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[v8,0/6] hwmon: pmbus: adm1266: add support

Message ID 20200812142055.9213-1-alexandru.tachici@analog.com
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Series hwmon: pmbus: adm1266: add support | expand

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Alexandru Tachici Aug. 12, 2020, 2:20 p.m. UTC 
From: Alexandru Tachici <alexandru.tachici@analog.com>

Add PMBus probing driver for the adm1266 Cascadable
Super Sequencer with Margin Control and Fault Recording.
Driver is using the pmbus_core, creating sysfs files
under hwmon for inputs: vh1->vh4 and vp1->vp13.

1. Add PMBus probing driver for inputs vh1->vh4
and vp1->vp13.

2. Add Block Write-Read Process Call command.
A PMBus specific implementation was required because
block write with I2C_SMBUS_PROC_CALL flag allows a
maximum of 32 bytes to be received.

3. This makes adm1266 driver expose GPIOs
to user-space. Currently are read only. Future
developments on the firmware will allow
them to be writable.

4. Allow the current sate of the sequencer to be read
through debugfs.

5. Blackboxes are 64 bytes of chip state related data
that is generated on faults. Use the nvmem kernel api
to expose the blackbox chip functionality to userspace.

6. DT bindings for ADM1266.

Alexandru Tachici (6):
  hwmon: pmbus: adm1266: add support
  hwmon: pmbus: adm1266: Add Block process call
  hwmon: pmbus: adm1266: Add support for GPIOs
  hwmon: pmbus: adm1266: add debugfs for states
  hwmon: pmbus: adm1266: read blackbox
  dt-bindings: hwmon: Add bindings for ADM1266

Changelog v7 -> v8:
  - removed firmware/config programming
  - in adm1266_pmbus_block_xfer unlock buf mutex on error paths
  - added "depends on GPIOLIB" in kconfig ("select GPIOLIB" triggers a
  recursive dependency error)
  - removed cell access check (only blackbox cell will be used)
  - removed #if IS_ENABLED(CONFIG_NVMEM)
  - dt-bindings: removed adi,master-adm1266 property

 .../bindings/hwmon/adi,adm1266.yaml           |  51 ++
 Documentation/hwmon/adm1266.rst               |  37 ++
 Documentation/hwmon/index.rst                 |   1 +
 drivers/hwmon/pmbus/Kconfig                   |  11 +
 drivers/hwmon/pmbus/Makefile                  |   1 +
 drivers/hwmon/pmbus/adm1266.c                 | 513 ++++++++++++++++++
 6 files changed, 614 insertions(+)
 create mode 100644 Documentation/devicetree/bindings/hwmon/adi,adm1266.yaml
 create mode 100644 Documentation/hwmon/adm1266.rst
 create mode 100644 drivers/hwmon/pmbus/adm1266.c