ptp: expose the programmable pins via sysfs

[firefly-linux-kernel-4.4.55.git] / Documentation / ABI / testing / sysfs-ptp

diff --git a/Documentation/ABI/testing/sysfs-ptp b/Documentation/ABI/testing/sysfs-ptp
index 05aeedf177946a9f9eb99a9f6b4b26a488f2f74a..44806a678f12a21a3ff149bc1b7838a4c14da602 100644 (file)
--- a/Documentation/ABI/testing/sysfs-ptp
+++ b/Documentation/ABI/testing/sysfs-ptp
@@ -54,6 +54,26 @@ Description:
                This file contains the number of programmable periodic
                output channels offered by the PTP hardware clock.
 
+What:          /sys/class/ptp/ptpN/n_pins
+Date:          March 2014
+Contact:       Richard Cochran <richardcochran@gmail.com>
+Description:
+               This file contains the number of programmable pins
+               offered by the PTP hardware clock.
+
+What:          /sys/class/ptp/ptpN/pins
+Date:          March 2014
+Contact:       Richard Cochran <richardcochran@gmail.com>
+Description:
+               This directory contains one file for each programmable
+               pin offered by the PTP hardware clock. The file name
+               is the hardware dependent pin name. Reading from this
+               file produces two numbers, the assigned function (see
+               the PTP_PF_ enumeration values in linux/ptp_clock.h)
+               and the channel number. The function and channel
+               assignment may be changed by two writing numbers into
+               the file.
+
 What:          /sys/class/ptp/ptpN/pps_avaiable
 Date:          September 2010
 Contact:       Richard Cochran <richardcochran@gmail.com>