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

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Date: Fri, 12 Jan 2024 10:56:23 +0000
From: POPESCU Catalin <catalin.popescu@...ca-geosystems.com>
To: Andrew Lunn <andrew@...n.ch>
CC: "davem@...emloft.net" <davem@...emloft.net>, "edumazet@...gle.com"
	<edumazet@...gle.com>, "kuba@...nel.org" <kuba@...nel.org>,
	"pabeni@...hat.com" <pabeni@...hat.com>, "robh+dt@...nel.org"
	<robh+dt@...nel.org>, "krzysztof.kozlowski+dt@...aro.org"
	<krzysztof.kozlowski+dt@...aro.org>, "conor+dt@...nel.org"
	<conor+dt@...nel.org>, "afd@...com" <afd@...com>, "hkallweit1@...il.com"
	<hkallweit1@...il.com>, "linux@...linux.org.uk" <linux@...linux.org.uk>,
	"netdev@...r.kernel.org" <netdev@...r.kernel.org>,
	"devicetree@...r.kernel.org" <devicetree@...r.kernel.org>,
	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
	GEO-CHHER-bsp-development <bsp-development.geo@...ca-geosystems.com>
Subject: Re: [PATCH 1/3] dt-bindings: net: dp83826: add ti,cfg-dac-minus
 binding

On 11.01.24 17:47, Andrew Lunn wrote:
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>
>> These are not raw register values and these are not voltage values but
>> voltage ratios. I'm mapping the voltage ratios to enum values [0-16]
>> which are converted to register raw values by the driver. I don't see a
>> better way to do this.
> I assume 802.3 states what the actual voltage should be? So you can
> calculate what 50% of that is?
>
>            Andrew
The actual voltage depends on the mode (I know that for 100BASE-TX and 
MLT-3 it's +/-1V) : it makes no sense to try to code the actual voltage, 
we need to keep voltage ratio here.