linux-kernel - RE: [PATCH 1/3] regulator: act8865: add PMIC(Power Management IC) driver

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Date:	Fri, 13 Dec 2013 07:10:36 +0000
From:	"Yang, Wenyou" <Wenyou.Yang@...el.com>
To:	Mark Brown <broonie@...nel.org>
CC:	"lgirdwood@...il.com" <lgirdwood@...il.com>,
	"grant.likely@...aro.org" <grant.likely@...aro.org>,
	"rob.herring@...xeda.com" <rob.herring@...xeda.com>,
	"vpalatin@...omium.org" <vpalatin@...omium.org>,
	"devicetree@...r.kernel.org" <devicetree@...r.kernel.org>,
	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
	"linux-doc@...r.kernel.org" <linux-doc@...r.kernel.org>,
	"linux-arm-kernel@...ts.infradead.org" 
	<linux-arm-kernel@...ts.infradead.org>,
	"plagnioj@...osoft.com" <plagnioj@...osoft.com>,
	"Ferre, Nicolas" <Nicolas.FERRE@...el.com>
Subject: RE: [PATCH 1/3] regulator: act8865: add PMIC(Power Management IC)
 driver

Hi Mark,

Thanks your for feedback.

> -----Original Message-----
> From: Mark Brown [mailto:broonie@...nel.org]
> Sent: Friday, December 13, 2013 12:52 AM
> To: Yang, Wenyou
> Cc: lgirdwood@...il.com; grant.likely@...aro.org;
> rob.herring@...xeda.com; vpalatin@...omium.org;
> devicetree@...r.kernel.org; linux-kernel@...r.kernel.org; linux-
> doc@...r.kernel.org; linux-arm-kernel@...ts.infradead.org;
> plagnioj@...osoft.com; Ferre, Nicolas
> Subject: Re: [PATCH 1/3] regulator: act8865: add PMIC(Power Management
> IC) driver
> 
> On Thu, Dec 12, 2013 at 09:18:49AM +0800, Wenyou Yang wrote:
> 
> The main thing with this driver seems to be that it needs a bit of
> modernisation to use current kernel features and APIs - there's nothing
> terribly wrong from a quick glance through but it needs an update.
> Details below.
> 
> > --- a/drivers/regulator/Kconfig
> > +++ b/drivers/regulator/Kconfig
> > @@ -577,5 +577,12 @@ config REGULATOR_WM8994
> >  	  This driver provides support for the voltage regulators on the
> >  	  WM8994 CODEC.
> >
> > +config REGULATOR_ACT8865
> > +	tristate "Active-semi act8865 voltage regulator"
> > +	depends on I2C
> > +	help
> > +	  This driver controls a active-semi act8865 voltage output
> > +	  regulator via I2C bus.
> > +
> 
> Please keep this and the Makefile sorted.
Only this one confuses me,
How can I sort it? By i2c interface, by regulator type: voltage or current?
Where is act8865 should be?

> 
> > +static int act8865_read_reg(struct act8865_data *act8865, u8 reg) {
> > +	int ret = i2c_smbus_read_byte_data(act8865->client, reg);
> > +	if (ret > 0)
> > +		ret &= 0xff;
> > +
> > +	return ret;
> > +}
> 
> Use regmap for register I/O and use the helpers provided by the core.
> 
> > +static int act8865_set_voltage_sel(struct regulator_dev *rdev, u32
> > +selector) {
> > +	struct act8865_data *act8865 = rdev_get_drvdata(rdev);
> > +	int id = rdev_get_id(rdev);
> > +	u32	reg = act8865_vset_reg_addr(act8865, id);
> 
> Throughout the file the indentation is a really strange mix of the first
> two lines (which are the normal kernel style) and the bottom line (which
> isn't).
> 
> > +	pr_info("%s: suspend voltage %dmV\n", rdev->desc->name, uV / 1000);
> 
> Remove noisy logging like this.
> 
> > +		rdev[i] = regulator_register(&act8865_reg[id], &config);
> 
> devm_regulator_register().
> 
> > +static int __init act8865_pmu_init(void) {
> > +	return i2c_add_driver(&act8865_pmu_driver);
> > +}
> > +subsys_initcall(act8865_pmu_init);
> 
> module_i2c_driver().

Others is OK for me, I will modify, and send out new version.

Thanks again.

Best Regards,
Wenyou Yang
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