Now that the counter subsystem has a new chrdev for events, we can use this to add new features to the TI eQEP driver to be able to do accurate speed measurement. This adds two new device-level components, a Unit Timer and an Edge Capture Unit. I don't have much knowledge about other available counter hardware, so I don't know if it makes sense to try to make these more generic, e.g. counterX/timerY/* and counterX/captureY/*. For now, they are just flat (counterX/unit_timer_* and counterX/edge_capture_unit_*) and assume there is only one instance per counter device. This has been tested on a BeagleBone Blue with LEGO MINDSTORMS motors. David Lechner (8): counter/ti-eqep: implement over/underflow events counter/ti-eqep: add support for direction counter/ti-eqep: add support for unit timer docs: counter: add unit timer sysfs attributes counter/ti-eqep: add support for latched position docs: counter: add latch_mode and latched_count sysfs attributes counter/ti-eqep: add support for edge capture unit docs: counter: add edge_capture_unit_* attributes Documentation/ABI/testing/sysfs-bus-counter | 100 +++- drivers/counter/ti-eqep.c | 482 +++++++++++++++++++- include/uapi/linux/counter.h | 4 + 3 files changed, 575 insertions(+), 11 deletions(-) -- 2.25.1
