linux-kernel - Re: [PATCH v2 2/4] dt-bindings: pci: ti,j721e: Add host mode dt-bindings for TI's AM64 SoC

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Date:   Mon, 11 Jan 2021 16:37:50 -0600
From:   Rob Herring <robh@...nel.org>
To:     Kishon Vijay Abraham I <kishon@...com>
Cc:     Bjorn Helgaas <bhelgaas@...gle.com>,
        Tom Joseph <tjoseph@...ence.com>,
        Lorenzo Pieralisi <lorenzo.pieralisi@....com>,
        Nadeem Athani <nadeem@...ence.com>, linux-pci@...r.kernel.org,
        devicetree@...r.kernel.org, linux-kernel@...r.kernel.org,
        linux-omap@...r.kernel.org, linux-arm-kernel@...ts.infradead.org
Subject: Re: [PATCH v2 2/4] dt-bindings: pci: ti,j721e: Add host mode
 dt-bindings for TI's AM64 SoC

On Mon, Jan 04, 2021 at 06:11:01PM +0530, Kishon Vijay Abraham I wrote:
> Add host mode dt-bindings for TI's AM64 SoC. This is the same IP used in
> J7200, however AM64 is a non-coherent architecture.
> 
> Signed-off-by: Kishon Vijay Abraham I <kishon@...com>
> ---
>  .../devicetree/bindings/pci/ti,j721e-pci-host.yaml     | 10 +++++++---
>  1 file changed, 7 insertions(+), 3 deletions(-)
> 
> diff --git a/Documentation/devicetree/bindings/pci/ti,j721e-pci-host.yaml b/Documentation/devicetree/bindings/pci/ti,j721e-pci-host.yaml
> index 7607018a115b..77118dba415e 100644
> --- a/Documentation/devicetree/bindings/pci/ti,j721e-pci-host.yaml
> +++ b/Documentation/devicetree/bindings/pci/ti,j721e-pci-host.yaml
> @@ -16,12 +16,17 @@ allOf:
>  properties:
>    compatible:
>      oneOf:
> -      - description: PCIe controller in J7200
> +      - const: ti,am64-pcie-host

No, either you have fallback or you don't. 

> +      - const: ti,j7200-pcie-host
> +      - const: ti,j721e-pcie-host
> +      - description: PCIe controller in AM64
>          items:
> +          - const: ti,am64-pcie-host
>            - const: ti,j7200-pcie-host
>            - const: ti,j721e-pcie-host

2 fallbacks is probably not too useful. Do those really enable 
anything?

> -      - description: PCIe controller in J721E
> +      - description: PCIe controller in J7200
>          items:
> +          - const: ti,j7200-pcie-host
>            - const: ti,j721e-pcie-host
>  
>    reg:
> @@ -87,7 +92,6 @@ required:
>    - vendor-id
>    - device-id
>    - msi-map
> -  - dma-coherent
>    - dma-ranges
>    - ranges
>    - reset-gpios
> -- 
> 2.17.1
>