netdev - Re: [PATCH net-next v4 1/3] dt-bindings: net: ethernet-phy: add property tx-amplitude-100base-tx-percent

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Message-ID: <Z6ykRRBXo4tac6XQ@shell.armlinux.org.uk>
Date: Wed, 12 Feb 2025 13:38:13 +0000
From: "Russell King (Oracle)" <linux@...linux.org.uk>
To: dimitri.fedrau@...bherr.com
Cc: Andrew Lunn <andrew+netdev@...n.ch>,
	"David S. Miller" <davem@...emloft.net>,
	Eric Dumazet <edumazet@...gle.com>,
	Jakub Kicinski <kuba@...nel.org>, Paolo Abeni <pabeni@...hat.com>,
	Rob Herring <robh@...nel.org>,
	Krzysztof Kozlowski <krzk+dt@...nel.org>,
	Conor Dooley <conor+dt@...nel.org>, Andrew Davis <afd@...com>,
	Andrew Lunn <andrew@...n.ch>,
	Heiner Kallweit <hkallweit1@...il.com>,
	Florian Fainelli <f.fainelli@...il.com>, netdev@...r.kernel.org,
	devicetree@...r.kernel.org, linux-kernel@...r.kernel.org,
	Dimitri Fedrau <dima.fedrau@...il.com>
Subject: Re: [PATCH net-next v4 1/3] dt-bindings: net: ethernet-phy: add
 property tx-amplitude-100base-tx-percent

On Tue, Feb 11, 2025 at 09:33:47AM +0100, Dimitri Fedrau via B4 Relay wrote:
> @@ -232,6 +232,12 @@ properties:
>        PHY's that have configurable TX internal delays. If this property is
>        present then the PHY applies the TX delay.
>  
> +  tx-amplitude-100base-tx-percent:
> +    description:
> +      Transmit amplitude gain applied for 100BASE-TX. When omitted, the PHYs
> +      default will be left as is.
> +    default: 100
> +

This should mention what the reference is - so 100% is 100% of what (it
would be the 802.3 specified 100BASE-TX level, but it should make that
clear.)

I'm having a hard time trying to find its specification in 802.3, so
maybe a reference to where it can be found would be useful, otherwise
it's unclear what one gets for "100%".

-- 
RMK's Patch system: https://www.armlinux.org.uk/developer/patches/
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