diff options
| author | Richard Cochran <richardcochran@gmail.com> | 2012-09-22 11:02:04 +0400 |
|---|---|---|
| committer | David S. Miller <davem@davemloft.net> | 2012-09-22 23:42:46 +0400 |
| commit | de46584675fad02b7f8255f31be0ea1be5cd185b (patch) | |
| tree | 45fe54d42a38c2f1293fc6137f2f1ebae62ef88e | |
| parent | 1ef761582c074448bae5be97abde5934667e7710 (diff) | |
| download | linux-de46584675fad02b7f8255f31be0ea1be5cd185b.tar.xz | |
ptp: clarify the clock_name sysfs attribute
There has been some confusion among PHC driver authors about the
intended purpose of the clock_name attribute. This patch expands the
documation in order to clarify how the clock_name field should be
understood.
Signed-off-by: Richard Cochran <richardcochran@gmail.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
| -rw-r--r-- | Documentation/ABI/testing/sysfs-ptp | 6 | ||||
| -rw-r--r-- | include/linux/ptp_clock_kernel.h | 4 |
2 files changed, 8 insertions, 2 deletions
diff --git a/Documentation/ABI/testing/sysfs-ptp b/Documentation/ABI/testing/sysfs-ptp index d40d2b550502..05aeedf17794 100644 --- a/Documentation/ABI/testing/sysfs-ptp +++ b/Documentation/ABI/testing/sysfs-ptp @@ -19,7 +19,11 @@ Date: September 2010 Contact: Richard Cochran <richardcochran@gmail.com> Description: This file contains the name of the PTP hardware clock - as a human readable string. + as a human readable string. The purpose of this + attribute is to provide the user with a "friendly + name" and to help distinguish PHY based devices from + MAC based ones. The string does not necessarily have + to be any kind of unique id. What: /sys/class/ptp/ptpN/max_adjustment Date: September 2010 diff --git a/include/linux/ptp_clock_kernel.h b/include/linux/ptp_clock_kernel.h index 56c71b27112e..f2dc6d8fc680 100644 --- a/include/linux/ptp_clock_kernel.h +++ b/include/linux/ptp_clock_kernel.h @@ -42,7 +42,9 @@ struct ptp_clock_request { * struct ptp_clock_info - decribes a PTP hardware clock * * @owner: The clock driver should set to THIS_MODULE. - * @name: A short name to identify the clock. + * @name: A short "friendly name" to identify the clock and to + * help distinguish PHY based devices from MAC based ones. + * The string is not meant to be a unique id. * @max_adj: The maximum possible frequency adjustment, in parts per billon. * @n_alarm: The number of programmable alarms. * @n_ext_ts: The number of external time stamp channels. |