linux-kernel - Re: [PATCH] dt-bindings: Improve phandle-array schemas

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Date:   Wed, 19 Jan 2022 12:35:42 +0200
From:   Vladimir Oltean <olteanv@...il.com>
To:     Rob Herring <robh@...nel.org>
Cc:     devicetree@...r.kernel.org, linux-kernel@...r.kernel.org,
        Damien Le Moal <damien.lemoal@...nsource.wdc.com>,
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Subject: Re: [PATCH] dt-bindings: Improve phandle-array schemas

On Tue, Jan 18, 2022 at 07:50:38PM -0600, Rob Herring wrote:
> The 'phandle-array' type is a bit ambiguous. It can be either just an
> array of phandles or an array of phandles plus args. Many schemas for
> phandle-array properties aren't clear in the schema which case applies
> though the description usually describes it.
> 
> The array of phandles case boils down to needing:
> 
> items:
>   maxItems: 1
> 
> The phandle plus args cases should typically take this form:
> 
> items:
>   - items:
>       - description: A phandle
>       - description: 1st arg cell
>       - description: 2nd arg cell
> 
> With this change, some examples need updating so that the bracketing of
> property values matches the schema.
> ---
(...)
> diff --git a/Documentation/devicetree/bindings/net/dsa/dsa-port.yaml b/Documentation/devicetree/bindings/net/dsa/dsa-port.yaml
> index 702df848a71d..c504feeec6db 100644
> --- a/Documentation/devicetree/bindings/net/dsa/dsa-port.yaml
> +++ b/Documentation/devicetree/bindings/net/dsa/dsa-port.yaml
> @@ -34,6 +34,8 @@ properties:
>        full routing information must be given, not just the one hop
>        routes to neighbouring switches
>      $ref: /schemas/types.yaml#/definitions/phandle-array
> +    items:
> +      maxItems: 1
>  
>    ethernet:
>      description:

For better or worse, the mainline cases of this property all take the
form of:

arch/arm64/boot/dts/marvell/armada-3720-turris-mox.dts
				link = <&switch1port9 &switch2port9>;
				link = <&switch1port10 &switch0port10>;
arch/arm/boot/dts/vf610-zii-dev-rev-b.dts
						link = <&switch1port6
							&switch2port9>;
						link = <&switch1port5
							&switch0port5>;
arch/arm/boot/dts/vf610-zii-scu4-aib.dts
						link = <&switch1port10
							&switch3port10
							&switch2port10>;
						link = <&switch3port10
							&switch2port10>;
						link = <&switch1port9
							&switch0port10>;

So not really an array of phandles.