linux-kernel - Re: platform data and mfd design question

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Date:	Wed, 16 Feb 2011 08:53:49 -0800
From:	Mark Brown <broonie@...nsource.wolfsonmicro.com>
To:	Linus Walleij <linus.walleij@...ricsson.com>
Cc:	Abhijeet Dharmapurikar <adharmap@...eaurora.org>,
	"dilinger@...ued.net" <dilinger@...ued.net>,
	Samuel Ortiz <sameo@...ux.intel.com>,
	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
	"linux-arm-kernel@...ts.infradead.org" 
	<linux-arm-kernel@...ts.infradead.org>,
	Ian Lartey <ian@...nsource.wolfsonmicro.com>,
	Dimitris Papastamos <dp@...nsource.wolfsonmicro.com>,
	Srinidhi KASAGAR <srinidhi.kasagar@...ricsson.com>,
	Michael Hennerich <michael.hennerich@...log.com>,
	"linux-arm-msm@...r.kernel.org" <linux-arm-msm@...r.kernel.org>
Subject: Re: platform data and mfd design question

On Wed, Feb 16, 2011 at 09:48:33AM +0100, Linus Walleij wrote:
> On 02/15/2011 10:51 PM, Abhijeet Dharmapurikar wrote:
> >Msm on the other hand declares the struct mfd_cell subdevice[] array in
> >the board file and passes this on to the core driver via platfom data.

> This way the platform data tells the core driver what kind of
> silicon it has "hey, PM8058, guess what, you have an RTC!"
> which looks backwards to me, especially given that it does
> not need any fancy platform data at all, just two IRQ numbers
> which the core driver can very well handle.

Indeed, and the RTC would still be useful even without IRQ support I
imagine (it should still be able to tell you the time).
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