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

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Message-ID: <CAMRc=MdFDAmqcJ3PMsTbeZUb9imM+fzHzQ_9mQ1T=syDoCcQJw@mail.gmail.com>
Date: Wed, 19 Nov 2025 11:38:35 +0100
From: Bartosz Golaszewski <brgl@...ev.pl>
To: Charles Keepax <ckeepax@...nsource.cirrus.com>
Cc: David Rhodes <david.rhodes@...rus.com>, Richard Fitzgerald <rf@...nsource.cirrus.com>, 
	Lee Jones <lee@...nel.org>, Mark Brown <broonie@...nel.org>, 
	Andy Shevchenko <andriy.shevchenko@...ux.intel.com>, Philipp Zabel <p.zabel@...gutronix.de>, 
	Linus Walleij <linus.walleij@...aro.org>, Maciej Strozek <mstrozek@...nsource.cirrus.com>, 
	Andy Shevchenko <andy@...nel.org>, linux-sound@...r.kernel.org, 
	patches@...nsource.cirrus.com, linux-kernel@...r.kernel.org, 
	linux-spi@...r.kernel.org, 
	Bartosz Golaszewski <bartosz.golaszewski@...aro.org>
Subject: Re: [PATCH RFT/RFC] mfd: cs42l43: setup true links with software nodes

On Wed, Nov 19, 2025 at 10:58 AM Charles Keepax
<ckeepax@...nsource.cirrus.com> 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