linux-kernel - Re: [PATCH V2 1/2] dt-bindings: mmc: sdhci-msm: Add new compatible string for sdcdc10 DLL

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Message-ID: <20181012204848.GA30953@bogus>
Date:   Fri, 12 Oct 2018 15:48:48 -0500
From:   Rob Herring <robh@...nel.org>
To:     Veerabhadrarao Badiganti <vbadigan@...eaurora.org>
Cc:     adrian.hunter@...el.com, ulf.hansson@...aro.org,
        evgreen@...omium.org, dianders@...gle.com, asutoshd@...eaurora.org,
        riteshh@...eaurora.org, stummala@...eaurora.org,
        sayalil@...eaurora.org, linux-mmc@...r.kernel.org,
        linux-arm-msm@...r.kernel.org, Mark Rutland <mark.rutland@....com>,
        "open list:OPEN FIRMWARE AND FLATTENED DEVICE TREE BINDINGS" 
        <devicetree@...r.kernel.org>,
        open list <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH V2 1/2] dt-bindings: mmc: sdhci-msm: Add new compatible
 string for sdcdc10 DLL

On Mon, Oct 08, 2018 at 06:55:37PM +0530, Veerabhadrarao Badiganti wrote:
> On the SDHC-MSM controllers which makes use of sdcdc10 variant DLLs,
> the DLL configuration needs to be restored whenever controller clocks
> are gated. This new compatible string denotes the sdhc-msm controller
> variant which uses sdcdc10 DLL.

What is sdcdc10 DLL? 

Seems like a work-around to not having SoC specific compatible strings.

> 
> Signed-off-by: Veerabhadrarao Badiganti <vbadigan@...eaurora.org>
> ---
>  Documentation/devicetree/bindings/mmc/sdhci-msm.txt | 4 ++++
>  1 file changed, 4 insertions(+)
> 
> diff --git a/Documentation/devicetree/bindings/mmc/sdhci-msm.txt b/Documentation/devicetree/bindings/mmc/sdhci-msm.txt
> index 3720385..49b0a43 100644
> --- a/Documentation/devicetree/bindings/mmc/sdhci-msm.txt
> +++ b/Documentation/devicetree/bindings/mmc/sdhci-msm.txt
> @@ -6,7 +6,11 @@ and the properties used by the sdhci-msm driver.
>  Required properties:
>  - compatible: Should contain:
>  		"qcom,sdhci-msm-v4" for sdcc versions less than 5.0
> +		"qcom,sdhci-msm-v4-sdcdc10" for sdcc versions < 5.0 and
> +		which makes use of sdcdc10 variant DLLs.
>  		"qcom,sdhci-msm-v5" for sdcc versions >= 5.0
> +		"qcom,sdhci-msm-v5-sdcdc10" for sdcc versions >= 5.0 and
> +		which makes use of sdcdc10 variant DLLs.
>  		For SDCC version 5.0.0, MCI registers are removed from SDCC
>  		interface and some registers are moved to HC. New compatible
>  		string is added to support this change - "qcom,sdhci-msm-v5".
> -- 
> Qualcomm India Private Limited, on behalf of Qualcomm Innovation Center, Inc.
> Qualcomm Innovation Center, Inc. is a member of Code Aurora Forum, a Linux Foundation Collaborative Project.
>