linux-kernel - Re: [PATCH v6 10/20] dt-bindings: PCI: dwc: Add reg/reg-names common properties

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Date:   Thu, 10 Nov 2022 15:22:18 -0600
From:   Rob Herring <robh@...nel.org>
To:     Serge Semin <Sergey.Semin@...kalelectronics.ru>
Cc:     Alexey Malahov <Alexey.Malahov@...kalelectronics.ru>,
        Lorenzo Pieralisi <lorenzo.pieralisi@....com>,
        Serge Semin <fancer.lancer@...il.com>,
        Krzysztof Wilczyński <kw@...ux.com>,
        Jingoo Han <jingoohan1@...il.com>, linux-pci@...r.kernel.org,
        Robin Murphy <robin.murphy@....com>,
        Krzysztof Kozlowski <krzysztof.kozlowski+dt@...aro.org>,
        Pavel Parkhomenko <Pavel.Parkhomenko@...kalelectronics.ru>,
        Gustavo Pimentel <gustavo.pimentel@...opsys.com>,
        Rob Herring <robh+dt@...nel.org>,
        Cai Huoqing <cai.huoqing@...ux.dev>,
        linux-kernel@...r.kernel.org, Vinod Koul <vkoul@...nel.org>,
        caihuoqing <caihuoqing@...du.com>,
        Bjorn Helgaas <bhelgaas@...gle.com>,
        devicetree@...r.kernel.org, Frank Li <Frank.Li@....com>,
        Manivannan Sadhasivam <manivannan.sadhasivam@...aro.org>
Subject: Re: [PATCH v6 10/20] dt-bindings: PCI: dwc: Add reg/reg-names common
 properties


On Mon, 07 Nov 2022 23:49:24 +0300, Serge Semin wrote:
> Even though there is a more-or-less limited set of the CSR spaces can be
> defined for each DW PCIe controller the generic DT-schema currently
> doesn't specify much limitations on the reg-space names used for one or
> another range. In order to prevent the vendor-specific controller schemas
> further deviation from the generic interface let's fix that by introducing
> the reg-names definition in the common DW PCIe DT-schemas and preserving
> the generic "reg" and "reg-names" properties in there. New DW PCIe device
> DT-bindings are encouraged to use the generic set of the CSR spaces
> defined in the generic DW PCIe RP/EP DT-bindings, while the already
> available vendor-specific DT-bindings can still apple the common
> DT-schemas.
> 
> Note the number of reg/reg-names items need to be changed in the DW PCIe
> EP DT-schema since aside with the "dbi" CSRs space these arrays can have
> "dbi2", "addr_space", "atu", etc ranges.
> 
> Also note since there are DW PCIe-based vendor-specific DT-bindings with
> the custom names assigned to the same CSR resources we have no much choice
> but to add them to the generic DT-schemas in order to have the schemas
> being applicable for such devices. These names are marked as
> vendor-specific and should be avoided being used in new bindings in favor
> of the generic names.
> 
> 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)
> - Split up reg-names in the same way as the interrupt-names: common,
>   Root Port and Endpoint specific names. (@Rob)
> - Drop synonymous from the names list since the device schemas create
>   their own enumerations anyway.
> 
> Changelog v5:
> - Add platform-specific reg names, but mark them as deprecated.
> 
> Changelog v6:
> - Move the common reg-names definitions to the RP/EP schemas. Thus drop
>   the 'definitions' property. (@Rob)
> - Drop the 'deprecated' keywords from the vendor-specific names. (@Rob)
> ---
>  .../bindings/pci/snps,dw-pcie-common.yaml     | 22 +++++
>  .../bindings/pci/snps,dw-pcie-ep.yaml         | 82 +++++++++++++++++--
>  .../devicetree/bindings/pci/snps,dw-pcie.yaml | 78 ++++++++++++++++--
>  3 files changed, 169 insertions(+), 13 deletions(-)
> 

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