Re: [PATCH v3 1/3] dt-bindings: spi: renesas,rzv2h-rspi: allow multiple DMAs

[Geert Uytterhoeven]

On Wed, 28 Jan 2026 at 22:52, Cosmin Tanislav
<cosmin-gabriel.tanislav.xa@xxxxxxxxxxx> wrote:
> All supported SoCs have multiple DMA controllers that can be used with
> the RSPI peripheral. The current bindings only allow a single pair of RX
> and TX DMAs.
>
> The DMA core allows specifying multiple DMAs with the same name, and it
> will pick the first available one.
>
> There is an exception in the base dt-schema rules specifically for
> allowing this behavior (dtschema/schemas/dma/dma.yaml).
>
> dma-names:
>   anyOf:
>     - uniqueItems: true
>     - items:
>         # Hack around Renesas bindings which repeat entries to support
>         # multiple possible DMA providers
>         enum: [rx, tx]
>
> Allow multiple DMAs to have the same name and only restrict the possible
> names of the DMA channels, not their count.
>
> For RZ/T2H and RZ/N2H SoCs, limit the number of DMA channels to 6, as
> they have 3 DMA controllers.
>
> For RZ/V2H and RZ/V2N SoCs, limit the number of DMA channels to 10, as
> they have 5 DMA controllers.
>
> Signed-off-by: Cosmin Tanislav <cosmin-gabriel.tanislav.xa@xxxxxxxxxxx>
> ---
>
> V3:
>  * impose proper maxItems for each device
>  * impose maxItems for dmas property

FTR
Reviewed-by: Geert Uytterhoeven <geert+renesas@xxxxxxxxx>

Gr{oetje,eeting}s,

                        Geert

-- 
Geert Uytterhoeven -- There's lots of Linux beyond ia32 -- geert@xxxxxxxxxxxxxx

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                                -- Linus Torvalds