Change the stepper API to instead of changing the stepper speed based on
the velocity in microsteps per second to use the delay in usec between
successive steps. Also remove the velocity from the `stepper_run` function
as typical API usage is enable -> set step interval -> run.
Signed-off-by: Fabian Blatz <fabianblatz@gmail.com>
Address issue where the timing source is not stopped upon step completion
and not adjusting the actual position after performing a step.
Signed-off-by: Fabian Blatz <fabianblatz@gmail.com>
Adds a fallback for the dual-edge-step property in the step dir common
code. Without this drivers using the common code would have to declare the
dual-edge-step property so it can default to false when not set, even if
the IC does not support adjusting it.
Signed-off-by: Fabian Blatz <fabianblatz@gmail.com>
Adds a timing source api which is used by the step-dir stepper common code.
This allows the reusable common code to configure different timing sources,
since the initial delayable work implementation was inacurate for higher
maximum velocities.
Signed-off-by: Fabian Blatz <fabianblatz@gmail.com>
