From: "N, Pandith" <pandith.n@intel.com>
To: Rodolfo Giometti <giometti@enneenne.com>
Cc: "linux-kernel@vger.kernel.org" <linux-kernel@vger.kernel.org>,
"Sangannavar,
Mallikarjunappa" <mallikarjunappa.sangannavar@intel.com>,
"D, Lakshmi Sowjanya" <lakshmi.sowjanya.d@intel.com>,
"T R, Thejesh Reddy" <thejesh.reddy.t.r@intel.com>,
"Hall, Christopher S" <christopher.s.hall@intel.com>
Subject: RE: PPS functionality for Intel Timed I/O
Date: Mon, 6 Feb 2023 10:16:49 +0000 [thread overview]
Message-ID: <BYAPR11MB32408E2D9758BD01EC65FB49E1DA9@BYAPR11MB3240.namprd11.prod.outlook.com> (raw)
In-Reply-To: <1e02cc71-baee-1e75-9160-062d563af795@enneenne.com>
Hi Rodolfo,
> -----Original Message-----
> From: Rodolfo Giometti <giometti@enneenne.com>
> Sent: Monday, January 30, 2023 7:57 PM
> To: N, Pandith <pandith.n@intel.com>
> Cc: linux-kernel@vger.kernel.org; Sangannavar, Mallikarjunappa
> <mallikarjunappa.sangannavar@intel.com>; D, Lakshmi Sowjanya
> <lakshmi.sowjanya.d@intel.com>; T R, Thejesh Reddy
> <thejesh.reddy.t.r@intel.com>; Hall, Christopher S
> <christopher.s.hall@intel.com>
> Subject: Re: PPS functionality for Intel Timed I/O
>
> On 30/01/23 15:11, N, Pandith wrote:
> > Here is a presentation link for Timed I/O device
> > https://lpc.events/event/16/contributions/1387/attachments/1051/2010/T
> > imed_IO_LPC.pdf
>
> Thanks. I'll take a look at it.
>
> > Intel Timed I/O PIN has both generator functionality and input capability.
> > Wanted to ask if it’s better to have two separate drivers, one under
> > client for input and other as generator driver for PPS output.
> > OR
> > Have a single client driver and user can choose the functionality
> > (either PPS output or as PPS source to capture pulses with timestamps).
> Within kernel sources PPS clients and PPS generators are placed into different
> directories, so I suppose is better to deploy two different pieces of code.
>
We are planning to add a new PPS generator driver in drivers/pps/generators
i) Can this driver use pps_register_source to register Intel Timed I/O device for pulse generation ?
ii) To start/stop pulse, we are planning to add additional sysfs attribute from our main driver.
Something like : /sys/class/ppsX/enable_pin
This is needed for users to start/stop pulse generation.
> However pay attention to the fact that a PPS generator should be referred to
> system's main clock and not to peripherals' clock.
>
We can sync with the system time for pulse generation.
> Ciao,
>
> Rodolfo
>
> --
> GNU/Linux Solutions e-mail: giometti@enneenne.com
> Linux Device Driver giometti@linux.it
> Embedded Systems phone: +39 349 2432127
> UNIX programming skype: rodolfo.giometti
Regards,
Pandith
next prev parent reply other threads:[~2023-02-06 10:17 UTC|newest]
Thread overview: 14+ messages / expand[flat|nested] mbox.gz Atom feed top
2023-01-30 12:55 PPS functionality for Intel Timed I/O N, Pandith
2023-01-30 13:45 ` Rodolfo Giometti
2023-01-30 14:11 ` N, Pandith
2023-01-30 14:26 ` Rodolfo Giometti
2023-02-06 10:16 ` N, Pandith [this message]
2023-02-06 10:46 ` Rodolfo Giometti
2023-02-15 7:09 ` N, Pandith
2023-02-15 7:46 ` Rodolfo Giometti
2023-10-06 5:31 ` N, Pandith
2023-10-06 6:23 ` Rodolfo Giometti
2023-10-06 8:34 ` andriy.shevchenko
2023-10-06 8:34 ` andriy.shevchenko
2023-10-06 8:57 ` Rodolfo Giometti
2023-10-06 9:06 ` andriy.shevchenko
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