linux-kernel - Re: [PATCH v2 2/2] dt-bindings: PCI: mediatek-gen3: add support for mt7986

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Date:   Tue, 25 Oct 2022 13:10:56 +0200
From:   AngeloGioacchino Del Regno 
        <angelogioacchino.delregno@...labora.com>
To:     Frank Wunderlich <linux@...web.de>,
        linux-mediatek@...ts.infradead.org,
        Krzysztof Kozlowski <krzysztof.kozlowski+dt@...aro.org>
Cc:     devicetree@...r.kernel.org, Ryder Lee <ryder.lee@...iatek.com>,
        linux-pci@...r.kernel.org, linux-kernel@...r.kernel.org,
        Jianjun Wang <jianjun.wang@...iatek.com>,
        Matthias Brugger <matthias.bgg@...il.com>,
        Rob Herring <robh+dt@...nel.org>,
        Bjorn Helgaas <bhelgaas@...gle.com>,
        linux-arm-kernel@...ts.infradead.org
Subject: Re: [PATCH v2 2/2] dt-bindings: PCI: mediatek-gen3: add support for
 mt7986

Il 25/10/22 09:28, Frank Wunderlich ha scritto:
> From: Frank Wunderlich <frank-w@...lic-files.de>
> 
> Add compatible string and clock-definition for mt7986. It needs 4 clocks
> for PCIe, define them in binding.
> 
> Signed-off-by: Frank Wunderlich <frank-w@...lic-files.de>
> ---
> v2:
> - squashed patch 2+3 (compatible and clock definition)
> ---
>   .../bindings/pci/mediatek-pcie-gen3.yaml        | 17 +++++++++++++++++
>   1 file changed, 17 insertions(+)
> 
> diff --git a/Documentation/devicetree/bindings/pci/mediatek-pcie-gen3.yaml b/Documentation/devicetree/bindings/pci/mediatek-pcie-gen3.yaml
> index 98d3f0f1cd76..57d0e84253e9 100644
> --- a/Documentation/devicetree/bindings/pci/mediatek-pcie-gen3.yaml
> +++ b/Documentation/devicetree/bindings/pci/mediatek-pcie-gen3.yaml
> @@ -48,6 +48,7 @@ properties:
>       oneOf:
>         - items:
>             - enum:
> +              - mediatek,mt7986-pcie
>                 - mediatek,mt8188-pcie
>                 - mediatek,mt8195-pcie
>             - const: mediatek,mt8192-pcie
> @@ -78,9 +79,11 @@ properties:
>         - const: mac
>   
>     clocks:
> +    minItems: 4
>       maxItems: 6

I'm not sure that this is really correct.
If you have a list of items (const or description, doesn't matter), you don't have
to specify maxItems, as it is implicitly equal to the number of items.
Also, specifying minItems means that you're "setting" one or more items as
optional.

It looks like you're specifying a specific and definite list of items for both
clocks and clock-names... and for all of the supported SoCs, so, I don't think
that having {min,max}Items globally specified on clocks, clock-names make any
kind of sense.

.....but I'd like for someone else to give an opinion on this as well.

Krzysztof, please?

Cheers,
Angelo

>   
>     clock-names:
> +    minItems: 4
>       maxItems: 6
>   
>     assigned-clocks:
> @@ -161,6 +164,20 @@ allOf:
>               - const: tl_32k
>               - const: peri_26m
>               - const: peri_mem
> +  - if:
> +      properties:
> +        compatible:
> +          contains:
> +            enum:
> +              - mediatek,mt7986-pcie
> +    then:
> +      properties:
> +        clock-names:
> +          items:
> +            - const: pl_250m
> +            - const: tl_26m
> +            - const: peri_26m
> +            - const: top_133m
>   
>   unevaluatedProperties: false
>   
>