linux-kernel - Re: [PATCH 1/7] dt-bindings: dma: dma40: Prefer to pass sram through phandle

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Message-ID: <6344a399-5ebb-f244-d0a4-91ec74263a7c@linaro.org>
Date:   Tue, 18 Apr 2023 18:22:09 +0200
From:   Krzysztof Kozlowski <krzysztof.kozlowski@...aro.org>
To:     Linus Walleij <linus.walleij@...aro.org>,
        Vinod Koul <vkoul@...nel.org>,
        Rob Herring <robh+dt@...nel.org>,
        Krzysztof Kozlowski <krzysztof.kozlowski+dt@...aro.org>
Cc:     dmaengine@...r.kernel.org, devicetree@...r.kernel.org,
        linux-kernel@...r.kernel.org, linux-arm-kernel@...ts.infradead.org
Subject: Re: [PATCH 1/7] dt-bindings: dma: dma40: Prefer to pass sram through
 phandle

On 17/04/2023 09:55, Linus Walleij wrote:
> Extend the DMA40 bindings so that we can pass two SRAM
> segments as phandles instead of directly referring to the
> memory address in the second reg cell. This enables more
> granular control over the SRAM, and adds the optiona LCLA
> SRAM segment as well.
> 
> Deprecate the old way of passing LCPA as a second reg cell,
> make sram compulsory.
> 
> Signed-off-by: Linus Walleij <linus.walleij@...aro.org>
> ---
>  .../devicetree/bindings/dma/stericsson,dma40.yaml  | 35 +++++++++++++++++-----
>  1 file changed, 27 insertions(+), 8 deletions(-)
> 
> diff --git a/Documentation/devicetree/bindings/dma/stericsson,dma40.yaml b/Documentation/devicetree/bindings/dma/stericsson,dma40.yaml
> index 64845347f44d..4fe0df937171 100644
> --- a/Documentation/devicetree/bindings/dma/stericsson,dma40.yaml
> +++ b/Documentation/devicetree/bindings/dma/stericsson,dma40.yaml
> @@ -112,14 +112,23 @@ properties:
>        - const: stericsson,dma40
>  
>    reg:
> -    items:
> -      - description: DMA40 memory base
> -      - description: LCPA memory base
> +    oneOf:
> +      - items:
> +          - description: DMA40 memory base
> +      - items:
> +          - description: DMA40 memory base
> +          - description: LCPA memory base, deprecated, use eSRAM pool instead
> +        deprecated: true
> +
>  
>    reg-names:
> -    items:
> -      - const: base
> -      - const: lcpa
> +    oneOf:
> +      - items:
> +          - const: base
> +      - items:
> +          - const: base
> +          - const: lcpa
> +        deprecated: true
>  
>    interrupts:
>      maxItems: 1
> @@ -127,6 +136,14 @@ properties:
>    clocks:
>      maxItems: 1
>  
> +  sram:
> +    $ref: '/schemas/types.yaml#/definitions/phandle-array'

Drop quotes


> +    items:

Drop items...

> +      maxItems: 2

and this...

> +    description:
> +      List of phandles for the SRAM used by the DMA40 block, the first
> +      phandle is the LCPA memory, the second is the LCLA memory.

and all this, to write everything like:

items:
  - description: LCPA SRAM memory
  - description: ....


> +

> 

Best regards,
Krzysztof