linux-kernel - Re: [PATCH v5 07/20] dt-bindings: PCI: dwc: Apply generic schema for generic device only

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Message-ID: <20220831211837.GA267498-robh@kernel.org>
Date:   Wed, 31 Aug 2022 16:18:37 -0500
From:   Rob Herring <robh@...nel.org>
To:     Serge Semin <Sergey.Semin@...kalelectronics.ru>
Cc:     Jingoo Han <jingoohan1@...il.com>,
        Krzysztof Kozlowski <krzysztof.kozlowski+dt@...aro.org>,
        Krzysztof Wilczyński <kw@...ux.com>,
        linux-kernel@...r.kernel.org, Frank Li <Frank.Li@....com>,
        Bjorn Helgaas <bhelgaas@...gle.com>,
        Manivannan Sadhasivam <manivannan.sadhasivam@...aro.org>,
        devicetree@...r.kernel.org,
        Lorenzo Pieralisi <lorenzo.pieralisi@....com>,
        linux-pci@...r.kernel.org,
        Gustavo Pimentel <gustavo.pimentel@...opsys.com>,
        Pavel Parkhomenko <Pavel.Parkhomenko@...kalelectronics.ru>,
        Rob Herring <robh+dt@...nel.org>,
        Serge Semin <fancer.lancer@...il.com>,
        Alexey Malahov <Alexey.Malahov@...kalelectronics.ru>
Subject: Re: [PATCH v5 07/20] dt-bindings: PCI: dwc: Apply generic schema for
 generic device only

On Mon, 22 Aug 2022 21:46:48 +0300, Serge Semin wrote:
> Having the generic compatible strings constraints with the 'any'+'generic
> string' semantic implicitly encourages either to add new DW PCIe-based
> DT-bindings with the generic compatible string attached or just forget
> about adding new DT-bindings since the corresponding DT-node will be
> evaluated anyway. Moreover having that semantic implemented in the
> generic DT-schema causes the DT-validation tool to apply the schema twice:
> first by implicit compatible-string-based selection and second by means of
> the 'allOf: [ $ref ]' statement. Let's fix all of that by dropping the
> compatible property constraints and selecting the generic DT-schema only
> for the purely generic DW PCIe DT-nodes. The later is required since there
> is a driver for such devices. (Though there are no such DT-nodes currently
> defined in the kernel DT sources.)
> 
> Signed-off-by: Serge Semin <Sergey.Semin@...kalelectronics.ru>
> 
> ---
> 
> Changelog v3:
> - This is a new patch unpinned from the next one:
>   https://lore.kernel.org/linux-pci/20220503214638.1895-2-Sergey.Semin@baikalelectronics.ru/
>   by the Rob' request. (@Rob)
> - Fix compatible property schema so one would work as expected: string
>   must contain either generic DW PCIe IP-core name or both generic and
>   equipped with IP-core version names.
> 
> Changelog v5:
> - Switch the patch from not-selecting the generic schemas to applying
>   them to the generic DW PCIe device nodes only.
> - Drop the generic compatible string used as fallback. (@Rob)
> ---
>  .../devicetree/bindings/pci/snps,dw-pcie-ep.yaml | 16 ++++++++++------
>  .../devicetree/bindings/pci/snps,dw-pcie.yaml    | 16 ++++++++++------
>  2 files changed, 20 insertions(+), 12 deletions(-)
> 

Reviewed-by: Rob Herring <robh@...nel.org>