linux-kernel - Re: [PATCH v2 2/2] mfd: lm3533: convert to use OF

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Message-ID: <CAPVz0n19D1mS_prvMo-HD3m7U9+iknm49JSj5ydNUHoqjK7gZw@mail.gmail.com>
Date: Wed, 19 Feb 2025 19:39:29 +0200
From: Svyatoslav Ryhel <clamor95@...il.com>
To: Andy Shevchenko <andriy.shevchenko@...ux.intel.com>
Cc: Lee Jones <lee@...nel.org>, Rob Herring <robh@...nel.org>, 
	Krzysztof Kozlowski <krzk+dt@...nel.org>, Conor Dooley <conor+dt@...nel.org>, 
	Jonathan Cameron <jic23@...nel.org>, Lars-Peter Clausen <lars@...afoo.de>, Pavel Machek <pavel@....cz>, 
	Daniel Thompson <danielt@...nel.org>, Jingoo Han <jingoohan1@...il.com>, Helge Deller <deller@....de>, 
	Uwe Kleine-König <u.kleine-koenig@...libre.com>, 
	devicetree@...r.kernel.org, linux-kernel@...r.kernel.org, 
	linux-iio@...r.kernel.org, linux-leds@...r.kernel.org, 
	dri-devel@...ts.freedesktop.org, linux-fbdev@...r.kernel.org
Subject: Re: [PATCH v2 2/2] mfd: lm3533: convert to use OF

ср, 19 лют. 2025 р. о 17:56 Andy Shevchenko
<andriy.shevchenko@...ux.intel.com> пише:
>
> On Wed, Feb 19, 2025 at 05:13:15PM +0200, Svyatoslav Ryhel wrote:
> > ср, 19 лют. 2025 р. о 17:07 Andy Shevchenko
> > <andriy.shevchenko@...ux.intel.com> пише:
> > > On Wed, Feb 19, 2025 at 04:36:38PM +0200, Svyatoslav Ryhel wrote:
> > > > ср, 19 лют. 2025 р. о 16:27 Andy Shevchenko
> > > > <andriy.shevchenko@...ux.intel.com> пише:
>
> ...
>
> > > > MFD part is removed since MFD cells binding is unconditional, while
> > > > the device supports any amount of children grater then one. For
> > > > example, my  device uses only backlight at bank A, while all other
> > > > subdevices are not present and used. This patch switches to dynamic
> > > > bind of children.
> > >
> > > MFD does the same. Please, take your time and get familiar with how MFD works.
> >
> > It does not. I have tried. If mfd cell binding is missing, driver will
> > complain and fail.
>
> I really don't know what exactly is going on here, you can check it later, but
> I'm 100% sure that MFD works for only driver that are present. What you are
> describing is how component framework is designed.
>
> To proove my words you can check drivers/mfd/intel_soc_pmic_*.c and find listed
> cells that never had a driver in the Linux kernel. They are just placeholders.
>

This example is not valid since those drivers do not use device tree.

> ...
>
> > > --
> > > With Best Regards,
> > > Andy Shevchenko
>
> Please, when answering, remove unrelated context from the replies.
>
> ...
>
> > Let this driver rot for now, I might return to it. At some point
>
> Up to you. But thanks for trying!
>

Thank you for suggestions. Once I complete more urgent tasks, I might
do some tinkering with this driver.

> --
> With Best Regards,
> Andy Shevchenko
>
>