linux-kernel - Re: [RFC PATCH v2 2/3] dt-bindings: usb: generic-xhci: add Samsung Exynos compatible

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Date:   Mon, 2 Jan 2023 09:27:36 +0100
From:   Krzysztof Kozlowski <krzysztof.kozlowski@...aro.org>
To:     Jung Daehwan <dh10.jung@...sung.com>
Cc:     Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        Rob Herring <robh+dt@...nel.org>,
        Krzysztof Kozlowski <krzysztof.kozlowski+dt@...aro.org>,
        Thinh Nguyen <Thinh.Nguyen@...opsys.com>,
        Mathias Nyman <mathias.nyman@...el.com>,
        Felipe Balbi <balbi@...nel.org>,
        "open list:USB SUBSYSTEM" <linux-usb@...r.kernel.org>,
        "open list:OPEN FIRMWARE AND FLATTENED DEVICE TREE BINDINGS" 
        <devicetree@...r.kernel.org>,
        open list <linux-kernel@...r.kernel.org>, sc.suh@...sung.com,
        taehyun.cho@...sung.com, jh0801.jung@...sung.com,
        eomji.oh@...sung.com
Subject: Re: [RFC PATCH v2 2/3] dt-bindings: usb: generic-xhci: add Samsung
 Exynos compatible

On 02/01/2023 06:30, Jung Daehwan wrote:
> On Thu, Dec 29, 2022 at 11:19:09AM +0100, Krzysztof Kozlowski wrote:
>> On 29/12/2022 10:57, Daehwan Jung wrote:
>>> Add compatible for Samsung Exynos SOCs
>>
>> Missing full stop. Please explain here in details the hardware.
>> Otherwise it looks it is not for any hardware and patch should be dropped.
>>
> 
> I got it. This patch may be for new feature of generic xhci not for exynos.
> I will add hardware description on next submission.
> 
>> Also, missing DTS. I am going to keep NAK-ing this till you provide the
>> user.
>>
>> NAK.
>>
> 
> I've added a example and checked bindings following below guides.
> 
> https://docs.kernel.org/devicetree/bindings/submitting-patches.html
> https://docs.kernel.org/devicetree/bindings/writing-schema.html
> 
> I have no idea that I have to also submit DTS.
> I will submit it on next submission.

I have doubts that this accurate description of hardware, therefore I
want the DTS user of these bindings which will show entire picture.

> 
>>>
>>> Signed-off-by: Daehwan Jung <dh10.jung@...sung.com>
>>> ---
>>>  Documentation/devicetree/bindings/usb/generic-xhci.yaml | 2 ++
>>>  1 file changed, 2 insertions(+)
>>>
>>> diff --git a/Documentation/devicetree/bindings/usb/generic-xhci.yaml b/Documentation/devicetree/bindings/usb/generic-xhci.yaml
>>> index db841589fc33..f54aff477637 100644
>>> --- a/Documentation/devicetree/bindings/usb/generic-xhci.yaml
>>> +++ b/Documentation/devicetree/bindings/usb/generic-xhci.yaml
>>> @@ -29,6 +29,8 @@ properties:
>>>          enum:
>>>            - brcm,xhci-brcm-v2
>>>            - brcm,bcm7445-xhci
>>> +      - description: Samsung Exynos SoCs with xHCI
>>> +        const: samsung,exynos-xhci
>>
>> Missing fallback.
> 
> Modifying it like below is OK?
> 
> decription: Samsung Exynos SoCs with xHCI
>         items:
>             - const: samsung,exynos-xhci
>             - const: generic-xhci

To this comment yes, but in general this does not solve my concerns that
it does not look like real hardware at all.


Best regards,
Krzysztof