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Date:   Thu, 18 Aug 2022 09:06:44 -0600
From:   Rob Herring <robh@kernel.org>
To:     Conor Dooley <mail@conchuod.ie>
Cc:     Daire McNamara <daire.mcnamara@microchip.com>,
        Bjorn Helgaas <bhelgaas@google.com>,
        Krzysztof Kozlowski <krzysztof.kozlowski+dt@linaro.org>,
        Paul Walmsley <paul.walmsley@sifive.com>,
        Greentime Hu <greentime.hu@sifive.com>,
        Palmer Dabbelt <palmer@dabbelt.com>,
        Albert Ou <aou@eecs.berkeley.edu>,
        Lorenzo Pieralisi <lpieralisi@kernel.org>,
        Conor Dooley <conor.dooley@microchip.com>,
        linux-pci@vger.kernel.org, devicetree@vger.kernel.org,
        linux-kernel@vger.kernel.org, linux-riscv@lists.infradead.org
Subject: Re: [PATCH v2 2/6] dt-bindings: PCI: microchip,pcie-host: fix
 missing clocks properties
Message-ID: <20220818150644.GJ1829017-robh@kernel.org>
References: <20220816182547.3454843-1-mail@conchuod.ie>
 <20220816182547.3454843-3-mail@conchuod.ie>
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On Tue, Aug 16, 2022 at 07:25:44PM +0100, Conor Dooley wrote:
> From: Conor Dooley <conor.dooley@microchip.com>
> 
> Recent versions of dt-schema warn about unevaluatedProperties:
> arch/riscv/boot/dts/microchip/mpfs-icicle-kit.dtb: pcie@2000000000: Unevaluated properties are not allowed ('clock-names', 'clocks', 'legacy-interrupt-controller', 'microchip,axi-m-atr0' were unexpected)
>         From schema: Documentation/devicetree/bindings/pci/microchip,pcie-host.yaml
> 
> The clocks are required to enable interfaces between the FPGA fabric
> and the core complex, so add them to the binding.
> 
> Fixes: 6ee6c89aac35 ("dt-bindings: PCI: microchip: Add Microchip PolarFire host binding")
> Signed-off-by: Conor Dooley <conor.dooley@microchip.com>
> ---
> dt-schema v2022.08 is required to replicate
> ---
>  .../bindings/pci/microchip,pcie-host.yaml     | 25 +++++++++++++++++++
>  1 file changed, 25 insertions(+)
> 
> diff --git a/Documentation/devicetree/bindings/pci/microchip,pcie-host.yaml b/Documentation/devicetree/bindings/pci/microchip,pcie-host.yaml
> index edb4f81253c8..6bbde8693ef8 100644
> --- a/Documentation/devicetree/bindings/pci/microchip,pcie-host.yaml
> +++ b/Documentation/devicetree/bindings/pci/microchip,pcie-host.yaml
> @@ -25,6 +25,31 @@ properties:
>        - const: cfg
>        - const: apb
>  
> +  clocks:
> +    description:
> +      Fabric Interface Controllers, FICs, are the interface between the FPGA
> +      fabric and the core complex on PolarFire SoC. The FICs require two clocks,
> +      one from each side of the interface. The "FIC clocks" described by this
> +      property are on the core complex side & communication through a FIC is not
> +      possible unless it's corresponding clock is enabled. A clock must be
> +      enabled for each of the interfaces the root port is connected through.
> +      This could in theory be all 4 interfaces, one interface or any combination
> +      in between.
> +    minItems: 1
> +    items:
> +      - description: FIC0's clock
> +      - description: FIC1's clock
> +      - description: FIC2's clock
> +      - description: FIC3's clock
> +
> +  clock-names:
> +    description:
> +      As any FIC connection combination is possible, the names should match the
> +      order in the clocks property and take the form "ficN" where N is a number
> +      0-3
> +    minItems: 1
> +    maxItems: 4

items:
  pattern: '^fic[0-3]$'

> +
>    interrupts:
>      minItems: 1
>      items:
> -- 
> 2.37.1
> 
> 
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