linux-kernel - Re: [PATCH 06/14] mfd: pxa-w1: MFD driver for PXA 1wire control + DS1WM chip

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Date:	Sun, 22 May 2011 22:00:27 +0200
From:	Samuel Ortiz <sameo@...ux.intel.com>
To:	Haojian Zhuang <haojian.zhuang@...il.com>
Cc:	Haojian Zhuang <haojian.zhuang@...vell.com>,
	linux-kernel@...r.kernel.org, dmitry.torokhov@...il.com,
	a.zummo@...ertech.it, johnpol@....mipt.ru, cbou@...l.ru,
	dwmw2@...radead.org, lrg@...mlogic.co.uk,
	broonie@...nsource.wolfsonmicro.com,
	linux-arm-kernel <linux-arm-kernel@...ts.infradead.org>
Subject: Re: [PATCH 06/14] mfd: pxa-w1: MFD driver for PXA 1wire control +
 DS1WM chip

Hi Haojian,

On Sat, May 14, 2011 at 10:21:25PM +0800, Haojian Zhuang wrote:
> On Tue, Apr 26, 2011 at 5:48 PM, Samuel Ortiz <sameo@...ux.intel.com> wrote:
> > Hi Haojian,
> >
> > On Mon, Apr 18, 2011 at 10:04:03PM +0800, Haojian Zhuang wrote:
> >> This driver provides registers and IRQ of PXA3xx chips to the ds1wm driver.
> > I see why this is needed, but I really think the ds1wm driver should be
> > converted to a regular platform device. The MFD driver below is just adding a
> > useless middle layer between your platform code and the ds1wm one.
> >
> I'm OK to use the regulator platform device for ds1wm driver except
> for one concern.
> ds1wm driver is designed for mfd cell driver. I need to update it as
> regulator platform
> driver first. cell->enable() / cell->disable() is used to enable clock
> for ds1wm driver.
> So I need to change the API from cell->enable/disable to clk_enable()
> / clk_disable().
> 
> But the key issue is that there's no common structure for clkdev. Now
> clkdev is only
> designed for deeply machine depend.
> 
> From my view is that we need a common structure for clkdev. Then mfd driver can
> get benefit from this. Some client driver can be written as regulator
> platform device.
> And mfd driver can use them seamless. What's your opinion?
I may be missing your point, but what is preventing you from calling the clock
API from drivers/w1/masters/ds1wm.c, the same way you're calling it from this
patch ?

Cheers,
Samuel.

-- 
Intel Open Source Technology Centre
http://oss.intel.com/
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