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

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Date:   Mon, 30 Jan 2023 12:55:46 +0000
From:   "N, Pandith" <pandith.n@...el.com>
To:     "giometti@...eenne.com" <giometti@...eenne.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: PPS functionality for Intel Timed I/O

Hi Rodolfo Giometti,

This is regarding Intel Timed I/O device as PPS.

Intel Timed I/O is a precise device (10s of nanoseconds), that can send out pulses.
This is needed in IoT and server applications to measure offset between system clocks on multiple devices

We are planning to implement a driver, for PPS output functionality using Timed I/O device.

	1. Is there any support from PPS framework to start/stop pulse generation.
	If yes, can we get the Pin number, offset(start time) from user space ?

	2. Further, this device has the capability to capture the input events (pulses, nanosecond precision).
	The same PIN can work in either input or output mode.
	Can there be an PPS client driver supporting both modes ?

Regards,
Pandith