Re: [PATCH net-next 3/3] net: fec: reset phy on resume after power-up

Francesco Dolcini
2021-12-15T19:49:18Z

On Wed, Dec 15, 2021 at 08:34:00PM +0100, Andrew Lunn wrote:
> > The reason is that the power consumption in reset is higher in reset
> > compared to the normal PHY software power down.
>
> Does the datasheet have numbers for in lower power mode and held in
> reset? We only have an issue if held in reset when in low power mode
> consumes more power than simply in low power mode.

The numbers for KSZ9131, Table 6-3: Power Consumption from datasheet [0]

61.2mW in reset, 24.4mW in software power down (3.3VDD)
40.9mW in reset, 12.5mW in software power down (2.5VDD)

Francesco

[0] https://ww1.microchip.com/downloads/en/DeviceDoc/00002841B.pdf