linux-kernel - Re: [PATCH] staging: iio: fix coding style

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Date:	Mon, 14 Apr 2014 10:40:03 +0100
From:	Dan O'Donovan <dan@...tex.com>
To:	Jonathan Cameron <jic23@...nel.org>
Cc:	Joel Porquet <joel@...quet.org>, gregkh@...uxfoundation.org,
	jg1.han@...sung.com, linux-iio@...r.kernel.org,
	devel@...verdev.osuosl.org, linux-kernel@...r.kernel.org
Subject: Re: [PATCH] staging: iio: fix coding style

On Sat, 2014-04-12 at 18:28 +0100, Jonathan Cameron wrote:
> On 09/04/14 19:09, Joel Porquet wrote:
> > As suggested by checkpatch.pl, use dev_info() instead of
> > printk(KERN_INFO ...) to print message.
> >
> > Signed-off-by: Joel Porquet <joel@...quet.org>
> > ---
> > Only tested by compilation.
> >   drivers/staging/iio/trigger/iio-trig-periodic-rtc.c | 3 ++-
> >   1 file changed, 2 insertions(+), 1 deletion(-)
> >
> > diff --git a/drivers/staging/iio/trigger/iio-trig-periodic-rtc.c b/drivers/staging/iio/trigger/iio-trig-periodic-rtc.c
> > index 48a6afa..38ecb4b 100644
> > --- a/drivers/staging/iio/trigger/iio-trig-periodic-rtc.c
> > +++ b/drivers/staging/iio/trigger/iio-trig-periodic-rtc.c
> > @@ -33,7 +33,8 @@ static int iio_trig_periodic_rtc_set_state(struct iio_trigger *trig, bool state)
> >   	struct iio_prtc_trigger_info *trig_info = iio_trigger_get_drvdata(trig);
> >   	if (trig_info->frequency == 0)
> >   		return -EINVAL;
> > -	printk(KERN_INFO "trigger frequency is %d\n", trig_info->frequency);
> > +	dev_info(&trig_info->rtc->dev, "trigger frequency is %d\n",
> > +			trig_info->frequency);
> The principle is good, but why make the error message us the underlying rtc device?
> Going to lead to a rather unhelpful error message.
> 
> Perhaps the iio_trigger structures device element would make more sense?
> Might not be terribly informative, but will at least come from the right
> subsystem.
> 
> Also, I think we will be dropping this driver entirely at some point.
> It was a dodgy hack that perhaps made sense at the time, but now a high
> resolution timer is going to give better results.

I've been using this patch from Denis Ciocca which implements a hr-timer
trigger, and it has worked well for me:
http://comments.gmane.org/gmane.linux.kernel.iio/9698
It would be great to see this added to the kernel.

> >   	return rtc_irq_set_state(trig_info->rtc, &trig_info->task, state);
> >   }
> >
> >
> 
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