LKML Archive on lore.kernel.org
help / color / mirror / Atom feed
From: Felipe Balbi <felipe.balbi@linux.intel.com>
To: Richard Cochran <richardcochran@gmail.com>
Cc: netdev@vger.kernel.org, Thomas Gleixner <tglx@linutronix.de>,
	Ingo Molnar <mingo@redhat.com>, Borislav Petkov <bp@alien8.de>,
	"H . Peter Anvin" <hpa@zytor.com>,
	x86@kernel.org, linux-kernel@vger.kernel.org,
	"Christopher S . Hall" <christopher.s.hall@intel.com>,
	Felipe Balbi <felipe.balbi@linux.intel.com>
Subject: [RFC PATCH 0/5] PTP: add support for Intel's TGPIO controller
Date: Tue, 16 Jul 2019 10:20:33 +0300	[thread overview]
Message-ID: <20190716072038.8408-1-felipe.balbi@linux.intel.com> (raw)

TGPIO is a new IP which allows for time synchronization between systems
without any other means of synchronization such as PTP or NTP. The
driver is implemented as part of the PTP framework since its features
covered most of what this controller can do.

There are a few things that made me send this as a RFC, however:

(1) This version of the controller lacks an interrupt line. Currently I
	put a kthread that starts polling the controller whenever its
	pin is configured as input. Any better ideas for allowing
	userspace control the polling rate? Perhaps tap into ptp_poll()?

(2) ACPI IDs can't be shared at this moment, unfortunately.

(3) The change in arch/x86/kernel/tsc.c needs to be reviewed at length
	before going in.

Let me know what you guys think,
Cheers

Felipe Balbi (5):
  x86: tsc: add tsc to art helpers
  PTP: add a callback for counting timestamp events
  PTP: implement PTP_EVENT_COUNT_TSTAMP ioctl
  PTP: Add flag for non-periodic output
  PTP: Add support for Intel PMC Timed GPIO Controller

 arch/x86/include/asm/tsc.h        |   2 +
 arch/x86/kernel/tsc.c             |  32 +++
 drivers/ptp/Kconfig               |   8 +
 drivers/ptp/Makefile              |   1 +
 drivers/ptp/ptp-intel-pmc-tgpio.c | 378 ++++++++++++++++++++++++++++++
 drivers/ptp/ptp_chardev.c         |  15 ++
 include/linux/ptp_clock_kernel.h  |  12 +
 include/uapi/linux/ptp_clock.h    |   6 +-
 8 files changed, 453 insertions(+), 1 deletion(-)
 create mode 100644 drivers/ptp/ptp-intel-pmc-tgpio.c

-- 
2.22.0


             reply	other threads:[~2019-07-16  7:20 UTC|newest]

Thread overview: 32+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2019-07-16  7:20 Felipe Balbi [this message]
2019-07-16  7:20 ` [RFC PATCH 1/5] x86: tsc: add tsc to art helpers Felipe Balbi
2019-07-16  7:57   ` Thomas Gleixner
2019-08-15  5:57     ` Felipe Balbi
2019-08-15 14:16       ` Thomas Gleixner
2019-10-01 10:24         ` Felipe Balbi
2019-10-17 11:15           ` Thomas Gleixner
2019-10-17 12:01             ` Felipe Balbi
2019-07-16  7:20 ` [RFC PATCH 2/5] PTP: add a callback for counting timestamp events Felipe Balbi
2019-07-16  7:20 ` [RFC PATCH 3/5] PTP: implement PTP_EVENT_COUNT_TSTAMP ioctl Felipe Balbi
2019-07-16  7:20 ` [RFC PATCH 4/5] PTP: Add flag for non-periodic output Felipe Balbi
2019-07-16 16:39   ` Richard Cochran
2019-07-17  6:49     ` Felipe Balbi
2019-07-17 17:36       ` Richard Cochran
2019-07-18  8:59         ` Felipe Balbi
2019-07-18 16:41           ` Richard Cochran
2019-08-13  7:53             ` Felipe Balbi
2019-08-13 17:48               ` Richard Cochran
2019-08-13 18:06                 ` Richard Cochran
2019-08-14  7:05                   ` Felipe Balbi
2019-07-16  7:20 ` [RFC PATCH 5/5] PTP: Add support for Intel PMC Timed GPIO Controller Felipe Balbi
2019-07-16 19:14   ` Shannon Nelson
2019-07-17  6:51     ` Felipe Balbi
2019-07-16 16:41 ` [RFC PATCH 0/5] PTP: add support for Intel's TGPIO controller Richard Cochran
2019-07-17  6:52   ` Felipe Balbi
2019-07-17 17:39     ` Richard Cochran
2019-07-18  8:58       ` Felipe Balbi
2019-07-18 19:50 ` Andrew Lunn
2019-07-19  7:35   ` Felipe Balbi
2019-07-19 13:20     ` Andrew Lunn
2019-08-13  7:50       ` Felipe Balbi
2019-08-13 17:49         ` Richard Cochran

Reply instructions:

You may reply publicly to this message via plain-text email
using any one of the following methods:

* Save the following mbox file, import it into your mail client,
  and reply-to-all from there: mbox

  Avoid top-posting and favor interleaved quoting:
  https://en.wikipedia.org/wiki/Posting_style#Interleaved_style

* Reply using the --to, --cc, and --in-reply-to
  switches of git-send-email(1):

  git send-email \
    --in-reply-to=20190716072038.8408-1-felipe.balbi@linux.intel.com \
    --to=felipe.balbi@linux.intel.com \
    --cc=bp@alien8.de \
    --cc=christopher.s.hall@intel.com \
    --cc=hpa@zytor.com \
    --cc=linux-kernel@vger.kernel.org \
    --cc=mingo@redhat.com \
    --cc=netdev@vger.kernel.org \
    --cc=richardcochran@gmail.com \
    --cc=tglx@linutronix.de \
    --cc=x86@kernel.org \
    --subject='Re: [RFC PATCH 0/5] PTP: add support for Intel'\''s TGPIO controller' \
    /path/to/YOUR_REPLY

  https://kernel.org/pub/software/scm/git/docs/git-send-email.html

* If your mail client supports setting the In-Reply-To header
  via mailto: links, try the mailto: link

This is a public inbox, see mirroring instructions
for how to clone and mirror all data and code used for this inbox;
as well as URLs for NNTP newsgroup(s).