[alsa-devel] [PATCH v2] ASoC: SGTL5000: Fix kernel failed while trying to get optional VDDD supply.

[Li.Xiubo at freescale.com]

> > 2, If the regulator dt node is exist but the optional VDDD is absent (i.e.
> > The external VDDD is not used), a -EPROBE_DEFER will be returned, if
> > just return the -EPROBE_DEFER to the probe(and then the probe deferral
> > mechanism will do the probe again later, is that right ?), and then
> > the
> > regulator_get_optional() will be called later again, and the
> > -EPROBE_DEFER will be returned again too, and now how should I handle
> > -EPROBE_DEFER error twice ? Or should there be a counter about this ?
> > That to say when the -EPROBE_DEFER error is the second time returned
> > from regulator_get_optional() can we ensure that the optional VDDD is really
> not in use.
> 
> The driver should just defer when it's told to defer, I don't understand why it
> would want to count anything?
>

It's just one idea for the special handling of regulator_get_optional() in this
case.

--
Xiubo