linux-kernel - Re: [PATCH v4 1/5] dt-bindings: spi: sun6i: add DT bindings for Allwinner R329/D1/R528/T113s SPI

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Date:   Sun, 7 May 2023 23:40:49 +0100
From:   Andre Przywara <andre.przywara@....com>
To:     Maksim Kiselev <bigunclemax@...il.com>
Cc:     Icenowy Zheng <icenowy@...c.io>,
        Krzysztof Kozlowski <krzysztof.kozlowski@...aro.org>,
        Mark Brown <broonie@...nel.org>,
        Rob Herring <robh+dt@...nel.org>,
        Krzysztof Kozlowski <krzysztof.kozlowski+dt@...aro.org>,
        Conor Dooley <conor+dt@...nel.org>,
        Chen-Yu Tsai <wens@...e.org>,
        Jernej Skrabec <jernej.skrabec@...il.com>,
        Samuel Holland <samuel@...lland.org>,
        Paul Walmsley <paul.walmsley@...ive.com>,
        Palmer Dabbelt <palmer@...belt.com>,
        Albert Ou <aou@...s.berkeley.edu>,
        Cristian Ciocaltea <cristian.ciocaltea@...labora.com>,
        Maxime Ripard <mripard@...nel.org>, linux-spi@...r.kernel.org,
        devicetree@...r.kernel.org, linux-arm-kernel@...ts.infradead.org,
        linux-sunxi@...ts.linux.dev, linux-kernel@...r.kernel.org,
        linux-riscv@...ts.infradead.org
Subject: Re: [PATCH v4 1/5] dt-bindings: spi: sun6i: add DT bindings for
 Allwinner R329/D1/R528/T113s SPI

On Sun,  7 May 2023 18:03:33 +0300
Maksim Kiselev <bigunclemax@...il.com> wrote:

Hi,

> Listed above Allwinner SoCs has two SPI controllers. First is the regular
> SPI controller and the second one has additional functionality for
> MIPI-DBI Type C.
> 
> Add compatible strings for these controllers
> 
> Signed-off-by: Maksim Kiselev <bigunclemax@...il.com>
> Acked-by: Krzysztof Kozlowski <krzysztof.kozlowski@...aro.org>
> ---
>  .../devicetree/bindings/spi/allwinner,sun6i-a31-spi.yaml   | 7 +++++++
>  1 file changed, 7 insertions(+)
> 
> diff --git a/Documentation/devicetree/bindings/spi/allwinner,sun6i-a31-spi.yaml b/Documentation/devicetree/bindings/spi/allwinner,sun6i-a31-spi.yaml
> index de36c6a34a0f..ab2d8a03011e 100644
> --- a/Documentation/devicetree/bindings/spi/allwinner,sun6i-a31-spi.yaml
> +++ b/Documentation/devicetree/bindings/spi/allwinner,sun6i-a31-spi.yaml
> @@ -19,6 +19,7 @@ properties:
>  
>    compatible:
>      oneOf:
> +      - const: allwinner,sun50i-r329-spi
>        - const: allwinner,sun6i-a31-spi
>        - const: allwinner,sun8i-h3-spi
>        - items:
> @@ -28,6 +29,12 @@ properties:
>                - allwinner,sun50i-h616-spi
>                - allwinner,suniv-f1c100s-spi
>            - const: allwinner,sun8i-h3-spi
> +      - items:
> +          - enum:
> +              - allwinner,sun20i-d1-spi
> +              - allwinner,sun20i-d1-spi-dbi
> +              - allwinner,sun50i-r329-spi-dbi
> +          - const: allwinner,sun50i-r329-spi

So this is still not right: It allows:
"allwinner,sun20i-d1-spi-dbi", "allwinner,sun50i-r329-spi"
which it shouldn't, but more importantly disallows the three string
version that is introduced in patch 5/5, which makes dtbs_check fail.
So we need to fix this. I think the simplest is probably:

+      - items:
+          - enum:
+              - allwinner,sun20i-d1-spi
+              - allwinner,sun50i-r329-spi-dbi
+          - const: allwinner,sun50i-r329-spi
+      - items:
+          - const: allwinner,sun20i-d1-spi-dbi
+          - const: allwinner,sun50i-r329-spi-dbi
+          - const: allwinner,sun50i-r329-spi

Maybe there is a shorter sequence.
This assumes we go with the three-string combo, of course.

Cheers,
Andre


>  
>    reg:
>      maxItems: 1