[PATCH v5 0/5] Add support for PMBus in QEMU

[Titus Rwantare <titusr@google.com>]

Hello,

This patch series adds an interface to start supporting PMBus devices in QEMU.
I’ve included two PMBus devices: MAX34451 and ADM1272.

PMBus is a variant of SMBus meant for digital management of power supplies.
PMBus adds to the SMBus standard by defining a number of constants and commands
used by compliant devices. The specification for PMBus can be found at:

https://pmbus.org/specification-archives/

Currently, the goal for these devices is to emulate basic functionality by
reading and writing registers. Timing, and some logical operation is not
implemented. This implementation supports nearly all available registers for
PMBus including:
   - Voltage inputs and outputs
   - Current inputs and outputs
   - Temperature sensors

Unimplimented registers get passed through to the device model, and device
models can opt out of using the standard registers with flags. The included
devices make use of these fields and illustrate how to interface with the pmbus
class.

Datasheets for sensors:

https://datasheets.maximintegrated.com/en/ds/MAX34451.pdf
https://www.analog.com/media/en/technical-documentation/data-sheets/ADM1272.pdf

Since v4:
- switched to BIT_ULL for flags to enable 32 bit hosts

Since v3:
- added VMState descriptions. Adding PMBusPage info to the vmsd has proven to be tricky, it's a TODO for now.

Since v2:
- bump for feedback
- removed commented out code

Since v1:
- addressed Joel's comments
- split out tests into their own patches

Thanks for reviewing,

Titus Rwantare

Titus Rwantare (5):
  hw/i2c: add support for PMBus
  hw/misc: add ADM1272 device
  tests/qtest: add tests for ADM1272 device model
  hw/misc: add MAX34451 device
  tests/qtest: add tests for MAX34451 device model

 include/hw/i2c/pmbus_device.h |  517 +++++++++++
 hw/i2c/pmbus_device.c         | 1612 +++++++++++++++++++++++++++++++++
 hw/misc/adm1272.c             |  544 +++++++++++
 hw/misc/max34451.c            |  775 ++++++++++++++++
 tests/qtest/adm1272-test.c    |  445 +++++++++
 tests/qtest/max34451-test.c   |  336 +++++++
 hw/arm/Kconfig                |    3 +
 hw/i2c/Kconfig                |    4 +
 hw/i2c/meson.build            |    1 +
 hw/misc/Kconfig               |    8 +
 hw/misc/meson.build           |    2 +
 tests/qtest/meson.build       |    2 +
 12 files changed, 4249 insertions(+)
 create mode 100644 include/hw/i2c/pmbus_device.h
 create mode 100644 hw/i2c/pmbus_device.c
 create mode 100644 hw/misc/adm1272.c
 create mode 100644 hw/misc/max34451.c
 create mode 100644 tests/qtest/adm1272-test.c
 create mode 100644 tests/qtest/max34451-test.c

-- 
2.32.0.93.g670b81a890-goog