On 27/06/2017 at 15:24:57 +0300, Kirill Esipov wrote:
> 2017-06-25 19:39 GMT+03:00 Andy Shevchenko <andy.shevchenko@xxxxxxxxx>:
> > On Thu, Jun 22, 2017 at 7:58 PM, Kirill Esipov <yesipov@xxxxxxxxx> wrote:
> >> DS3232/DS3234 has the temperature registers with a resolution of 0.25
> >> degree celsius. This enables to get the value through hwmon.
> >>
> >> # cat /sys/class/hwmon/hwmon0/temp1_input
> >> 37250
> >
> >> +config RTC_DRV_DS3232_HWMON
> >> + bool "HWMON support for Dallas/Maxim DS3232/DS3234"
> >
> >> + depends on RTC_DRV_DS3232 && HWMON
> >> + depends on !(RTC_DRV_DS3232=y && HWMON=m)
> >
> > Perhaps it might be squeezed into one line (something like that logic
> > has been required by I2C related PMIC IIRC)
> >
> >> + default y
> >
> > Is it really sane default?
> >
>
> At first sight i thought that yes it is sane default (and others RTC with
> hwmon set it "default y" (ds1307, rv3029c2)).
> But if it's not sane, then we should turn it off by default in others drivers?
>
It is definitively sane.
>
> >> +#ifdef CONFIG_RTC_DRV_DS3232_HWMON
> >
> > IS_BUILTIN() ?
> >
I'd use IS_ENABLED in that case.
> >> +static int ds3232_hwmon_read_temp(struct device *dev, long int *mC)
> >> +{
> >> + struct ds3232 *ds3232 = dev_get_drvdata(dev);
> >> + u8 temp_buf[2];
> >> + s16 temp;
> >> + int ret;
> >> +
> >> + ret = regmap_bulk_read(ds3232->regmap, DS3232_REG_TEMPERATURE, temp_buf,
> >> + sizeof(temp_buf));
> >
> >> +
> >
> > Remove.
I'd recommend running checkpatch.pl --strict to remove the remaining
whitespace issues too (a few alignments are off).
> >
> > I dunno which style is preferred, though you may use
> > if (IS_BUILTIN(...))
> > return;
> >
> > at the beginning of the function and allow gcc optimizer to take care
> > of everything else.
> >
I don't have a strong opinion there.
--
Alexandre Belloni, Free Electrons
Embedded Linux and Kernel engineering
http://free-electrons.com
