linux-kernel - Re: [PATCH v2] mfd: max8997: use regmap to access registers

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Message-ID: <20140306162951.GA14318@core.coreip.homeip.net>
Date:	Thu, 6 Mar 2014 08:29:51 -0800
From:	Dmitry Torokhov <dmitry.torokhov@...il.com>
To:	Robert Baldyga <r.baldyga@...sung.com>
Cc:	sameo@...ux.intel.com, lee.jones@...aro.org,
	myungjoo.ham@...sung.com, cw00.choi@...sung.com,
	cooloney@...il.com, rpurdie@...ys.net, dbaryshkov@...il.com,
	dwmw2@...radead.org, lgirdwood@...il.com, broonie@...nel.org,
	a.zummo@...ertech.it, paul.gortmaker@...driver.com,
	linux-kernel@...r.kernel.org, linux-input@...r.kernel.org,
	linux-leds@...r.kernel.org, rtc-linux@...glegroups.com,
	m.szyprowski@...sung.com, k.kozlowski@...sung.com
Subject: Re: [PATCH v2] mfd: max8997: use regmap to access registers

On Thu, Mar 06, 2014 at 07:42:30AM +0100, Robert Baldyga wrote:
> Hi,
> 
> On 03/05/2014 07:54 PM, Dmitry Torokhov wrote:
> > Hi Robert,
> > 
> > On Wed, Mar 05, 2014 at 03:58:17PM +0100, Robert Baldyga wrote:
> >>  
> >> -int max8997_write_reg(struct i2c_client *i2c, u8 reg, u8 value)
> >> +int max8997_write_reg(struct regmap *map, u8 reg, u8 value)
> > 
> > Why don't you make read/write reg to take struct max8997_dev as argument
> > instead of regmap? regmap seems to be the current implementation du jur,
> > but that is core's detail, functions do not need to care.
> > 
> > Thanks.
> > 
> 
> It's because there are few regmaps in max8997_dev, and read/write reg
> functions has no way to check which regmap should be used. I think it
> would be clearer if I remove this functions and use regmap_read and
> regmap_write instead, because there is no particular purpose for them.

I see.. Then another question - why do the regmaps belong to the core
of the driver instead of individual functions? Why haptic regmap, for
example, can not be initialized in haptic code instead?

Thanks.

-- 
Dmitry
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