linux-kernel - Re: [PATCH 1/3] dt-bindings: net: dp83826: add ti,cfg-dac-minus binding

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Date: Thu, 11 Jan 2024 18:20:30 +0100
From: Krzysztof Kozlowski <krzysztof.kozlowski@...aro.org>
To: Catalin Popescu <catalin.popescu@...ca-geosystems.com>,
 davem@...emloft.net, edumazet@...gle.com, kuba@...nel.org,
 pabeni@...hat.com, robh+dt@...nel.org, krzysztof.kozlowski+dt@...aro.org,
 conor+dt@...nel.org, afd@...com, andrew@...n.ch, hkallweit1@...il.com,
 linux@...linux.org.uk
Cc: netdev@...r.kernel.org, devicetree@...r.kernel.org,
 linux-kernel@...r.kernel.org
Subject: Re: [PATCH 1/3] dt-bindings: net: dp83826: add ti,cfg-dac-minus
 binding

On 11/01/2024 17:19, Catalin Popescu wrote:
> Add property ti,cfg-dac-minus to allow for voltage tuning
> of logical level -1 of the MLT-3 encoded data.

A nit, subject: drop second/last, redundant "binding". The "dt-bindings"
prefix is already stating that these are bindings.
See also:
https://elixir.bootlin.com/linux/v6.7-rc8/source/Documentation/devicetree/bindings/submitting-patches.rst#L18
> 
> Signed-off-by: Catalin Popescu <catalin.popescu@...ca-geosystems.com>
> ---
>  Documentation/devicetree/bindings/net/ti,dp83822.yaml | 9 +++++++++
>  1 file changed, 9 insertions(+)

Don't add properties one by one. Especially if they are related.

> 
> diff --git a/Documentation/devicetree/bindings/net/ti,dp83822.yaml b/Documentation/devicetree/bindings/net/ti,dp83822.yaml
> index db74474207ed..2f010333be49 100644
> --- a/Documentation/devicetree/bindings/net/ti,dp83822.yaml
> +++ b/Documentation/devicetree/bindings/net/ti,dp83822.yaml
> @@ -62,6 +62,15 @@ properties:
>         for the PHY.  The internal delay for the PHY is fixed to 3.5ns relative
>         to transmit data.
>  
> +  ti,cfg-dac-minus:
> +    description: |
> +       DP83826 PHY only.
> +       Sets the voltage ratio of the logical level -1 for the MLT-3 encoded data.

ratio between what and what?

> +       0 = 50%, 1 = 56.25%, 2 = 62.50%, 3 = 68.75%, 4 = 75%, 5 = 81.25%, 6 = 87.50%,
> +       7 = 93.75%, 8 = 100%, 9 = 106.25%, 10 = 112.50%, 11 = 118.75%, 12 = 125%,
> +       13 = 131.25%, 14 = 137.50%, 15 = 143.75%, 16 = 150%.
> +    enum: [0, 1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16]

Missing: "default:"


>  

Best regards,
Krzysztof