linux-kernel - Re: [PATCH 1/5] regulator: s5m8767: Add symbols for hard-coded DVS

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Date:	Tue, 17 Dec 2013 15:06:33 +0100
From:	Krzysztof Kozlowski <k.kozlowski@...sung.com>
To:	Lee Jones <lee.jones@...aro.org>
Cc:	Rob Herring <rob.herring@...xeda.com>,
	Pawel Moll <pawel.moll@....com>,
	Mark Rutland <mark.rutland@....com>,
	Ian Campbell <ijc+devicetree@...lion.org.uk>,
	Kumar Gala <galak@...eaurora.org>,
	Rob Landley <rob@...dley.net>,
	Sangbeom Kim <sbkim73@...sung.com>,
	Samuel Ortiz <sameo@...ux.intel.com>,
	Liam Girdwood <lgirdwood@...il.com>,
	Mark Brown <broonie@...nel.org>,
	Grant Likely <grant.likely@...aro.org>,
	Sachin Kamat <sachin.kamat@...aro.org>,
	Thomas Abraham <thomas.abraham@...aro.org>,
	Amit Daniel Kachhap <amit.daniel@...sung.com>,
	devicetree@...r.kernel.org, linux-doc@...r.kernel.org,
	linux-kernel@...r.kernel.org,
	Kyungmin Park <kyungmin.park@...sung.com>,
	Marek Szyprowski <m.szyprowski@...sung.com>
Subject: Re: [PATCH 1/5] regulator: s5m8767: Add symbols for hard-coded
 DVS_RAMP register

On Tue, 2013-12-17 at 13:51 +0000, Lee Jones wrote:
> > Add symbols for hard-coded values of BUCK_RAMP field in DVS_RAMP
> > register. This simplifies a little the code as register update is called
> > only once.
> > 
> > Signed-off-by: Krzysztof Kozlowski <k.kozlowski@...sung.com>
> > Cc: Kyungmin Park <kyungmin.park@...sung.com>
> > Cc: Marek Szyprowski <m.szyprowski@...sung.com>
> > ---
> >  drivers/regulator/s5m8767.c         |   22 ++++++++++------------
> >  include/linux/mfd/samsung/s5m8767.h |   15 +++++++++++++++
> >  2 files changed, 25 insertions(+), 12 deletions(-)
> 
> <snip>
> 
> > diff --git a/include/linux/mfd/samsung/s5m8767.h b/include/linux/mfd/samsung/s5m8767.h
> > index 9198377ee859..2ab0b0f03641 100644
> > --- a/include/linux/mfd/samsung/s5m8767.h
> > +++ b/include/linux/mfd/samsung/s5m8767.h
> > @@ -186,4 +186,19 @@ enum s5m8767_regulators {
> >  #define S5M8767_ENCTRL_SHIFT		6
> >  #define S5M8767_ENCTRL_MASK		(0x3 << S5M8767_ENCTRL_SHIFT)
> >  
> > +/*
> > + * Values for BUCK_RAMP field in DVS_RAMP register, matching raw values
> > + * in mV/us.
> > + */
> > +enum s5m8767_dvs_buck_ramp_values {
> > +	S5M8767_DVS_BUCK_RAMP_5		= 0x4,
> > +	S5M8767_DVS_BUCK_RAMP_10	= 0x9,
> > +	S5M8767_DVS_BUCK_RAMP_12_5	= 0xb,
> > +	S5M8767_DVS_BUCK_RAMP_25	= 0xd,
> > +	S5M8767_DVS_BUCK_RAMP_50	= 0xe,
> > +	S5M8767_DVS_BUCK_RAMP_100	= 0xf,
> > +};
> 
> Why do these have to be enums?

There is no special need. I chose enum because it is a kind of
enumeration of all valid values for BUCK_RAMP field (valid according to
datasheet). If you prefer #define then I'll change it.


Best regards,
Krzysztof


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