Re: [PATCH v3 0/5] Add support for PMBus in QEMU

[Corey Minyard]

On Tue, May 18, 2021 at 11:45:22AM -0700, Titus Rwantare wrote:
> Hello,
> 
> This patch series adds an interface to start supporting PMBus devices in QEMU.
> I’ve included two PMBus devices: MAX34451 and ADM1272.

I've reviewed all these patches, and beyond my one comment, they look
good.

I'm not too excited about putting the device files in misc.  I know some
SMBus sensors are in there, but they really aren't miscellaneous.  They
are really sensors.  But unless we want to create a sensors directory
and move things into that, misc will have to do, I guess.

-corey

> 
> 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 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 |  506 +++++++++++
>  hw/i2c/pmbus_device.c         | 1596 +++++++++++++++++++++++++++++++++
>  hw/misc/adm1272.c             |  543 +++++++++++
>  hw/misc/max34451.c            |  716 +++++++++++++++
>  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, 4162 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
> 
> -- 
> 2.31.1.751.gd2f1c929bd-goog
>