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

[Yixun Lan]

Hi Icenowy,

On 20:56 Sun 20 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.
> 
> This driver is tested to be able to power up the GPU on SpacemiT K3,
> however the following warning appears in the kernel log:
> 
> ```
> genpd_provider audio: Fail to power-off domain: 2
> ```
> 
This is kind of an expected issue, due to hardware design, the audio
power switch is coupled with rcpu core, which means power off it will
also shut down the rcpu, so the power switch currently is configured
as always on from software perspective, it's unable to power-off even
in Linux or rcpu once system up.

I will drop audio power domain control in next version

> (BTW I built it as a module to prevent whole kernel being rebuilt)
> 
that's fine

-- 
Yixun Lan (dlan)