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

On Tue, 28 Jul 2026 15:03:47 +0300
Ariana Lazar <[email protected]> wrote:

> 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 <[email protected]>
Make sure to check https://sashiko.dev/#/patchset/20260728-pac1711-v2-0-609bc026093c%40microchip.com
but keep in mind it is far from always correct so treat every comment
as a strong hint their maybe something going on rather than anything certain!

It invents IIO_CHARGE as a channel type for instance :)

> ---
> 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/[email protected]
> 
> ---
> 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,