From: Richard Cochran <richardcochran@gmail.com>
To: christopher.s.hall@intel.com
Cc: netdev@vger.kernel.org, linux-kernel@vger.kernel.org,
tglx@linutronix.de, hpa@zytor.com, mingo@redhat.com,
x86@kernel.org, jacob.e.keller@intel.com, davem@davemloft.net,
sean.v.kelley@intel.com
Subject: Re: [Intel PMC TGPIO Driver 0/5] Add support for Intel PMC Time GPIO Driver with PHC interface changes to support additional H/W Features
Date: Sun, 2 Feb 2020 20:08:38 -0800 [thread overview]
Message-ID: <20200203040838.GA5851@localhost> (raw)
In-Reply-To: <20191211214852.26317-1-christopher.s.hall@intel.com>
On Wed, Dec 11, 2019 at 01:48:47PM -0800, christopher.s.hall@intel.com wrote:
> The ART frequency is not adjustable. In order, to implement output
> adjustments an additional edge-timestamp API is added, as well, as
> a periodic output frequency adjustment API. Togther, these implement
> equivalent functionality to the existing SYS_OFFSET_* and frequency
> adjustment APIs.
I don't see a reason for a custom, new API just for this device.
The TGPIO input clock, the ART, is a free running counter, but you
want to support frequency adjustments. Use a timecounter cyclecounter
pair.
Let the user dial a periodic output signal in the normal way.
Let the user change the frequency in the normal way, and during this
call, adjust the counter values accordingly.
Thanks,
Richard
next prev parent reply other threads:[~2020-02-03 4:08 UTC|newest]
Thread overview: 36+ messages / expand[flat|nested] mbox.gz Atom feed top
2019-12-11 21:48 [Intel PMC TGPIO Driver 0/5] Add support for Intel PMC Time GPIO Driver with PHC interface changes to support additional H/W Features christopher.s.hall
2019-12-11 21:48 ` [Intel PMC TGPIO Driver 1/5] drivers/ptp: Add Enhanced handling of reserve fields christopher.s.hall
2020-01-31 16:54 ` Jacob Keller
2020-02-03 1:45 ` Richard Cochran
2020-02-24 23:29 ` Christopher S. Hall
2020-01-31 17:02 ` Jacob Keller
2020-02-03 1:27 ` Richard Cochran
2020-02-24 23:23 ` Christopher S. Hall
2019-12-11 21:48 ` [Intel PMC TGPIO Driver 2/5] drivers/ptp: Add PEROUT2 ioctl frequency adjustment interface christopher.s.hall
2020-02-03 2:14 ` Richard Cochran
2020-02-26 0:20 ` Christopher S. Hall
2019-12-11 21:48 ` [Intel PMC TGPIO Driver 3/5] drivers/ptp: Add user-space input polling interface christopher.s.hall
2020-02-03 2:28 ` Richard Cochran
2019-12-11 21:48 ` [Intel PMC TGPIO Driver 4/5] x86/tsc: Add TSC support functions to support ART driven Time-Aware GPIO christopher.s.hall
2019-12-11 21:48 ` [Intel PMC TGPIO Driver 5/5] drivers/ptp: Add PMC Time-Aware GPIO Driver christopher.s.hall
2020-02-03 2:31 ` Richard Cochran
2020-02-07 17:10 ` Linus Walleij
2020-02-07 17:28 ` Andrew Lunn
2020-02-07 19:49 ` Andy Shevchenko
2020-02-07 19:52 ` Andy Shevchenko
2020-02-24 23:17 ` Christopher S. Hall
2020-01-31 15:08 ` [Intel PMC TGPIO Driver 0/5] Add support for Intel PMC Time GPIO Driver with PHC interface changes to support additional H/W Features Jakub Kicinski
2020-01-31 18:14 ` Thomas Gleixner
2020-02-24 22:40 ` Christopher S. Hall
2020-02-26 23:06 ` Thomas Gleixner
2020-03-03 1:56 ` Christopher S. Hall
2020-03-03 13:00 ` Linus Walleij
2020-03-03 15:23 ` Richard Cochran
2020-03-03 15:24 ` Thomas Gleixner
2020-03-08 19:14 ` Jonathan Cameron
2020-02-03 4:08 ` Richard Cochran [this message]
2020-02-03 18:27 ` Jacob Keller
2020-02-25 23:37 ` Christopher S. Hall
2020-02-26 2:47 ` Richard Cochran
2020-03-03 2:01 ` Christopher S. Hall
2020-02-07 17:17 ` Linus Walleij
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