linux-kernel - Re: [PATCH v1 1/2] scsi: dt-bindings: ufs: Add vcc-voltage-level for UFS

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Message-ID: <aaed1cfb1cdee8cd6e45191814af5763@codeaurora.org>
Date:   Mon, 14 Sep 2020 09:19:09 -0700
From:   nguyenb@...eaurora.org
To:     Avri Altman <Avri.Altman@....com>
Cc:     cang@...eaurora.org, asutoshd@...eaurora.org,
        martin.petersen@...cle.com, linux-scsi@...r.kernel.org,
        linux-arm-msm@...r.kernel.org, Rob Herring <robh+dt@...nel.org>,
        Bjorn Andersson <bjorn.andersson@...aro.org>,
        Vinod Koul <vkoul@...nel.org>,
        "open list:OPEN FIRMWARE AND FLATTENED DEVICE TREE BINDINGS" 
        <devicetree@...r.kernel.org>,
        open list <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH v1 1/2] scsi: dt-bindings: ufs: Add vcc-voltage-level for
 UFS

On 2020-09-13 02:35, Avri Altman wrote:
>> 
>> 
>> UFS's specifications supports a range of Vcc operating
>> voltage levels. Add documentation for the UFS's Vcc voltage
>> levels setting.
>> 
>> Signed-off-by: Can Guo <cang@...eaurora.org>
>> Signed-off-by: Asutosh Das <asutoshd@...eaurora.org>
>> Signed-off-by: Bao D. Nguyen <nguyenb@...eaurora.org>
>> ---
>>  Documentation/devicetree/bindings/ufs/ufshcd-pltfrm.txt | 2 ++
>>  1 file changed, 2 insertions(+)
>> 
>> diff --git a/Documentation/devicetree/bindings/ufs/ufshcd-pltfrm.txt
>> b/Documentation/devicetree/bindings/ufs/ufshcd-pltfrm.txt
>> index 415ccdd..7257b32 100644
>> --- a/Documentation/devicetree/bindings/ufs/ufshcd-pltfrm.txt
>> +++ b/Documentation/devicetree/bindings/ufs/ufshcd-pltfrm.txt
>> @@ -23,6 +23,8 @@ Optional properties:
>>                            with "phys" attribute, provides phandle to 
>> UFS PHY node
>>  - vdd-hba-supply        : phandle to UFS host controller supply 
>> regulator node
>>  - vcc-supply            : phandle to VCC supply regulator node
>> +- vcc-voltage-level     : specifies voltage levels for VCC supply.
> For ufs3.1+ devices
Thanks for the comments, Avri.
I am not clear what this comment means. Could you please clarify?
> 
>> +                          Should be specified in pairs (min, max), 
>> units uV.
>>  - vccq-supply           : phandle to VCCQ supply regulator node
>>  - vccq2-supply          : phandle to VCCQ2 supply regulator node
>>  - vcc-supply-1p8        : For embedded UFS devices, valid VCC range 
>> is 1.7-1.95V
>> --
> Why are you removing all other docs?
> They are still relevant for non ufs3.1 devices.
I did not remove anything. You may be confused by the "-" used as 
listing in the original document.