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

[Yixun Lan]

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

-- 
Yixun Lan (dlan)