linux-kernel - Re: [PATCH v5 14/20] dt-bindings: PCI: dwc: Add Baikal-T1 PCIe Root Port bindings

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Date:   Wed, 31 Aug 2022 16:28:10 -0500
From:   Rob Herring <robh@...nel.org>
To:     Serge Semin <Sergey.Semin@...kalelectronics.ru>
Cc:     Krzysztof Kozlowski <krzysztof.kozlowski+dt@...aro.org>,
        Alexey Malahov <Alexey.Malahov@...kalelectronics.ru>,
        Lorenzo Pieralisi <lorenzo.pieralisi@....com>,
        Jingoo Han <jingoohan1@...il.com>,
        Manivannan Sadhasivam <manivannan.sadhasivam@...aro.org>,
        Rob Herring <robh+dt@...nel.org>,
        Krzysztof Wilczyński <kw@...ux.com>,
        Frank Li <Frank.Li@....com>, devicetree@...r.kernel.org,
        linux-kernel@...r.kernel.org,
        Serge Semin <fancer.lancer@...il.com>,
        Gustavo Pimentel <gustavo.pimentel@...opsys.com>,
        linux-pci@...r.kernel.org,
        Pavel Parkhomenko <Pavel.Parkhomenko@...kalelectronics.ru>,
        Bjorn Helgaas <bhelgaas@...gle.com>
Subject: Re: [PATCH v5 14/20] dt-bindings: PCI: dwc: Add Baikal-T1 PCIe Root
 Port bindings

On Mon, 22 Aug 2022 21:46:55 +0300, Serge Semin wrote:
> Baikal-T1 SoC is equipped with DWC PCIe v4.60a Root Port controller, which
> link can be trained to work on up to Gen.3 speed over up to x4 lanes. The
> controller is supposed to be fed up with four clock sources: DBI
> peripheral clock, AXI application Tx/Rx clocks and external PHY/core
> reference clock generating the 100MHz signal. In addition to that the
> platform provide a way to reset each part of the controller:
> sticky/non-sticky bits, host controller core, PIPE interface, PCS/PHY and
> Hot/Power reset signal. The Root Port controller is equipped with multiple
> IRQ lines like MSI, system AER, PME, HP, Bandwidth change, Link
> equalization request and eDMA ones. The registers space is accessed over
> the DBI interface. There can be no more than four inbound or outbound iATU
> windows configured.
> 
> Signed-off-by: Serge Semin <Sergey.Semin@...kalelectronics.ru>
> 
> ---
> 
> Changelog v2:
> - Rename 'syscon' property to 'baikal,bt1-syscon'.
> - Fix the 'compatible' property definition to being more specific about
>   what strings are supposed to be used. Due to that we had to add the
>   select property to evaluate the schema against the Baikal-T1 PCIe DT
>   nodes only.
> 
> Changelog v5:
> - Drop generic fallback names from the compatible property constraints.
>   (@Rob)
> - Define ordered {reg,interrupt,clock,reset}-names properties. (@Rob)
> - Drop minItems from the clocks and reset properties, since it equals
>   to the maxItems for them.
> - Drop num-ob-windows and num-ib-windows properties constraint. (@Rob)
> ---
>  .../bindings/pci/baikal,bt1-pcie.yaml         | 153 ++++++++++++++++++
>  1 file changed, 153 insertions(+)
>  create mode 100644 Documentation/devicetree/bindings/pci/baikal,bt1-pcie.yaml
> 

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