Re: [PATCH 2/5] dt-bindings: dma: dw: Add max burst transaction length property bindings

[Rob Herring <robh@kernel.org>]

On Fri, Mar 06, 2020 at 04:10:31PM +0300, Sergey.Semin@baikalelectronics.ru wrote:
> From: Serge Semin <Sergey.Semin@baikalelectronics.ru>
> 
> This array property is used to indicate the maximum burst transaction
> length supported by each DMA channel.
> 
> Signed-off-by: Serge Semin <Sergey.Semin@baikalelectronics.ru>
> Signed-off-by: Alexey Malahov <Alexey.Malahov@baikalelectronics.ru>
> Cc: Thomas Bogendoerfer <tsbogend@alpha.franken.de>
> Cc: Paul Burton <paulburton@kernel.org>
> Cc: Ralf Baechle <ralf@linux-mips.org>
> ---
>  .../devicetree/bindings/dma/snps,dma-spear1340.yaml  | 12 ++++++++++++
>  1 file changed, 12 insertions(+)
> 
> diff --git a/Documentation/devicetree/bindings/dma/snps,dma-spear1340.yaml b/Documentation/devicetree/bindings/dma/snps,dma-spear1340.yaml
> index d7f9383ceb8f..308ec6482064 100644
> --- a/Documentation/devicetree/bindings/dma/snps,dma-spear1340.yaml
> +++ b/Documentation/devicetree/bindings/dma/snps,dma-spear1340.yaml
> @@ -126,6 +126,18 @@ properties:
>            enum: [0, 1]
>            default: 0
>  
> +  snps,max-burst-len:
> +    description: |
> +      Maximum length of burst transactions supported by hardware.
> +      It's an array property with one cell per channel in units of
> +      CTLx register SRC_TR_WIDTH/DST_TR_WIDTH field.
> +    allOf:
> +      - $ref: /schemas/types.yaml#/definitions/uint32-array
> +      - maxItems: 8
> +        items:
> +          enum: [4, 8, 16, 32, 64, 128, 256]
> +          default: 0

The default needs to be an allowed value in the enum.

Rob