linux-kernel - [PATCH 0/8] counter: ti-eqep: implement features for speed measurement

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Message-Id: <20211017013343.3385923-1-david@lechnology.com>
Date:   Sat, 16 Oct 2021 20:33:35 -0500
From:   David Lechner <david@...hnology.com>
To:     linux-iio@...r.kernel.org
Cc:     David Lechner <david@...hnology.com>,
        William Breathitt Gray <vilhelm.gray@...il.com>,
        Robert Nelson <robertcnelson@...il.com>,
        linux-kernel@...r.kernel.org
Subject: [PATCH 0/8] counter: ti-eqep: implement features for speed measurement

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