linux-kernel - Re: [PATCH v2 14/15] spi: dt-bindings: snps,dw-ahb-ssi: Add generic dw-ahb-ssi version

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Date:   Tue, 13 Dec 2022 10:32:09 -0600
From:   Rob Herring <robh@...nel.org>
To:     Sudip Mukherjee <sudip.mukherjee@...ive.com>
Cc:     Serge Semin <fancer.lancer@...il.com>,
        Mark Brown <broonie@...nel.org>,
        Krzysztof Kozlowski <krzysztof.kozlowski+dt@...aro.org>,
        jude.onyenegecha@...ive.com, ben.dooks@...ive.com,
        jeegar.lakhani@...ive.com, linux-spi@...r.kernel.org,
        devicetree@...r.kernel.org, linux-kernel@...r.kernel.org
Subject: Re: [PATCH v2 14/15] spi: dt-bindings: snps,dw-ahb-ssi: Add generic
 dw-ahb-ssi version

On Mon, Dec 12, 2022 at 06:07:31PM +0000, Sudip Mukherjee wrote:
> Add new snps,dw-ahb-ssi version to the bindings.

Yes, I can see that in the diff. Tell me something useful here. Why 
do we need a new compatible? What does this compatible imply in the 
h/w that the existing ones don't. How do I know which compatible to 
use?

Really, this should probably only be a fallback with an SoC specific 
compatible. Future quirk properties which are not board specific only 
will be rejected. You've been warned.

> 
> Signed-off-by: Sudip Mukherjee <sudip.mukherjee@...ive.com>
> ---
>  Documentation/devicetree/bindings/spi/snps,dw-apb-ssi.yaml | 1 +
>  1 file changed, 1 insertion(+)
> 
> diff --git a/Documentation/devicetree/bindings/spi/snps,dw-apb-ssi.yaml b/Documentation/devicetree/bindings/spi/snps,dw-apb-ssi.yaml
> index d33b72fabc5d8..af36df67a4c0e 100644
> --- a/Documentation/devicetree/bindings/spi/snps,dw-apb-ssi.yaml
> +++ b/Documentation/devicetree/bindings/spi/snps,dw-apb-ssi.yaml
> @@ -45,6 +45,7 @@ properties:
>          enum:
>            - snps,dw-apb-ssi
>            - snps,dwc-ssi-1.01a
> +          - snps,dw-ahb-ssi
>        - description: Microsemi Ocelot/Jaguar2 SoC SPI Controller
>          items:
>            - enum:
> -- 
> 2.30.2
> 
>