Date:   Tue, 21 Mar 2023 05:33:50 +0000
From:   Nancy Lin (林欣螢) <Nancy.Lin@...iatek.com>
To:     "p.zabel@...gutronix.de" <p.zabel@...gutronix.de>,
        "matthias.bgg@...il.com" <matthias.bgg@...il.com>,
        "krzysztof.kozlowski@...aro.org" <krzysztof.kozlowski@...aro.org>,
        "angelogioacchino.delregno@...labora.com" 
        <angelogioacchino.delregno@...labora.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>,
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        Project_Global_Chrome_Upstream_Group 
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Subject: Re: [PATCH v29 1/7] dt-bindings: mediatek: add ethdr definition for
 mt8195

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.

Regards,
Nancy


> > Regards,
> > Nancy
> > 
> > 
> > > > Best regards,
> > > > Krzysztof
> > > > 
> 
> 
> 
> 
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