linux-kernel - Re: [PATCH v4 3/3] mfd: vortex: implement new driver for Vortex southbridges

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Message-ID: <20250903091437.GF2163762@google.com>
Date: Wed, 3 Sep 2025 10:14:37 +0100
From: Lee Jones <lee@...nel.org>
To: Marcos Del Sol Vives <marcos@...a.pet>
Cc: linux-kernel@...r.kernel.org, Linus Walleij <linus.walleij@...aro.org>,
	Bartosz Golaszewski <brgl@...ev.pl>,
	Michael Walle <mwalle@...nel.org>,
	Bjorn Helgaas <bhelgaas@...gle.com>, linux-gpio@...r.kernel.org,
	linux-pci@...r.kernel.org
Subject: Re: [PATCH v4 3/3] mfd: vortex: implement new driver for Vortex
 southbridges

On Wed, 03 Sep 2025, Marcos Del Sol Vives wrote:

> El 03/09/2025 a las 9:21, Lee Jones escribió:
> >> vortex_dx_sb are "struct vortex_southbridge" type, not raw MFD API data.
> > 
> > I like your style, but nope!
> > 
> > vortex_southbridge contains MFD data and shouldn't exist anyway.
> 
> I'm not sure if I follow.
> 
> You're suggesting not using driver_data at all and using a big "if" instead,
> matching manually myself on the correct cells to register against the PCI
> device ID, instead of relying on PCI matching giving me already the cells
> structure inside driver_data?

Yes.

> That seems to increase code size and be more error prone for no reason.

It may make sense for your use-case, but believe me, I've seen some
crazy implementations of this.  I found it's easier just to have a no
cross contamination of early init APSs rule and call it a day.

-- 
Lee Jones [李琼斯]