Re: [PATCH net-next 1/4] dt-bindings: net: document st,phy-wol property

[Gatien CHEVALLIER]

On 7/22/25 09:32, Russell King (Oracle) wrote:
> On Mon, Jul 21, 2025 at 05:56:17PM +0200, Gatien CHEVALLIER wrote:
> > Here's an extract from the Microchip datasheet for the LAN8742A PHY:
> >
> > "In addition to the main interrupts described in this section, an nPME
> > pin is provided exclusively for WoL specific interrupts."
>
> So the pin on the PHY for WoL is called nPME? If this pin isn't wired
> to an interrupt controller, then the PHY doesn't support WoL. If it is
> wired, then could it be inferred that WoL is supported?

For this PHY yes, but it's a bit more tricky. In my response to Andrew,
I added a bit more information.

> If so, then it seems to me the simple solution here is for the PHY
> driver to say "if the nPME pin is connected to an interrupt controller,
> then PHY-side WoL is supported, otherwise PHY-side WoL is not
> supported".

If there's a proper way to do this, sure!

> Then, I wonder if the detection of the WoL capabilities of the PHY
> in stmmac_init_phy() could be used to determine whether PHY WoL
> should be used or not.

Yes, sure.

Best regards,
Gatien