[PATCH v2 0/2] add support for Microchip PAC1711 Power Monitor

[Ariana Lazar <ariana.lazar@microchip.com>]

The PAC1711, PAC1721, PAC1811 and PAC1821 products are single-channel power
monitors with accumulator. The PAC1711 and PAC1721 devices use 12-bit
resolution for voltage and current measurements and 24 bits for power
calculations, while PAC1811 and PAC1821 have 16-bit resolution and use 32
bits for power calculations. The 56-bit accumulator register accumulates
power (energy) or current (Coulomb counter).

PAC1711 and PAC1811 measure up to 42V Full-Scale Range, respectively 9V for
PAC1721 and PAC1821.

Signed-off-by: Ariana Lazar <ariana.lazar@microchip.com>
---
Changes in v2:
- fix review comments device tree binding:
    add PAC1721, PAC1811 and PAC1821 part numbers
    add Vbus/Vsense input ranges in attribute definition
    change accumulation-mode from int to string type
    remove size and address cells
    correct interrupts definition and add attributes for the two
      alerts, microchip,gpio0-mode and microchip,gpio1-mode
    remove microchip,gpio attribute
    remove "vbus" accumulation mode 

- fix review comments driver:
    add PAC1721, PAC1811 and PAC1821 part numbers
    run pahole on reg_data and pac1711_chip_info structs
    remove average registers - VBUS_AVG and VSENSE_AVG
    add PAC1721, PAC1811, PAC1821 to features/compatible
    add missing headers
    remove rarely used defines like PAC1711_POWER_24B_RES and use the
      numerical value inline instead
    use ARRAY_SIZE() instead of define for the number of accumulator
      related attributes
    add explanation for bytes length defines
    use spacing convention space after { and before }
    remove pac1711_shift_map_tbl in order to use just
      pac1711_samp_rate_map_tbl and an index saved in struct
    use read_avail() for sampling_rate
    change mutex comment in reg_data
    use fsleep instead of usleep
    use a local __be16 variable in endianess transformations
    add missing error returns after dev_err
    add info_mask_shared_by_all for sampling_frequency 
    use dev_info instead of dev_err_probe in chip_identify
    generalize input setup functions into one
    remove device_property_present
    rename pac1711_single_channel into pac1711_chan_spec
    rename pac1711_of_parse_channel_config into pac1711_parse_fw
    remove unneccessary comments in probe
    define in_shunt_resistor as ext_info instead of custom attribute
    use calculations only with 16-bit resolution instead of multiple
     shifting (12-bit registers are left shifted)
    add scale computations based on new voltage of 9V for PAC1721/PAC1821

v1:
- first version committed to review
- Link to v1: https://lore.kernel.org/r/20251015-pac1711-v1-0-976949e36367@microchip.com

---
Ariana Lazar (2):
      dt-bindings: iio: adc: add support for PAC1711
      iio: adc: add support for PAC1711

 .../ABI/testing/sysfs-bus-iio-adc-pac1711          |   24 +
 .../bindings/iio/adc/microchip,pac1711.yaml        |  209 ++++
 MAINTAINERS                                        |    8 +
 drivers/iio/adc/Kconfig                            |   11 +
 drivers/iio/adc/Makefile                           |    1 +
 drivers/iio/adc/pac1711.c                          | 1274 ++++++++++++++++++++
 6 files changed, 1527 insertions(+)
---
base-commit: 19272b37aa4f83ca52bdf9c16d5d81bdd1354494
change-id: 20250901-pac1711-d3bacda400fd

Best regards,
-- 
Ariana Lazar <ariana.lazar@microchip.com>