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Diffstat (limited to 'Documentation/ABI/testing/sysfs-tty')
| -rw-r--r-- | Documentation/ABI/testing/sysfs-tty | 9 |
1 files changed, 9 insertions, 0 deletions
diff --git a/Documentation/ABI/testing/sysfs-tty b/Documentation/ABI/testing/sysfs-tty index 9eb3c2b6b040..441105a75d1f 100644 --- a/Documentation/ABI/testing/sysfs-tty +++ b/Documentation/ABI/testing/sysfs-tty @@ -154,3 +154,12 @@ Description: device specification. For example, when user sets 7bytes on 16550A, which has 1/4/8/14 bytes trigger, the RX trigger is automatically changed to 4 bytes. + +What: /sys/class/tty/ttyS0/pps_4wire +Date: September 2018 +Contact: Steve Sakoman <steve@sakoman.com> +Description: + Shows/sets "4 wire" mode for the PPS input to the serial driver. + For fully implemented serial ports PPS is normally provided + on the DCD line. For partial "4 wire" implementations CTS is + used instead of DCD. |