Re: [PATCH] iio: flow: slf3s: restart measurement if VDD disable fails

On Thu, Aug 06, 2026 at 02:55:25PM +0200, Wadim Mueller wrote:
> On Thu Aug 6, 2026 at 11:39 AM CEST, Nuno Sá wrote:
> > On Wed, Aug 05, 2026 at 07:02:55PM +0800, Linmao Li wrote:
> >
> > I'm also not sure about the above. If the regulator fails to disable I
> > would say things are already in a bad state anyways. Is there any strong
> > reason to do `slf3s_send_cmd(sf->client, slf3s_cmd_stop_meas)` before
> > disabling vdd? I would assume that without vdd things will terminate
> > anyways. Asking because if we just disable it then the above stops
> > being a question. Though I do understand it's better to gracefully
> > terminate things. Just not sure if there's any added value for that in
> > this path.
> 
> on quite a few boards vdd is tied directly to the always-on rail, so there's
> no real supply node in the DT and the regulator core falls back to a dummy regulator there
> regulator_disable() becomes a pure no-op that always returns success without  actually removing power.
> so we can't rely on cutting vdd to stop the sensor

Oh yeah! That make total sense so dummy me :)

- Nuno Sá

> 
> Wadim
> 
> >
> > Just my 2 cents. No strong feelings so if the driver author is fine with
> > this, also looks like a sensible change.
> >
> > - Nuno Sá
> >
> > >  }
> > >  
> > >  static int slf3s_resume(struct device *dev)
> > > 
> > > base-commit: 0efaefce4e95a3331550329c0078b2fb38b3ff1f
> > > -- 
> > > 2.25.1
> > > 
>