Date: Wed, 11 Feb 2015 10:42:59 +0100
From: Sascha Hauer <s.hauer@pengutronix.de>
To: Lee Jones <lee.jones@linaro.org>
Cc: linux-arm-kernel@lists.infradead.org, linux-kernel@vger.kernel.org,
        eddie.huang@mediatek.com, Mark Brown <broonie@kernel.org>
Subject: Re: Recommendations for a new MFD device driver?
Message-ID: <20150211094259.GL12209@pengutronix.de>
References: <20150206101006.GK12209@pengutronix.de>
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On Tue, Feb 10, 2015 at 03:20:39PM +0800, Lee Jones wrote:
> On Fri, 06 Feb 2015, Sascha Hauer wrote:
> 
> > Hi All,
> > 
> > We are adding support for a new pretty typical MFD device, the MediaTek
> > MT6397. Initial patches are already posted. It's a PMIC which among other
> > things has regulators and a RTC. The same RTC is reused on another PMIC,
> > but with another register offset and another interrupt.
> > 
> > Now the question is where shall we put the register/irq resource
> > information?
> > 
> > 1) Put it into the RTC device driver.
> > 2) Put it into the .resource field of struct mfd_cell
> > 3) Put it into the device tree using standard reg, interrupt properties and
> >    a) Let the RTC driver interpret these
> >    b) Let the MFD driver create resources in the .resource field of struct
> >       mfd_cell
> >    c) Let the MFD core create the resources
> 
> I have no problem with 2, if that's the route you'd like to take.

Ok, thanks Lee and Mark for the input. I think we should go with option
2 then. While it's convenient to put the resources into the device tree
in the first place, it probably becomes cumbersome when Linux gets a
different idea how the subdevices of the PMIC should be arranged.

Sascha


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