linux-kernel - Re: [PATCH 2/3] dt-bindings: net: snps,dwmac: Add time-based-scheduling property

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Date: Wed, 24 Jan 2024 16:07:48 +0000
From: Conor Dooley <conor@...nel.org>
To: Esben Haabendal <esben@...nix.com>
Cc: devicetree@...r.kernel.org, "David S. Miller" <davem@...emloft.net>,
	Eric Dumazet <edumazet@...gle.com>,
	Jakub Kicinski <kuba@...nel.org>, Paolo Abeni <pabeni@...hat.com>,
	Rob Herring <robh+dt@...nel.org>,
	Krzysztof Kozlowski <krzysztof.kozlowski+dt@...aro.org>,
	Conor Dooley <conor+dt@...nel.org>,
	Alexandre Torgue <alexandre.torgue@...s.st.com>,
	Giuseppe Cavallaro <peppe.cavallaro@...com>,
	Jose Abreu <joabreu@...opsys.com>, netdev@...r.kernel.org,
	linux-kernel@...r.kernel.org
Subject: Re: [PATCH 2/3] dt-bindings: net: snps,dwmac: Add
 time-based-scheduling property

On Wed, Jan 24, 2024 at 03:33:06PM +0100, Esben Haabendal wrote:
> Time Based Scheduling can be enabled per TX queue, if supported by the
> controller.

If time based scheduling is not supported by the controller, then the
property should not be present! The presence of a property like this
should mean that the feature is supported, using it is up to the
operating system.

That said, why is this a property that should be in DT? If support is
per controller is it not sufficient to use the compatible to determine
if this is supported?

Thanks,
Conor.

> 
> Signed-off-by: Esben Haabendal <esben@...nix.com>
> ---
>  Documentation/devicetree/bindings/net/snps,dwmac.yaml | 6 ++++++
>  1 file changed, 6 insertions(+)
> 
> diff --git a/Documentation/devicetree/bindings/net/snps,dwmac.yaml b/Documentation/devicetree/bindings/net/snps,dwmac.yaml
> index 5c2769dc689a..301e9150ecc3 100644
> --- a/Documentation/devicetree/bindings/net/snps,dwmac.yaml
> +++ b/Documentation/devicetree/bindings/net/snps,dwmac.yaml
> @@ -399,6 +399,12 @@ properties:
>              type: boolean
>              description: TX checksum offload is unsupported by the TX queue.
>  
> +          snps,time-based-scheduling:
> +            type: boolean
> +            description:
> +              Time Based Scheduling will be enabled for TX queue.
> +              This is typically not supported for TX queue 0.
> +
>          allOf:
>            - if:
>                required:
> -- 
> 2.43.0
> 

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