On 9/22/19 6:35 PM, William Breathitt Gray wrote:
On Thu, Sep 19, 2019 at 11:03:05AM +0300, Felipe Balbi wrote:
Add support for Intel PSE Quadrature Encoder
Signed-off-by: Felipe Balbi <felipe.balbi@xxxxxxxxxxxxxxx>
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Changes since v1:
- Many more private sysfs files converted over to counter interface
How do you want me to model this device's Capture Compare Mode (see
below)?
Hi Felipe,
I'm CCing Fabien and David as they may be interested in the timestamps
discussion. See below for some ideas I have on implementing this.
Could be an interesting read (thread from my first counter driver):
https://lore.kernel.org/linux-iio/1b913919-beb9-34e7-d915-6bcc40eeee1d@xxxxxxxxxxxxxx/
What would be useful to me is something like the buffer feature in iio
where a timestamp is associated with a count and stored in a buffer so that
we can look at a window of all values recorded in the last 20ms. Being able
to access this via mmap would be very helpful for performance (running on
300MHz ARM). Anything to do with timestamps in sysfs is probably not useful
unless it is a rare event, like a watchdog timeout.
