On 19.01.2022 14:11:17, Marek Behún 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. If I understand your use-case correctly, you need different voltage p2p levels in the connection between the Ethernet MAC and the Ethernet switch or Ethernet-PHY? Some of the two wire Ethernet standards (10base-T1S, 10base-T1L, 100base-T1, 1000base-T1) defines several p2p voltage levels on the wire, i.e. between the PHYs. Alexandru has posed a series where you can specify the between-PHY voltage levels: | https://lore.kernel.org/all/20211210110509.20970-8-alexandru.tachici@xxxxxxxxxx/ Can we make clear that your binding specifies the voltage level on the MII interface, in contrast Alexandru's binding? regards, Marc -- Pengutronix e.K. | Marc Kleine-Budde | Embedded Linux | https://www.pengutronix.de | Vertretung West/Dortmund | Phone: +49-231-2826-924 | Amtsgericht Hildesheim, HRA 2686 | Fax: +49-5121-206917-5555 |
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