[RFC PATCH v2 0/5] hw/misc: Add LED device

[Philippe Mathieu-Daudé]

Hello,

These patches are part of the GSoC unselected 'QEMU visualizer'
project.  As the AVR port is not merged, I switched to microbit
to keep working on it.

This series presents a proof of concept of LED device that can
be easily connected to a GPIO.
The LED emit QMP events, so an external visualizer can display
the LED events.

Since v1: addressed Eric Blake review comments
- Added QMP rate limit

This is stable enough to be used for the GSoC UI.

Next steps planned:

- integrate Zephyr test

- have a centralized container for all the machine's LEDs, to
track state changes in a single place and send less QMP events
(grouping changes, restricted to what actually changed).
[see to include keyboard LEDs].

- look at LED array/matrix such 7segments.

Regards,

Phil.

$ git backport-diff -u rfc-v1
Key:
[----] : patches are identical
[####] : number of functional differences between upstream/downstream patch
[down] : patch is downstream-only
The flags [FC] indicate (F)unctional and (C)ontextual differences, respectively

001/5:[0004] [FC] 'hw/misc: Add a LED device'
002/5:[0027] [FC] 'hw/misc/led: Add LED_STATUS_CHANGED QAPI event'
003/5:[----] [--] 'hw/misc/led: Add create_led_by_gpio_id() helper'
004/5:[----] [--] 'hw/arm/microbit: Add a fake LED to use as proof-of-concept 
with Zephyr'
005/5:[----] [--] 'hw/arm/tosa: Use LED device for the Bluetooth led'

Philippe Mathieu-Daudé (5):
  hw/misc: Add a LED device
  hw/misc/led: Add LED_STATUS_CHANGED QAPI event
  hw/misc/led: Add create_led_by_gpio_id() helper
  hw/arm/microbit: Add a fake LED to use as proof-of-concept with Zephyr
  hw/arm/tosa: Use LED device for the Bluetooth led

 qapi/led.json         |  47 ++++++++++++++++
 qapi/qapi-schema.json |   1 +
 include/hw/misc/led.h |  45 +++++++++++++++
 hw/arm/microbit.c     |   3 +
 hw/arm/tosa.c         |   7 +--
 hw/misc/led.c         | 126 ++++++++++++++++++++++++++++++++++++++++++
 MAINTAINERS           |   7 +++
 hw/arm/Kconfig        |   2 +
 hw/misc/Kconfig       |   3 +
 hw/misc/Makefile.objs |   1 +
 hw/misc/trace-events  |   3 +
 qapi/Makefile.objs    |   2 +-
 12 files changed, 242 insertions(+), 5 deletions(-)
 create mode 100644 qapi/led.json
 create mode 100644 include/hw/misc/led.h
 create mode 100644 hw/misc/led.c

-- 
2.21.3