Richard Cochran d8d2635419 ptp: Introduce a high resolution frequency adjustment method. ... The internal PTP Hardware Clock (PHC) interface limits the resolution for frequency adjustments to one part per billion. However, some hardware devices allow finer adjustment, and making use of the increased resolution improves synchronization measurably on such devices. This patch adds an alternative method that allows finer frequency tuning by passing the scaled ppm value to PHC drivers. This value comes from user space, and it has a resolution of about 0.015 ppb. We also deprecate the older method, anticipating its removal once existing drivers have been converted over. Signed-off-by: Richard Cochran <richardcochran@gmail.com> Suggested-by: Ulrik De Bie <ulrik.debie-os@e2big.org> Signed-off-by: David S. Miller <davem@davemloft.net>		2016-11-09 21:19:53 -05:00
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Kconfig	ptp: ptp_pch depends on x86_32	2014-06-17 15:43:48 -07:00
Makefile	supports eg20t ptp clock	2012-03-09 13:55:34 -08:00
ptp_chardev.c	drivers/ptp: Fix kernel memory disclosure	2016-10-13 10:20:06 -04:00
ptp_clock.c	ptp: Introduce a high resolution frequency adjustment method.	2016-11-09 21:19:53 -05:00
ptp_ixp46x.c	ptp: ixp46x: remove NO_IRQ handling	2016-09-06 16:57:02 -07:00
ptp_pch.c	ptp: pch: convert to the 64 bit get/set time methods.	2015-03-31 12:01:19 -04:00
ptp_private.h	ptp: expose the programmable pins via sysfs	2014-03-21 14:21:14 -04:00
ptp_sysfs.c	ptp: use permission-specific DEVICE_ATTR variants	2016-10-31 15:32:12 -04:00