linux-kernel - Re: [PATCH v2] regmap: irq: allow different device for irq chip and regmap

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Message-ID: <20170705090829.gy36qcvsovtlnzx4@pengutronix.de>
Date:   Wed, 5 Jul 2017 11:08:29 +0200
From:   Michael Grzeschik <mgr@...gutronix.de>
To:     Mark Brown <broonie@...nel.org>
Cc:     linux-kernel@...r.kernel.org, kernel@...gutronix.de,
        Philipp Zabel <p.zabel@...gutronix.de>
Subject: Re: [PATCH v2] regmap: irq: allow different device for irq chip and
 regmap

On Tue, Jul 04, 2017 at 11:44:49AM +0100, Mark Brown wrote:
> On Fri, Jun 30, 2017 at 03:33:27PM +0200, Michael Grzeschik wrote:
> > On Fri, Jun 23, 2017 at 01:00:43PM +0100, Mark Brown wrote:
> 
> > > syscon is one potential thing here but it seems odd for the sort of
> > > hardware that syscon handles to be a good fit for regmap-irq.
> 
> > We have the special case that we use the syscon as the basic driver
> > underneath some subdevices that vary in function. We have six arcnet
> > controllers sitting side by side in an 8 byte offset. And after them we
> > have the next small memory windows for an reset controller and one
> > interrupt controller which the other devices reference.
> 
> Why is this a syscon and not a MFD?  It sounds exactly like a MFD to me,
> syscon is more for cases where things are really jumbled together (even
> in single registers) but that sounds like a bunch of separate register
> ranges for separate devices that happen to be very close together in
> address.

You are right. I will rewrite it to MFD.

Thanks,
Michael

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