Re: [PATCH RFT/RFC] mfd: cs42l43: setup true links with software nodes

[Bartosz Golaszewski]

On Wed, Nov 19, 2025 at 10:58 AM Charles Keepax
<ckeepax@xxxxxxxxxxxxxxxxxxxxx> wrote:
>
> > > > Hi Charles!
> > > >
> > > > Please give this a try. It's only build-tested so far. I hope I
> > > > understood correctly that it's the SPI driver that needs the "cs" GPIO
> > > > from the pinctrl.
> > >
> > > Unfortunately it fails with an -EBUSY on adding the MFD children.
> > > I will investigate a little more and report back.
> >
> > Does it fail in device_add_software_node() in MFD core? Is it possible
> > that the device already has a software node for some reason?
>
> Yeah it seems there is already a software node, although somewhat
> at a loss as to why, the only ones we add are inside the SPI
> driver. I will poke further and see if I can find out how it
> acquires that node.
>

Let me know if you figure it out, I'll submit a v2 that doesn't drop
the undefined swnode.

Bart