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

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Message-ID: <cac08caf-a5ef-08d7-ac90-cd852cd63e3c@collabora.com>
Date:   Tue, 21 Mar 2023 10:54:51 +0100
From:   AngeloGioacchino Del Regno 
        <angelogioacchino.delregno@...labora.com>
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>,
        "krzysztof.kozlowski@...aro.org" <krzysztof.kozlowski@...aro.org>,
        "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

Il 21/03/23 06:33, Nancy Lin (林欣螢) ha scritto:
> Dear Angelo,
> 
> Sorry for late reply.
> 
> On Fri, 2023-03-17 at 10:58 +0100, AngeloGioacchino Del Regno wrote:
>> Il 17/03/23 10:52, Nancy Lin (林欣螢) ha scritto:
>>> On Fri, 2023-03-17 at 10:37 +0100, AngeloGioacchino Del Regno
>>> wrote:
>>>> Il 17/03/23 10:03, Krzysztof Kozlowski ha scritto:
>>>>> On 17/03/2023 08:55, Nancy Lin (林欣螢) wrote:
>>>>>> On Thu, 2023-03-16 at 12:36 +0100, Krzysztof Kozlowski wrote:
>>>>>>> On 16/03/2023 10:53, AngeloGioacchino Del Regno wrote:
>>>>>>>
>>>>>>>> Hello Krzysztof, Nancy,
>>>>>>>>
>>>>>>>> Since this series has reached v29, can we please reach an
>>>>>>>> agreement
>>>>>>>> on the bindings
>>>>>>>> to use here, so that we can get this finally upstreamed?
>>>>>>>>
>>>>>>>> I will put some examples to try to get this issue
>>>>>>>> resolved.
>>>>>>>>
>>>>>>>> ### Example 1: Constrain the number of GCE entries to
>>>>>>>> *seven*
>>>>>>>> array
>>>>>>>> elements (7x4!)
>>>>>>>>
>>>>>>>>       mediatek,gce-client-reg:
>>>>>>>>         $ref: /schemas/types.yaml#/definitions/phandle-
>>>>>>>> array
>>>>>>>>         maxItems: 1
>>>>>>>>         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:
>>>>>>>>           minItems: 28
>>>>>>>>           maxItems: 28
>>>>>>>>           items:                     <----- this block
>>>>>>>> doesn't
>>>>>>>> seem to
>>>>>>>> get checked :\
>>>>>>>>             - description: phandle of GCE
>>>>>>>>             - description: GCE subsys id
>>>>>>>>             - description: register offset
>>>>>>>>             - description: register size
>>>>>>>
>>>>>>> This is what we would like to have but it requires
>>>>>>> exception in
>>>>>>> dtschema. Thus:
>>>>>>>
>>>>>>>>
>>>>>>>>
>>>>>>>> ### Example 2: Don't care about constraining the number
>>>>>>>> of
>>>>>>>> arguments
>>>>>>>>
>>>>>>>>       mediatek,gce-client-reg:
>>>>>>>>         $ref: /schemas/types.yaml#/definitions/phandle-
>>>>>>>> array
>>>>>>>>         maxItems: 1
>>>>>>>>         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.
>>>>>>>
>>>>>>> use this.
>>>>>>>
>>>>>>> Best regards,
>>>>>>> Krzysztof
>>>>>>
>>>>>>
>>>>>> Hi Krzysztof, Angelo,
>>>>>>
>>>>>> Thanks for the comment.
>>>>>> The Example 2 can pass dt_binding_check.
>>>>>>
>>>>>> But the example in the binding has 7 items [1] and dts [2].
>>>>>> Does
>>>>>> the
>>>>>> "maxItems: 1" affect any other schema or dts check?
>>>>>
>>>>> Ah, then it should be maxItems: 7, not 1.
>>>>>
>>>>
>>>> Keep in mind for your v30:
>>>>
>>>> maxItems: 7 will pass - but only if minItems is *not* 7 :-)
>>>>
>>>> -> (so, do not declare minItems, as default is 1) <-
>>>>
>>>> Regards,
>>>> Angelo
>>>>
>>>
>>> Hi Angelo,
>>>
>>> I still have one message [1] when runing dt_binding_check for
>>> "example
>>> 2 + maxItems: 7" [2].
>>>
>>> [1]
>>> /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: [[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 short
>>>
>>>
>>> [2]
>>>      mediatek,gce-client-reg:
>>>        $ref: /schemas/types.yaml#/definitions/phandle-array
>>>        maxItems: 7
>>>        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.
>>>
>>
>> Maybe I'm wrong about the "do not declare minItems"... try with
>>
>> minItems: 1
>> maxItems: 7
>>
>>
>> ...does it work now?
>>
> 
> Yes, It works well with "example2 + minItems:1 + maxItems: 7" [1]
> 
> [1]
>    mediatek,gce-client-reg:
>      $ref: /schemas/types.yaml#/definitions/phandle-array
>      minItems: 1
>      maxItems: 7
>      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.
> 

Please send a v30 with that solution ASAP then, so that we may perhaps *finally*
get it in for v6.4.

Regards,
Angelo