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Date: Fri, 4 Feb 2022 20:18:40 -0600 From: Rob Herring <robh@...nel.org> To: Florian Fainelli <f.fainelli@...il.com> Cc: Marek BehĂșn <kabel@...nel.org>, devicetree@...r.kernel.org, Vladimir Oltean <olteanv@...il.com>, Holger Brunck <holger.brunck@...achienergy.com>, Andrew Lunn <andrew@...n.ch>, "netdev@...r.kernel.org" <netdev@...r.kernel.org>, Russell King <rmk+kernel@...linux.org.uk>, linux-phy@...ts.infradead.org, Vinod Koul <vkoul@...nel.org>, Kishon Vijay Abraham I <kishon@...com> Subject: Re: [PATCH devicetree v3] dt-bindings: phy: Add `tx-p2p-microvolt` property binding 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. Rob
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