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Message-ID: <1209b7cf-5be2-4107-aa6b-d67a32ea3737@linaro.org>
Date: Fri, 2 Feb 2024 11:47:34 +0100
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Subject: Re: [PATCH v2] dt-bindings: media: Add sram-size Property for Wave5
To: Brandon Brnich <b-brnich@ti.com>, Nas Chung <nas.chung@chipsnmedia.com>,
 Jackson Lee <jackson.lee@chipsnmedia.com>,
 Mauro Carvalho Chehab <mchehab@kernel.org>, Rob Herring
 <robh+dt@kernel.org>, Krzysztof Kozlowski
 <krzysztof.kozlowski+dt@linaro.org>, Conor Dooley <conor+dt@kernel.org>,
 linux-media@vger.kernel.org, devicetree@vger.kernel.org,
 linux-kernel@vger.kernel.org, Nishanth Menon <nm@ti.com>,
 Vignesh Raghavendra <vigneshr@ti.com>
Cc: Darren Etheridge <detheridge@ti.com>
References: <20240201184238.2542695-1-b-brnich@ti.com>
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From: Krzysztof Kozlowski <krzysztof.kozlowski@linaro.org>
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In-Reply-To: <20240201184238.2542695-1-b-brnich@ti.com>
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On 01/02/2024 19:42, Brandon Brnich wrote:
> Wave521c has capability to use SRAM carveout to store reference data with
> purpose of reducing memory bandwidth. To properly use this pool, the driver
> expects to have an sram and sram-size node. Without sram-size node, driver
> will default value to zero, making sram node irrelevant.

I am sorry, but what driver expects should not be rationale for new
property. This justification suggests clearly it is not a property for DT.

> 
> Signed-off-by: Brandon Brnich <b-brnich@ti.com>
> ---

This is v2, so where is the changelog?

>  Documentation/devicetree/bindings/media/cnm,wave521c.yaml | 7 +++++++
>  1 file changed, 7 insertions(+)
> 
> diff --git a/Documentation/devicetree/bindings/media/cnm,wave521c.yaml b/Documentation/devicetree/bindings/media/cnm,wave521c.yaml
> index 6a11c1d11fb5..ea5469eb38f9 100644
> --- a/Documentation/devicetree/bindings/media/cnm,wave521c.yaml
> +++ b/Documentation/devicetree/bindings/media/cnm,wave521c.yaml
> @@ -43,6 +43,12 @@ properties:
>        storing it on DMA memory. It is mainly used for the purpose of reducing
>        bandwidth.
>  
> +  sram-size:

Does not look like standard property. You would need vendor prefix or is
it documented anywhere already?

> +    $ref: /schemas/types.yaml#/definitions/uint32
> +    description:
> +      SRAM size reserved for VPU operations. If not specified, size will default
> +      to zero.

Lack of sram property means 0, doesn't it?

> +
>  required:
>    - compatible
>    - reg
> @@ -58,4 +64,5 @@ examples:
>          clocks = <&clks 42>;
>          interrupts = <42>;
>          sram = <&sram>;
> +        sram-size = <0x1234>;

Was this patch tested? Since nothing changed from v1, I assume it also
fails.

>      };

Best regards,
Krzysztof