linux-kernel - Re: [PATCH v2 2/2] dt-bindings: net: adi,adin: document LP Termination property

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Message-ID: <20251227-perfect-accomplished-wildcat-4fcc75@quoll>
Date: Sat, 27 Dec 2025 13:29:36 +0100
From: Krzysztof Kozlowski <krzk@...nel.org>
To: Osose Itua <osose.itua@...oirfairelinux.com>
Cc: netdev@...r.kernel.org, devicetree@...r.kernel.org, 
	linux-kernel@...r.kernel.org, michael.hennerich@...log.com, 
	jerome.oufella@...oirfairelinux.com
Subject: Re: [PATCH v2 2/2] dt-bindings: net: adi,adin: document LP
 Termination property

On Mon, Dec 22, 2025 at 05:21:05PM -0500, Osose Itua wrote:
> Add "adi,low-cmode-impedance" boolean property which, when present,
> configures the PHY for the lowest common-mode impedance on the receive
> pair for 100BASE-TX operation.
> 
> Signed-off-by: Osose Itua <osose.itua@...oirfairelinux.com>
> ---
>  Documentation/devicetree/bindings/net/adi,adin.yaml | 6 ++++++
>  1 file changed, 6 insertions(+)
> 
> diff --git a/Documentation/devicetree/bindings/net/adi,adin.yaml b/Documentation/devicetree/bindings/net/adi,adin.yaml
> index c425a9f1886d..d3c8c5cc4bb1 100644
> --- a/Documentation/devicetree/bindings/net/adi,adin.yaml
> +++ b/Documentation/devicetree/bindings/net/adi,adin.yaml
> @@ -52,6 +52,12 @@ properties:
>      description: Enable 25MHz reference clock output on CLK25_REF pin.
>      type: boolean
>  
> +  adi,low-cmode-impedance:
> +    description: |
> +      Ability to configure for the lowest common-mode impedance on the

Either this is ability or you configure the PHY, as written in commit
msg. The latter suggests that's a SW property, not hardware, thus not
for bindings.

If the first, then why it is not implied by PHY itself - the compatible
(which is missing which makes this binding not selectable).

Best regards,
Krzysztof