[v5,0/4] Add Ampere's Altra SMPro hwmon driver

Message

Quan Nguyen July 13, 2021, 6 a.m. UTC

This patch series adds support for Ampere SMpro hwmon driver. This
driver supports accessing various CPU sensors provided by the SMpro
co-processor including temperature, power, voltages, and current found
on Ampere Altra processor family.

The SMpro co-processor on Ampere Altra processor family is to monitor
and report various data included hwmon-related info, RAS errors, and
other miscellaneous information. The SMPro MFD driver intializes the
register map and instantiates all sub-devices. All the specifics will
be handled in the child drivers.

v5:
  + Introduced the smpro-mfd driver and drop the use of
  simple-mfd-i2c driver to avoid DT node with no resource in child
  device DT nodes [Rob]
  + Removed the use of reg DT property in child driver [Quan]
  + Validated ManufactureID when probing smpro-mfd drivers [Quan]
  + As child devices are instantiated by SMPro MFD driver, drop the
  ManufacturerID checking in child driver, ie: smpro-hwmon [Quan]
  + Revised commit messages [Quan]

v4:
  + Revised commit message [Quan]
  + Fixed build issue found by kernel test robot [Guenter]
  + Returned regmap_read() error code [Guenter]

v3:
  + Supported list of compatible string [Rob]
  + Introduced reg property in DT to specify reg offset [Rob]
  + Updated description and other minor changes in yaml file [Rob]
  + Handled negative temperature value [Guenter]
  + Returned -ENODEV if Manufacturer ID is wrong [Guenter]
  + Refactored smpro_read_string() and smpro_temp_read() [Guenter]
  + Removed smpro_write() function [Guenter]
  + Added minor refactor changes [Quan]

v2:
  + Used 'struct of_device_id's .data attribute [Lee Jones]
  + Removed "virtual" sensors [Guenter]
  + Fixed typo "mili" to "milli", "nanoWatt" to "microWatt" [Guenter]
  + Reported SOC_TDP as "Socket TDP" using max attributes [Guenter]
  + Clarified "highest" meaning in documentation [Guenter]
  + Corrected return error code when host is turn off [Guenter]
  + Reported MEM HOT Threshold for all DIMMs as temp*_crit [Guenter]
  + Removed license info as SPDX-License-Identifier existed [Guenter]
  + Added is_visible() support [Guenter]
  + Used HWMON_CHANNEL_INFO() macro and LABEL attributes [Guenter]
  + Made is_valid_id() return boolean [Guenter]
  + Returned -EPROBE_DEFER when smpro reg inaccessible [Guenter]
  + Removed unnecessary error message when dev register fail [Guenter]
  + Removed Socket TDP sensor [Quan]
  + Changed "ampere,ac01-smpro" to "ampere,smpro" [Quan]
  + Included sensor type and channel in labels [Quan]
  + Refactorized code to fix checkpatch.pl --strict complaint [Quan]

Quan Nguyen (4):
  dt-bindings: mfd: Add bindings for Ampere Altra SMPro MFD driver
  mfd: smpro-mfd: Adds Ampere's Altra SMpro MFD driver
  hwmon: smpro: Add Ampere's Altra smpro-hwmon driver
  docs: hwmon: (smpro-hwmon) Add documentation

 .../devicetree/bindings/mfd/ampere,smpro.yaml |  52 ++
 Documentation/hwmon/index.rst                 |   1 +
 Documentation/hwmon/smpro-hwmon.rst           | 101 ++++
 drivers/hwmon/Kconfig                         |   8 +
 drivers/hwmon/Makefile                        |   1 +
 drivers/hwmon/smpro-hwmon.c                   | 463 ++++++++++++++++++
 drivers/mfd/Kconfig                           |  12 +
 drivers/mfd/Makefile                          |   1 +
 drivers/mfd/smpro-mfd.c                       |  74 +++
 9 files changed, 713 insertions(+)
 create mode 100644 Documentation/devicetree/bindings/mfd/ampere,smpro.yaml
 create mode 100644 Documentation/hwmon/smpro-hwmon.rst
 create mode 100644 drivers/hwmon/smpro-hwmon.c
 create mode 100644 drivers/mfd/smpro-mfd.c