:00 1970 Received: from smtp.kernel.org (aws-us-west-2-korg-mail-1.web.codeaurora.org [10.30.226.201]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by smtp.subspace.kernel.org (Postfix) with ESMTPS id A8A082AEE4; Fri, 1 Aug 2025 09:00:45 +0000 (UTC) Authentication-Results: smtp.subspace.kernel.org; arc=none smtp.client-ip=10.30.226.201 ARC-Seal:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1754038846; cv=none; b=Plig5JiNFLe92LzTpFrwxZi2j0svBs+9VMkxVURks8dA472VQywZA+2Lh5NatCoL2a70rgVoVEOchdc9OqL4+PzPj5jReNClfOhlktV07DMKZATSFCR7z4Mh3k7CMYe6AU7OE/CzfKCPnxXUcggqAai1qc7fDkc+ZJuBskPYRG0= ARC-Message-Signature:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1754038846; c=relaxed/simple; bh=3tgjkleCScnfgdzhTua0mmKjP9FXf9xN4KNZz5k2+kU=; h=Message-ID:Date:MIME-Version:Subject:To:Cc:References:From: In-Reply-To:Content-Type; b=QzeURxQCjfPlEuE/03kjGwbnc8YVwWqZSYcxXl7tZJJUjj2GQy9eNskGpgD1tRgWZnli0lQFDSO9iq8z4lq7nZQBn2sGJUi8LqDo6tgQcPu4o07RVWg+VOBO4cZeb6vx9k3OcD7xiOwgajuTwabKsddSr0bxLKn2JUQnkId3lFM= ARC-Authentication-Results:i=1; smtp.subspace.kernel.org; dkim=pass (2048-bit key) header.d=kernel.org header.i=@kernel.org header.b=ACobMMPC; arc=none smtp.client-ip=10.30.226.201 Authentication-Results: smtp.subspace.kernel.org; dkim=pass (2048-bit key) header.d=kernel.org header.i=@kernel.org header.b="ACobMMPC" Received: by smtp.kernel.org (Postfix) with ESMTPSA id BF5E1C4CEE7; Fri, 1 Aug 2025 09:00:40 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=kernel.org; s=k20201202; t=1754038845; bh=3tgjkleCScnfgdzhTua0mmKjP9FXf9xN4KNZz5k2+kU=; h=Date:Subject:To:Cc:References:From:In-Reply-To:From; b=ACobMMPCcRhLK1IjcDY5TFHYraC6/EORUTlrtz/h132d1ba+Z5+Oo6+fhjqiQRvBH LK4vthHeRhy/S0SrFLqnDEhHXJAhqI5uh7U5j5UZ4q7Qdo/d860/RY9BI72n1sX5qZ 4zfo+x1jo1Ua3UnmWNtdk39mcnQZH/9XGF91ZGcmb3MX/+v5wsDx9AcZY+1isHPbLj kokCKeMA9a6VKA6db4j++Lwq0TZHyLtdcx16VEEbYMS71opNb7X9SVZKKd/RJBmSTJ j22NUGeHI6OSNx/wPQcMw8TEE7yNouDxaH8bF0KryQkDc5cgnNJu2PC03uza6XKFxO v4h/2HRvp2B2Q== Message-ID: <98bd97cd-0d34-4bb6-869f-68feec1de68e@kernel.org> Date: Fri, 1 Aug 2025 11:00:39 +0200 Precedence: bulk X-Mailing-List: devicetree@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 User-Agent: Mozilla Thunderbird Subject: Re: [PATCH V4 2/4] dt-bindings: mmc: controller: Add max-sd-hs-frequency property To: Sarthak Garg , Ulf Hansson , Rob Herring , Krzysztof Kozlowski , Conor Dooley , Bjorn Andersson , Konrad Dybcio , Adrian Hunter Cc: linux-mmc@vger.kernel.org, devicetree@vger.kernel.org, linux-kernel@vger.kernel.org, linux-arm-msm@vger.kernel.org, quic_cang@quicinc.com, quic_nguyenb@quicinc.com, quic_rampraka@quicinc.com, quic_pragalla@quicinc.com, quic_sayalil@quicinc.com, quic_nitirawa@quicinc.com, quic_bhaskarv@quicinc.com, kernel@oss.qualcomm.com References: <20250801084518.2259767-1-quic_sartgarg@quicinc.com> <20250801084518.2259767-3-quic_sartgarg@quicinc.com> From: Krzysztof Kozlowski Content-Language: en-US Autocrypt: addr=krzk@kernel.org; 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charset=UTF-8 Content-Transfer-Encoding: 7bit On 01/08/2025 10:45, Sarthak Garg wrote: > Some platforms may require limiting the maximum frequency used in SD > High-Speed (HS) mode due to board-level hardware constraints. For > example, certain boards may include level shifters or other components > that cannot reliably operate at the default 50 MHz HS frequency. > > Introduce a new optional device tree property max-sd-hs-frequency to > limit the maximum frequency (in Hz) used for SD cards operating in > High-Speed (HS) mode. > > Signed-off-by: Sarthak Garg > --- > .../devicetree/bindings/mmc/mmc-controller-common.yaml | 10 ++++++++++ > 1 file changed, 10 insertions(+) > > diff --git a/Documentation/devicetree/bindings/mmc/mmc-controller-common.yaml b/Documentation/devicetree/bindings/mmc/mmc-controller-common.yaml > index 9a7235439759..6c2529b976d1 100644 > --- a/Documentation/devicetree/bindings/mmc/mmc-controller-common.yaml > +++ b/Documentation/devicetree/bindings/mmc/mmc-controller-common.yaml > @@ -93,6 +93,16 @@ properties: > minimum: 400000 > maximum: 384000000 > > + max-sd-hs-frequency: Use standard unit suffixes. s/frequency/hz/ > + $ref: /schemas/types.yaml#/definitions/uint32 > + description: | > + Maximum frequency (in Hz) to be used for SD cards operating in > + High-Speed (HS) mode. This is useful for board-specific limitations, > + such as level shifters or others where the card cannot reliably > + operate at the default 50 MHz HS frequency. Don't repeat constraints in free form text. default: