From: Andy Shevchenko <andriy.shevchenko@linux•intel.com>
To: lakshmi.sowjanya.d@intel•com
Cc: tglx@linutronix•de, jstultz@google•com, giometti@enneenne•com,
corbet@lwn•net, linux-kernel@vger•kernel.org, x86@kernel•org,
netdev@vger•kernel.org, linux-doc@vger•kernel.org,
intel-wired-lan@lists•osuosl.org, eddie.dong@intel•com,
christopher.s.hall@intel•com, jesse.brandeburg@intel•com,
davem@davemloft•net, alexandre.torgue@foss•st.com,
joabreu@synopsys•com, mcoquelin.stm32@gmail•com, perex@perex•cz,
linux-sound@vger•kernel.org, anthony.l.nguyen@intel•com,
pandith.n@intel•com, mallikarjunappa.sangannavar@intel•com,
thejesh.reddy.t.r@intel•com
Subject: Re: [RFC PATCH v2 08/10] pps: generators: Add PPS Generator TIO Driver
Date: Thu, 21 Dec 2023 18:26:14 +0200 [thread overview]
Message-ID: <ZYRnJlLJOYqlZSP0@smile.fi.intel.com> (raw)
In-Reply-To: <20231221093254.9599-9-lakshmi.sowjanya.d@intel.com>
On Thu, Dec 21, 2023 at 03:02:52PM +0530, lakshmi.sowjanya.d@intel•com wrote:
> From: Lakshmi Sowjanya D <lakshmi.sowjanya.d@intel•com>
>
> The Intel Timed IO PPS generator driver outputs a PPS signal using
> dedicated hardware that is more accurate than software actuated PPS.
> The Timed IO hardware generates output events using the ART timer.
> The ART timer period varies based on platform type, but is less than 100
> nanoseconds for all current platforms. Timed IO output accuracy is
> within 1 ART period.
>
> PPS output is enabled by writing '1' the 'enable' sysfs attribute. The
> driver uses hrtimers to schedule a wake-up 10 ms before each event
> (edge) target time. At wakeup, the driver converts the target time in
> terms of CLOCK_REALTIME to ART trigger time and writes this to the Timed
> IO hardware. The Timed IO hardware generates an event precisely at the
> requested system time without software involvement.
...
> +#include <linux/bits.h>
> +#include <linux/bitfield.h>
> +#include <linux/cleanup.h>
+ container_of.h
> +#include <linux/cpu.h>
+ device.h
+ err.h
+ hrtimer.h
> +#include <linux/io-64-nonatomic-hi-lo.h>
+ kstrtox.h
> +#include <linux/mod_devicetable.h>
> +#include <linux/module.h>
> +#include <linux/platform_device.h>
+ spinlock.h
+ sysfs.h
> +#include <linux/timekeeping.h>
> +#include <linux/types.h>
--
With Best Regards,
Andy Shevchenko
next prev parent reply other threads:[~2023-12-21 16:26 UTC|newest]
Thread overview: 15+ messages / expand[flat|nested] mbox.gz Atom feed top
2023-12-21 9:32 [RFC PATCH v2 00/10] Add support for Intel PPS Generator lakshmi.sowjanya.d
2023-12-21 9:32 ` [RFC PATCH v2 01/10] x86/tsc: Add base clock properties in clocksource structure lakshmi.sowjanya.d
2023-12-22 17:08 ` Vinicius Costa Gomes
2023-12-21 9:32 ` [RFC PATCH v2 02/10] timekeeping: Add function to convert realtime to base clock lakshmi.sowjanya.d
2023-12-21 9:32 ` [RFC PATCH v2 03/10] e10002: remove convert_art_to_tsc() lakshmi.sowjanya.d
2023-12-21 9:32 ` [RFC PATCH v2 04/10] igc: " lakshmi.sowjanya.d
2023-12-21 16:19 ` Andy Shevchenko
2023-12-21 9:32 ` [RFC PATCH v2 05/10] stmmac: intel: " lakshmi.sowjanya.d
2023-12-21 9:32 ` [RFC PATCH v2 06/10] ALSA: hda: " lakshmi.sowjanya.d
2023-12-21 9:32 ` [RFC PATCH v2 07/10] ice/ptp: " lakshmi.sowjanya.d
2023-12-21 9:32 ` [RFC PATCH v2 08/10] pps: generators: Add PPS Generator TIO Driver lakshmi.sowjanya.d
2023-12-21 16:26 ` Andy Shevchenko [this message]
2023-12-21 9:32 ` [RFC PATCH v2 09/10] Documentation: driver-api: pps: Add Intel Timed I/O PPS generator lakshmi.sowjanya.d
2023-12-21 9:32 ` [RFC PATCH v2 10/10] ABI: pps: Add ABI documentation for Intel TIO lakshmi.sowjanya.d
2023-12-21 16:27 ` Andy Shevchenko
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