linux-kernel - Re: [PATCH 1/3] dt-bindings: usb: qcom,dwc3: Add multi-pd bindings for dwc3 qcom

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Date:   Mon, 6 Sep 2021 14:45:43 +0530
From:   Sandeep Maheswaram <sanm@...eaurora.org>
To:     Doug Anderson <dianders@...omium.org>
Cc:     Rob Herring <robh+dt@...nel.org>, Andy Gross <agross@...nel.org>,
        Bjorn Andersson <bjorn.andersson@...aro.org>,
        Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        Felipe Balbi <balbi@...nel.org>,
        Stephen Boyd <swboyd@...omium.org>,
        Matthias Kaehlcke <mka@...omium.org>,
        "open list:OPEN FIRMWARE AND FLATTENED DEVICE TREE BINDINGS" 
        <devicetree@...r.kernel.org>,
        linux-arm-msm <linux-arm-msm@...r.kernel.org>,
        Linux USB List <linux-usb@...r.kernel.org>,
        LKML <linux-kernel@...r.kernel.org>,
        Pratham Pratap <prathampratap@...eaurora.org>
Subject: Re: [PATCH 1/3] dt-bindings: usb: qcom,dwc3: Add multi-pd bindings
 for dwc3 qcom


On 8/31/2021 1:37 AM, Doug Anderson wrote:
> Hi,
>
> On Mon, Aug 30, 2021 at 10:55 AM Sandeep Maheswaram <sanm@...eaurora.org> wrote:
>> Add multi pd bindings to set performance state for cx domain
>> to maintain minimum corner voltage for USB clocks.
>>
>> Signed-off-by: Sandeep Maheswaram <sanm@...eaurora.org>
>> ---
>>   Documentation/devicetree/bindings/usb/qcom,dwc3.yaml | 13 ++++++++++++-
>>   1 file changed, 12 insertions(+), 1 deletion(-)
>>
>> diff --git a/Documentation/devicetree/bindings/usb/qcom,dwc3.yaml b/Documentation/devicetree/bindings/usb/qcom,dwc3.yaml
>> index e70afc4..838d9c4 100644
>> --- a/Documentation/devicetree/bindings/usb/qcom,dwc3.yaml
>> +++ b/Documentation/devicetree/bindings/usb/qcom,dwc3.yaml
>> @@ -41,7 +41,18 @@ properties:
>>
>>     power-domains:
>>       description: specifies a phandle to PM domain provider node
>> -    maxItems: 1
>> +    minItems: 1
>> +    items:
>> +      - description: optional,cx power domain
>> +      - description: USB gdsc power domain
> You need to re-order the above. The optional one needs to be second, not first.
>
I wanted to use required-opps for cx domain only. so I have put it first 
in order.
>> +  power-domain-names:
>> +     items:
>> +      - const: cx
>> +      - const: usb_gdsc
> Why do you need the names at all? The ordering of power-domains is
> well defined and there are no holes in it and there are no legacy
> reasons for having the names (like there are for clocks), so you
> should drop. This is much like reg-names and I always point people to
> this message from Rob Herring about reg-names:
>
> https://lore.kernel.org/r/CAL_Jsq+MMunmVWqeW9v2RyzsMKP+=kMzeTHNMG4JDHM7Fy0HBg@mail.gmail.com/
>
> You'll have to change your driver to use dev_pm_domain_attach_by_id()
> but that should be fine.
>
> -Doug

Ok..I will try using  dev_pm_domain_attach_by_id()