[PATCH 14/15] net: phy: add PHY regulator support

Russell King - ARM Linux admin linux at armlinux.org.uk
Tue Jun 23 05:42:52 EDT 2020

On Tue, Jun 23, 2020 at 11:41:11AM +0200, Bartosz Golaszewski wrote:
> pon., 22 cze 2020 o 15:29 Russell King - ARM Linux admin
> <linux at armlinux.org.uk> napisał(a):
> >
> [snip!]
> >
> > This is likely to cause issues for some PHY drivers.  Note that we have
> > some PHY drivers which register a temperature sensor in the probe
> > function, which means they can be accessed independently of the lifetime
> > of the PHY bound to the network driver (which may only be while the
> > network device is "up".)  We certainly do not want hwmon failing just
> > because the network device is down.
> >
> > That's kind of worked around for the reset stuff, because there are two
> > layers to that: the mdio device layer reset support which knows nothing
> > of the PHY binding state to the network driver, and the phylib reset
> > support, but it is not nice.
> >
> Regulators are reference counted so if the hwmon driver enables it
> using mdio_device_power_on() it will stay on even after the PHY driver
> calls phy_device_power_off(), right? Am I missing something?

If that is true, you will need to audit the PHY drivers to add that.

RMK's Patch system: https://www.armlinux.org.uk/developer/patches/
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