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

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Date:   Fri, 17 Mar 2023 07:55:41 +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>,
        "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 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? 

[1]
+    mediatek,gce-client-reg = <&gce0 SUBSYS_1c11XXXX 0x4000 0x1000>,
+                              <&gce0 SUBSYS_1c11XXXX 0x5000 0x1000>,
+                              <&gce0 SUBSYS_1c11XXXX 0x7000 0x1000>,
+                              <&gce0 SUBSYS_1c11XXXX 0x9000 0x1000>,
+                              <&gce0 SUBSYS_1c11XXXX 0xa000 0x1000>,
+                              <&gce0 SUBSYS_1c11XXXX 0xb000 0x1000>,
+                              <&gce0 SUBSYS_1c11XXXX 0xc000 0x1000>;
> 

[2] [v21,25/25] arm64: dts: mt8195: add display node for vdosys1

https://patchwork.kernel.org/project/linux-mediatek/patch/20220504091440.2052-26-nancy.lin@mediatek.com/

Regards,
Nancy