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Date:   Fri, 4 Feb 2022 19:18:27 -0800
From:   Florian Fainelli <>
To:     Rob Herring <>
Cc:     Marek BehĂșn <>,, Vladimir Oltean <>,
        Holger Brunck <>,
        Andrew Lunn <>,
        "" <>,
        Russell King <>,, Vinod Koul <>,
        Kishon Vijay Abraham I <>
Subject: Re: [PATCH devicetree v3] dt-bindings: phy: Add `tx-p2p-microvolt`
 property binding

On 2/4/2022 6:18 PM, Rob Herring wrote:
> On Fri, Jan 21, 2022 at 11:18:09AM -0800, Florian Fainelli wrote:
>> On 1/19/22 5:11 AM, Marek BehĂșn wrote:
>>> Common PHYs and network PCSes often have the possibility to specify
>>> peak-to-peak voltage on the differential pair - the default voltage
>>> sometimes needs to be changed for a particular board.
>>> Add properties `tx-p2p-microvolt` and `tx-p2p-microvolt-names` for this
>>> purpose. The second property is needed to specify the mode for the
>>> corresponding voltage in the `tx-p2p-microvolt` property, if the voltage
>>> is to be used only for speficic mode. More voltage-mode pairs can be
>>> specified.
>>> Example usage with only one voltage (it will be used for all supported
>>> PHY modes, the `tx-p2p-microvolt-names` property is not needed in this
>>> case):
>>>    tx-p2p-microvolt = <915000>;
>>> Example usage with voltages for multiple modes:
>>>    tx-p2p-microvolt = <915000>, <1100000>, <1200000>;
>>>    tx-p2p-microvolt-names = "2500base-x", "usb", "pcie";
>>> Add these properties into a separate file phy/transmit-amplitude.yaml,
>>> which should be referenced by any binding that uses it.
>> p2p commonly means peer to peer which incidentally could be confusing,
>> can you spell out the property entire:
>> tx-peaktopeak-microvolt or:
>> tx-pk2pk-microvolt for a more compact name maybe?
> Peer to peer makes little sense in terms of a voltage. I think this is
> fine as-is.

Understood, my point was that peer is a word that is commonly used in an 
environment where you are talking about networking equipment at large. 
Anyway, feel free to ignore it.

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