linux-kernel - Re: [PATCH v1 5/6] dt-bindings: memory: tegra20: emc: Convert to schema

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Date:   Tue, 30 Mar 2021 17:33:58 -0500
From:   Rob Herring <robh@...nel.org>
To:     Dmitry Osipenko <digetx@...il.com>
Cc:     Krzysztof Kozlowski <krzysztof.kozlowski@...onical.com>,
        Thierry Reding <thierry.reding@...il.com>,
        Jonathan Hunter <jonathanh@...dia.com>,
        devicetree@...r.kernel.org, linux-kernel@...r.kernel.org,
        linux-tegra@...r.kernel.org
Subject: Re: [PATCH v1 5/6] dt-bindings: memory: tegra20: emc: Convert to
 schema

On Tue, Mar 30, 2021 at 06:56:44PM +0300, Dmitry Osipenko wrote:
> 30.03.2021 18:29, Dmitry Osipenko пишет:
> > 30.03.2021 11:48, Krzysztof Kozlowski пишет:
> >>> +  power-domains:
> >>> +    $ref: /schemas/types.yaml#/definitions/phandle
> >>> +    description:
> >>> +      Phandle of the SoC "core" power domain.
> >> I think the core checks the type, so you only need to limit max items.
> >>
> > 
> > It's a bit confusing that both variants work and it's not apparent what
> > variant is better.

Soon '$ref' won't work. I have a pending meta-schema change to catch 
this. It takes some time because I have to fix all the existing cases in 
tree and wait a cycle so I'm not breaking everyone. 

> > 
> > I actually used the max items limit initially and then changed it to
> > $ref phandle because it appeared to me that it's a better choice. I'll
> > switch back to the limit in v2, thanks.
> > 
> 
> Although, I'm still not sure what is the best variant. Could you please
> clarify why maxItems is better?
> 
> Seems the $ref phandle already limits domain items to 1. So I don't
> understand what's the difference.

It would not work with '<&domain 1>' as 'phandle' doesn't accept any 
arg cells. While you may know you don't have any cells, technically 
that's provider dependent and outside the scope of this binding.

Rob