linux-kernel - Re: PPS functionality for Intel Timed I/O

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Message-ID: <1e02cc71-baee-1e75-9160-062d563af795@enneenne.com>
Date:   Mon, 30 Jan 2023 15:26:55 +0100
From:   Rodolfo Giometti <giometti@...eenne.com>
To:     "N, Pandith" <pandith.n@...el.com>
Cc:     "linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
        "Sangannavar, Mallikarjunappa" 
        <mallikarjunappa.sangannavar@...el.com>,
        "D, Lakshmi Sowjanya" <lakshmi.sowjanya.d@...el.com>,
        "T R, Thejesh Reddy" <thejesh.reddy.t.r@...el.com>,
        "Hall, Christopher S" <christopher.s.hall@...el.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/Timed_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.

However pay attention to the fact that a PPS generator should be referred to 
system's main clock and not to peripherals' clock.

Ciao,

Rodolfo

-- 
GNU/Linux Solutions                  e-mail: giometti@...eenne.com
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