diff options
Diffstat (limited to 'include/linux/firewire-cdev.h')
| -rw-r--r-- | include/linux/firewire-cdev.h | 5 |
1 files changed, 4 insertions, 1 deletions
diff --git a/include/linux/firewire-cdev.h b/include/linux/firewire-cdev.h index b8740916079..da0fec7e8dc 100644 --- a/include/linux/firewire-cdev.h +++ b/include/linux/firewire-cdev.h @@ -294,7 +294,10 @@ struct fw_cdev_event_iso_resource { * @length: Data length in bytes * @data: Incoming data * - * If @type is %FW_CDEV_EVENT_PHY_PACKET_SENT, @length is 0 and @data empty. + * If @type is %FW_CDEV_EVENT_PHY_PACKET_SENT, @length is 0 and @data empty, + * except in case of a ping packet: Then, @length is 4, and @data[0] is the + * ping time in 49.152MHz clocks if @rcode is %RCODE_COMPLETE. + * * If @type is %FW_CDEV_EVENT_PHY_PACKET_RECEIVED, @length is 8 and @data * consists of the two PHY packet quadlets, in host byte order. */ |