linux-kernel - Re: [PATCH v29 1/7] dt-bindings: mediatek: add ethdr definition for mt8195

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Message-ID: <b04eb48e-c9aa-0404-33ec-bef623b8282f@linaro.org>
Date:   Thu, 16 Mar 2023 07:31:11 +0100
From:   Krzysztof Kozlowski <krzysztof.kozlowski@...aro.org>
To:     Nancy Lin (林欣螢) <Nancy.Lin@...iatek.com>,
        "p.zabel@...gutronix.de" <p.zabel@...gutronix.de>,
        "matthias.bgg@...il.com" <matthias.bgg@...il.com>,
        "chunkuang.hu@...nel.org" <chunkuang.hu@...nel.org>,
        "robh+dt@...nel.org" <robh+dt@...nel.org>,
        "krzysztof.kozlowski+dt@...aro.org" 
        <krzysztof.kozlowski+dt@...aro.org>
Cc:     "linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
        "linux-mediatek@...ts.infradead.org" 
        <linux-mediatek@...ts.infradead.org>,
        Singo Chang (張興國) 
        <Singo.Chang@...iatek.com>,
        "nathan@...nel.org" <nathan@...nel.org>,
        "devicetree@...r.kernel.org" <devicetree@...r.kernel.org>,
        "daniel@...ll.ch" <daniel@...ll.ch>,
        CK Hu (胡俊光) <ck.hu@...iatek.com>,
        "dri-devel@...ts.freedesktop.org" <dri-devel@...ts.freedesktop.org>,
        Project_Global_Chrome_Upstream_Group 
        <Project_Global_Chrome_Upstream_Group@...iatek.com>,
        "linux-arm-kernel@...ts.infradead.org" 
        <linux-arm-kernel@...ts.infradead.org>,
        "clang-built-linux@...glegroups.com" 
        <clang-built-linux@...glegroups.com>,
        "ndesaulniers@...gle.com" <ndesaulniers@...gle.com>
Subject: Re: [PATCH v29 1/7] dt-bindings: mediatek: add ethdr definition for
 mt8195

On 16/03/2023 07:19, Nancy Lin (林欣螢) wrote:
> On Wed, 2023-03-15 at 08:16 +0100, Krzysztof Kozlowski wrote:
>> On 15/03/2023 04:45, Nancy Lin (林欣螢) wrote:
>>
>> Trim the replies and remove unneeded context. You want to get the
>> attention of other people, not force them to read entire email.
>>
>>>> +  mediatek,gce-client-reg:>> +    $ref:
>>>> /schemas/types.yaml#/definitions/phandle-array
>>>> +    description: The register of display function block to be
>>>> set by
>>>> gce.
>>>> +      There are 4 arguments in this property, gce node, subsys
>>>> id,
>>>> offset and
>>>> +      register size. The subsys id is defined in the gce header
>>>> of
>>>> each chips
>>>> +      include/dt-bindings/gce/<chip>-gce.h, mapping to the
>>>> register
>>>> of display
>>>> +      function block.
>>>> +    items:
>>>> +      items:
>>>> +        - description: phandle of GCE
>>>> +        - description: GCE subsys id
>>>> +        - description: register offset
>>>> +        - description: register size
>>>> +    minItems: 7
>>>> +    maxItems: 7
>>>> +
>>>
>>> Hi Rob and krzysztof,
>>>
>>> I got the two messages when running dt_binding_check [1]. This
>>> binding
>>> patch was sent previously in [2]. 
>>>
>>> If I remove the following items/minItems/maxItems in the
>>> mediatek,gce-
>>> client property, the two message disappear. I don't know what's
>>> wrong
>>> with the original syntax. Do you have any suggestions for this?
>>>
>>> -    items:
>>> -      items:
>>> -        - description: phandle of GCE
>>> -        - description: GCE subsys id
>>> -        - description: register offset
>>> -        - description: register size
>>> -    minItems: 7
>>> -    maxItems: 7
>>>
>>>
>>> [1].
>>> Documentation/devicetree/bindings/display/mediatek/mediatek,ethdr.e
>>> xamp
>>> le.dtb
>>> /proj/mtk19347/cros/src/third_party/kernel/v5.10/Documentation/devi
>>> cetr
>>> ee/bindings/display/mediatek/mediatek,ethdr.example.dtb: 
>>> hdr-engine@...14000: mediatek,gce-client-reg:0: [4294967295, 7,
>>> 16384,
>>> 4096, 4294967295, 7, 20480, 4096, 4294967295, 7, 28672, 4096,
>>> 4294967295, 7, 36864, 4096, 4294967295, 7, 40960, 4096, 4294967295,
>>> 7,
>>> 45056, 4096, 4294967295, 7, 49152, 4096] is too long
>>>         From schema:
>>
>> This looks like known issue with phandles with variable number of
>> arguments. Either we add it to the exceptions or just define it in
>> reduced way like in other cases - only maxItems: 1 without describing
>> items.
>>
>>
>> Best regards,
>> Krzysztof
> 
> 
> Hi Krzysztof,
> 
> Thanks for the comment.
> 
> But I have several items for this vendor property in the binding
> example.

Do you? I thought you have one phandle?

> Can I remove maxItems? Change the mediatek,gce-client-reg as [1].
> 
> [1]
>   mediatek,gce-client-reg:
>     $ref: /schemas/types.yaml#/definitions/phandle-array
>     description: The register of display function block to be set by
> gce.
>       There are 4 arguments in this property, gce node, subsys id,
> offset and
>       register size. The subsys id is defined in the gce header of each
> chips
>       include/dt-bindings/gce/<chip>-gce.h, mapping to the register of
> display
>       function block.

No, this needs some constraints.

Best regards,
Krzysztof