linux-kernel - Re: [PATCH 1/2] dt-bindings: mmc: sdhci-msm: Add flag for restoring dll

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Date:   Thu, 27 Sep 2018 16:50:57 +0530
From:   Veerabhadrarao Badiganti <vbadigan@...eaurora.org>
To:     Evan Green <evgreen@...omium.org>
Cc:     adrian.hunter@...el.com, Ulf Hansson <ulf.hansson@...aro.org>,
        robh+dt@...nel.org, asutoshd@...eaurora.org,
        riteshh@...eaurora.org, stummala@...eaurora.org,
        sayali <sayalil@...eaurora.org>,
        Doug Anderson <dianders@...gle.com>, mark.rutland@....com,
        linux-mmc@...r.kernel.org, devicetree@...r.kernel.org,
        linux-kernel@...r.kernel.org
Subject: Re: [PATCH 1/2] dt-bindings: mmc: sdhci-msm: Add flag for restoring
 dll



On 9/25/2018 11:08 PM, Evan Green wrote:
> On Tue, Sep 25, 2018 at 8:05 AM Veerabhadrarao Badiganti
> <vbadigan@...eaurora.org> wrote:
>> The dll settings of SDHC controller needs to be restored whenever
>> controller clocks are gated. This restoration is needed only on
>> few SDHCI-MSM controllers. This dt flag indicates whether dll
>> restoration is needed or not.
>>
>> 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..207ce36 100644
>> --- a/Documentation/devicetree/bindings/mmc/sdhci-msm.txt
>> +++ b/Documentation/devicetree/bindings/mmc/sdhci-msm.txt
>> @@ -31,6 +31,8 @@ Optional properties:
>>                                          BUS_OFF states in power irq. Should be specified in
>>                                          pairs (lpm, hpm), for BUS_OFF and BUS_ON respectively.
>>                                          Units uA.
>> +- qcom,restore-dll-config - Flag indicates that restoration of dll config after clock gating
>> +                           is needed on given platform. This wouldn't be needed for every MSM.
>>   Example:
>>
>>          sdhc_1: sdhci@...24900 {
>> @@ -49,6 +51,8 @@ Example:
>>
>>                  clocks = <&gcc GCC_SDCC1_APPS_CLK>, <&gcc GCC_SDCC1_AHB_CLK>;
>>                  clock-names = "core", "iface";
>> +
>> +               qcom,restore-dll-config;
> Hi Veera,
> I'm not sure this is the best approach. It might be better to key this
> behavior off of the compatible string. Actually I'm noticing now that
> the binding for this device doesn't include an SoC-specific compatible
> string, which I think is now the preferred way (eg
> "qcom,sdm845-sdhci", "qcom,sdhci-msm-v5"). I think we should add that
> to sdhci-msm.txt, then use the compatible string to enable this
> behavior you're adding now.

Thanks Evan. I will update this one.

> -Evan

Thanks,
Veera