[PATCH 2/3] pmdomain: spacemit: Add power domain driver

[Icenowy Zheng]

在 2026-09-18五的 23:01 +0000，Yixun Lan写道：
> Hi Icenowy, 
> 
> On 17:00 Fri 18 Sep     , Icenowy Zheng wrote:
> > 在 2026-09-18五的 02:40 +0000，Yixun Lan写道：
> > >   SpacemiT's PMU (Power Management Unit) consist of several power
> > > domains
> > > which can be managed independently, depending on different
> > > application
> > > scenario, each domain can be powered on/off for saving power.
> > > 
> > >   The driver is implemented based on Linux Generic PM Domain
> > > framework.
> > > From a hardware perspective, either of two distinct power-on
> > > sequences
> > > are supported, in software mode (SW mode), the driver is
> > > responsible
> > > for
> > > controlling the states of bits such as sleep1, sleep2, isolation
> > > and
> > > pwr_state, while in hardware mode (HW mode), the PMU hardware
> > > will
> > > complete
> > > the sequence automatically without requiring software
> > > intervention.
> > 
> > I think there also exists solutions for K3 that uses RPMI power
> > domains, and let their ESOS firmware to access the hardware.
> > 
> Yes, I'm aware of that
> 
> > What's the relationship of this implementation with the ESOS
> > implementation? Should the ESOS part be disabled to use this
> > implementation?
> > 
> I should say, it's a mutually exclusive solution, so yes, the ESOS
> part
> should be disabled in order to use this version
> 
> The motivation of this patch is trying to support drm/display
> driver's
> PM requirement, while avoid going with vendor's complicated RPMI
> solution
> which isn't mainline ready

Is this a long-term solution, or a temporary one?

If it's a temporary conflicting one, I don't think it's worth picking
at all.

Thanks,
Icenowy