linux-kernel - Re: [PATCH v2 0/9] Simplify MFD Core

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Date:   Mon, 21 Oct 2019 12:39:57 +0100
From:   Lee Jones <lee.jones@...aro.org>
To:     Arnd Bergmann <arnd@...db.de>
Cc:     Daniel Thompson <daniel.thompson@...aro.org>,
        Mark Brown <broonie@...nel.org>,
        Linus Walleij <linus.walleij@...aro.org>,
        Barry Song <baohua@...nel.org>, stephan@...hold.net,
        "linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
        Linux ARM <linux-arm-kernel@...ts.infradead.org>,
        Daniel Drake <drake@...lessm.com>,
        Lubomir Rintel <lkundrak@...sk>,
        James Cameron <quozl@...top.org>
Subject: Re: [PATCH v2 0/9] Simplify MFD Core

On Mon, 21 Oct 2019, Arnd Bergmann wrote:

> On Mon, Oct 21, 2019 at 12:58 PM Lee Jones <lee.jones@...aro.org> wrote:
> >
> > MFD currently has one over-complicated user.  CS5535 uses a mixture of
> > cell cloning, reference counting and subsystem-level call-backs to
> > achieve its goal of requesting an IO memory region only once across 3
> > consumers.  The same can be achieved by handling the region centrally
> > during the parent device's .probe() sequence.  Releasing can be handed
> > in a similar way during .remove().
> >
> > While we're here, take the opportunity to provide some clean-ups and
> > error checking to issues noticed along the way.
> >
> > This also paves the way for clean cell disabling via Device Tree being
> > discussed at [0]
> >
> > [0] https://lkml.org/lkml/2019/10/18/612.
> 
> As the CS5535 is primarily used on the OLPC XO1, it would be
> good to have someone test the series on such a machine.
> 
> I've added a few people to Cc that may be able to help test it, or
> know someone who can.

Wonderful.  Thank you.

> For the actual patches, see
> https://lore.kernel.org/lkml/20191021105822.20271-1-lee.jones@linaro.org/T/#t
> 
>     Arnd

-- 
Lee Jones [李琼斯]
Linaro Services Technical Lead
Linaro.org │ Open source software for ARM SoCs
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