linux-kernel - Re: [PATCH v4 2/3] dt-bindings: usb: snps,dwc3: Add runtime-suspend-on-usb-suspend property

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Date:   Sat, 26 Aug 2023 10:39:07 +0200
From:   Krzysztof Kozlowski <krzysztof.kozlowski@...aro.org>
To:     Thinh Nguyen <Thinh.Nguyen@...opsys.com>,
        Roger Quadros <rogerq@...nel.org>,
        Elson Serrao <quic_eserrao@...cinc.com>
Cc:     "gregkh@...uxfoundation.org" <gregkh@...uxfoundation.org>,
        "robh+dt@...nel.org" <robh+dt@...nel.org>,
        "krzysztof.kozlowski+dt@...aro.org" 
        <krzysztof.kozlowski+dt@...aro.org>,
        "conor+dt@...nel.org" <conor+dt@...nel.org>,
        "devicetree@...r.kernel.org" <devicetree@...r.kernel.org>,
        "linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
        "linux-usb@...r.kernel.org" <linux-usb@...r.kernel.org>
Subject: Re: [PATCH v4 2/3] dt-bindings: usb: snps,dwc3: Add
 runtime-suspend-on-usb-suspend property

On 26/08/2023 03:53, Thinh Nguyen wrote:
>>>> For example on Qualcomm platforms there is a phy sideband signalling 
>>>> which detects the wakeup signal when resume is initiated by the host.
>>>
>>> So compatible-specific.
>>>
>>>> Thus qcom platforms can benefit from this feature by defining this dt 
>>>> property. (in a parallel discussion with Thinh N to come up with a 
>>>> better name for this dt entry).
>>>
>>> Thanks, with quite a long message you at the end admitted this is
>>> compatible-specific. Exactly what I wrote it one sentence previously.
>>>
> 
> Various dwc3 platforms often share a common capability that can be
> shared with a common dt property. If we dedicate a property such as in
> this case, it helps designers enable a certain feature without updating
> the driver every time a new platform is introduced. It also helps keep
> the driver a bit simpler on the compatible checks.

That's not the purpose of bindings. Sorry.

> 
> Regardless, what Krzysztof said is valid. Perhaps we can look into
> enhancing dwc3 to maintain shared behavior based on compatible instead?


Best regards,
Krzysztof