From: Jonathan Cameron <jic23@kernel.org>
To: Daniel Baluta <daniel.baluta@intel.com>
Cc: Lars-Peter Clausen <lars@metafoo.de>,
Joel Becker <jlbec@evilplan.org>,
Hartmut Knaack <knaack.h@gmx.de>,
Linux Kernel Mailing List <linux-kernel@vger.kernel.org>,
"linux-iio@vger.kernel.org" <linux-iio@vger.kernel.org>,
"octavian.purdila@intel.com" <octavian.purdila@intel.com>,
Paul Bolle <pebolle@tiscali.nl>,
patrick.porlan@intel.com, adriana.reus@intel.com,
constantin.musca@intel.com, marten@intuitiveaerial.com
Subject: Re: [PATCH v5 3/4] iio: trigger: Introduce IIO hrtimer based trigger
Date: Thu, 07 May 2015 10:19:30 +0100 [thread overview]
Message-ID: <554B2E22.10807@kernel.org> (raw)
In-Reply-To: <CAEnQRZACZS=hC13rp7Ft_W8+2EYjLjddCOLr_=mbuKpj56=qqA@mail.gmail.com>
On 06/05/15 18:37, Daniel Baluta wrote:
> On Wed, May 6, 2015 at 8:16 PM, Jonathan Cameron <jic23@kernel.org> wrote:
>> On 06/05/15 17:25, Daniel Baluta wrote:
>>>
>>>
>>> On 05/05/2015 04:51 PM, Jonathan Cameron wrote:
>>>>
>>>>
>>>> On 4 May 2015 20:54:08 GMT+01:00, Lars-Peter Clausen <lars@metafoo.de> wrote:
>>>>> On 05/04/2015 12:50 PM, Daniel Baluta wrote:
>>>>> [...]
>>>>>> +IIO_HRTIMER_INFO_ATTR(sampling_frequency, S_IRUGO | S_IWUSR,
>>>>>> + iio_hrtimer_info_show_sampling_frequency,
>>>>>> + iio_hrtimer_info_store_sampling_frequency);
>>>>>
>>>>> I wonder if the sampling frequency should be configurable the regular
>>>>> IIO
>>>>> API, just like any other IIO device. But things like min/max sampling
>>>>> frequency should be configured in configfs.
>>>> Would have to be in the trigger dir rather than device... Makes sense to put it there.
>>>> Limits on it here seem like a sensible idea.
>>>
>>> But then each trigger will have sampling_frequency right? This is not what we want.
>> I'm confused now. Why not? Each hrtimer trigger created in configfs should have
>> it's own sampling frequency should it not?
>
> I was referring to triggers in general, not just hrtimer triggers.
>
> But I see now that we can set trig->dev.groups to point to our
> specific attributes. This
> should work.
>
> Anyhow, I'm not convinced that sampling_frequency should be configured
> from sysfs.
> We create the trigger from configfs:
>
> $ mkdir /config/triggers/hrtimer-instance0
>
> Then, likely we have to do something like this:
>
> $ echo 100 > /sys/bus/iio/trigger7/sampling_frequency
>
> How is the user application going to know which is the exact directory
> for hrtimer-instance0 ?
>
> Daniel.
>
Find it by name like we normally do?
J
next prev parent reply other threads:[~2015-05-07 9:19 UTC|newest]
Thread overview: 18+ messages / expand[flat|nested] mbox.gz Atom feed top
2015-05-04 10:50 [PATCH v5 0/4] Add initial configfs support for IIO Daniel Baluta
2015-05-04 10:50 ` [PATCH v5 1/4] iio: core: Introduce IIO software triggers Daniel Baluta
2015-05-04 20:11 ` Lars-Peter Clausen
2015-05-06 9:24 ` Daniel Baluta
2015-05-04 10:50 ` [PATCH v5 2/4] iio: core: Introduce IIO configfs support Daniel Baluta
2015-05-04 19:59 ` Lars-Peter Clausen
2015-05-05 13:48 ` Jonathan Cameron
2015-05-06 16:15 ` Daniel Baluta
2015-05-04 10:50 ` [PATCH v5 3/4] iio: trigger: Introduce IIO hrtimer based trigger Daniel Baluta
2015-05-04 19:54 ` Lars-Peter Clausen
2015-05-05 13:51 ` Jonathan Cameron
2015-05-06 16:25 ` Daniel Baluta
2015-05-06 17:16 ` Jonathan Cameron
2015-05-06 17:37 ` Daniel Baluta
2015-05-07 9:19 ` Jonathan Cameron [this message]
2015-05-07 10:26 ` Daniel Baluta
2015-05-07 18:26 ` Lars-Peter Clausen
2015-05-04 10:50 ` [PATCH v5 4/4] iio: Documentation: Add IIO configfs documentation Daniel Baluta
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