On Fri, 17 Jun 2022 10:03:30 -0400 William Breathitt Gray <william.gray@xxxxxxxxxx> wrote: > On Fri, Jun 17, 2022 at 06:37:14AM +0000, N, Pandith wrote: > > Hi, > > > > We have a Intel Timed IO peripheral with following functionalities : > > > > 1. Event capture capability - Captures event count and timestamp. > > 2. Pulse generation - periodic or single event generation. > > 3. Return cross-timestamp on request. > > > > Timed IO device is being used in various Industrial use cases such as : time capture, synchronization, fan speed calculation etc. > > > > IIO or counter subsystem seems to be suitable for timed-io driver. > > > > Is it favourable to implement as part of IIO or counter subsystem ? Wanted to know your feedback. > > > > We may need to use custom ABI for sysfs based user interaction OR > > Can we enhance ioctl interface to accommodate our use case (counter-chardev.c) ? > > Since timed-io works in nano second precision, ioctl is more suitable. > > > > Regards, > > Pandith and Sowjanya > > > > ps : resent the mail with plain text as delivery to linux-iio@xxxxxxxxxxxxxxx failed. > > Hello Pandith and Sowjanya, > > What you are describing sounds similar to what counter-chardev.c tries > to solve (i.e. Counter events with timestamps). Would you elaborate more > on how this device works and what you are trying to accomplish with it? > > For example, when you refer to an "event count and timestamp", does > count here mean the internal device hardware timestamp or is this the > Linux system timestamp? Does "pulse generation" refer to capturing the > count on some physical line signal, or is this a device-internal timer > countdown trigger event? Is "cross-timestamp" referring to a difference > calculation between two count events? > > Thanks, > > William Breathitt Gray > If there is any chance of some docs access it might cut down people trying to interpret what "Captures event count and timestamp" means! :) That could be read as encoder type cases or it could be read as single event capture. As you've discovered, the boundaries can get rather blurred! Jonathan
