linux-toradex.git/drivers/ptp/ptp_clock.c, branch v4.10

ptp: Introduce a high resolution frequency adjustment method.

2016-11-10T02:19:53+00:00

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 
Suggested-by: Ulrik De Bie 
Signed-off-by: David S. Miller

ptp: Fix resource leak in case of error

2016-10-04T01:54:10+00:00

A call to 'ida_simple_remove()' is missing in the error handling path.

This as been spotted with the following coccinelle script which tries to
detect missing 'ida_simple_remove()' call in error handling paths.

///////////////
@@
expression x;
identifier l;
@@

*   x = ida_simple_get(...);
    ...
    if (...) {
    ...
    }
    ...
    if (...) {
       ...
       goto l;
    }
    ...
*   l: ... when != ida_simple_remove(...);

Signed-off-by: Christophe JAILLET 
Acked-by: Richard Cochran 
Signed-off-by: David S. Miller

ptp: remove 32 bit get/set methods.

2015-03-31T16:01:19+00:00

All of the PHC drivers have been converted to the new methods.  This patch
converts the three remaining callers within the core code and removes the
older methods for good.  As a result, the core PHC code is ready for the
year 2038.  However, some of the PHC drivers are not quite ready yet.

Signed-off-by: Richard Cochran 
Signed-off-by: David S. Miller

ptp: use the 64 bit get/set time methods for the posix clock.

2015-03-31T16:01:16+00:00

This patch changes the posix clock code to prefer the new methods
whenever they are implemented by the PHC drivers.

Signed-off-by: Richard Cochran 
Signed-off-by: David S. Miller

ptp: validate the requested frequency adjustment.

2014-04-28T17:28:43+00:00

PTP Hardware Clock drivers specify a maximum frequency adjustment that
their clocks can accommodate. Normally, user space programs will want to
respect the advertised limits. However, no kernel or driver code checks
that the dialed frequency offset is within the bounds, and out of range
values can lead to surprising results.

This patch fixes the issue by rejecting bad values.

Signed-off-by: Richard Cochran 
Signed-off-by: David S. Miller

ptp: introduce programmable pins.

2014-03-21T18:21:13+00:00

This patch adds a pair of new ioctls to the PTP Hardware Clock device
interface. Using the ioctls, user space programs can query each pin to
find out its current function and also reprogram a different function
if desired.

Signed-off-by: Richard Cochran 
Signed-off-by: David S. Miller

PTP: convert class code to use dev_groups

2013-07-27T01:05:17+00:00

The dev_attrs field of struct class is going away soon, dev_groups
should be used instead.  This converts the ptp class code to use the
correct field.

Acked-by: Richard Cochran 
Signed-off-by: Greg Kroah-Hartman

ptp: dynamic allocation of PHC char devices

2013-04-12T22:22:45+00:00

As network adapters supporting PTP are becoming more common, machines with
many NICs suddenly have many PHCs, too. The current limit of eight /dev/ptp*
char devices (and thus, 8 network interfaces with PHC) is insufficient. Let
the ptp driver allocate the char devices dynamically.

Tested with 28 PHCs, removing and re-adding some of them.

Thanks to Ben Hutchings for advice leading to simpler and cleaner patch.

Signed-off-by: Jiri Benc 
Acked-by: Richard Cochran 
Signed-off-by: David S. Miller

ptp: link the phc device to its parent device

2012-09-22T19:42:38+00:00

PTP Hardware Clock devices appear as class devices in sysfs. This patch
changes the registration API to use the parent device, clarifying the
clock's relationship to the underlying device.

Signed-off-by: Richard Cochran 
Acked-by: Ben Hutchings 
Acked-by: Jeff Kirsher 
Signed-off-by: David S. Miller

ptp: provide the clock's adjusted frequency

2012-09-22T19:42:08+00:00

If the timex.mode field indicates a query, then we provide the value of
the current frequency adjustment.

[ Get rid of extraneous empty lines -DaveM ]

Signed-off-by: Richard Cochran 
Signed-off-by: David S. Miller