[PATCH] pmdomain: amlogic: Keep Amlogic A9 ETH domain always on

[Ulf Hansson]

On Mon, Sep 14, 2026 at 12:40 PM Martin Blumenstingl
<martin.blumenstingl at googlemail.com> wrote:
>
> On Mon, Sep 14, 2026 at 10:56 AM Xianwei Zhao via B4 Relay
> <devnull+xianwei.zhao.amlogic.com at kernel.org> wrote:
> >
> > From: Qingpeng Yang <qingpeng.yang at amlogic.com>
> >
> > Mark the A9 ethernet power domain as always-on since it is required
> > for ethernet online wakeup and must not be powered down.
> Is "online wakeup" a wake up from suspend?
> If so: is the Ethernet controller listed with the "wakeup-source" flag
> in .dts{,i}?
> I'm wondering if the pmdomain and/or power (wakeup) frameworks in
> Linux have other ways of managing this case (e.g. only keeping the
> power domain active if needed).

We certainly do.

For in-band wakeup we have GENPD_FLAG_ACTIVE_WAKEUP. If this is set
for the genpd in question and the device being suspended is configured
for system wakeup (device_awake_path() returns true), the genpd will
remain powered on during system suspend, see genpd_finish_suspend().

In genpd_finish_suspend() we also support out-band wakeups via
checking device_out_band_wakeup(). Although, I guess that's not the
case here.

Kind regards
Uffe