linux-kernel - Re: [PATCH v4 0/2] iio: adc: add Nuvoton NCT7201 ADC driver

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Message-ID: <CA+4VgcJL7pi6y55N6QaUKNkOTqTKkF8dAo+5syvRCbx7gW+ehQ@mail.gmail.com>
Date: Mon, 7 Apr 2025 21:51:41 +0800
From: Yu-Hsian Yang <j2anfernee@...il.com>
To: Jonathan Cameron <jic23@...nel.org>
Cc: avifishman70@...il.com, tmaimon77@...il.com, tali.perry1@...il.com, 
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Subject: Re: [PATCH v4 0/2] iio: adc: add Nuvoton NCT7201 ADC driver

Dear Jonathan,

Thanks again for the review

Jonathan Cameron <jic23@...nel.org> 於 2025年2月22日 週六 下午11:25寫道：
>
> On Fri, 21 Feb 2025 17:09:16 +0800
> Eason Yang <j2anfernee@...il.com> wrote:
>
> Hi Eason,
>
> Not sure if I asked this before, but this is a device that seems
> to be typically used for hardware monitoring and there are a number
> of similar sounding device in drivers/hwmon/
>
> That raises a couple of questions:
> 1) Is it compatible with any of those existing drivers?

No, we need a new driver to do the ADC conversion for NCT7201/NCT7202.

> 2) Why IIO rather than HWMON?

A driver for NCT7201 with more functionality is available in the iio
adc subsystem.
If the chip is used for hardware monitoring, the iio->hwmon bridge
should be used.
>
> There isn't normally a problem with having a hardware monitoring
> related device supported by IIO, it is just good to know if your
> usecase makes that a good idea.  We have the iio-hwmon bridge
> driver to solve the problem of a device than can be used either
> as a generic ADC or as a hwmon type monitoring device (which tends
> to have more alarms etc)

Yes, we also verify the iio-hwmon bridge.

>
> Jonathan
>
>
> > Change since version 4:
> >  - Fix comments
> >  - Add interrupts and reset-gpios to the DT example
> >  - Use the FIELD_PREP and FIELD_GET
> >  - Add use_single_write in regmap_config
> >  - Use regmap_access_table
> >
> > Change since version 3:
> >  - Fix comments
> >  - Don't put nct720"x" in the name, just call it nct7201
> >  - Remove differential inputs until conversions are finished
> >  - Add NCT7201_ prefix in all macros and avoid the tables
> >  - Correct event threshold values in raw units
> >  - Add with and without interrupt callback function to have the event
> >    config part and one that doesn't
> >  - Remove print an error message if regmap_wirte failed case
> >
> > Change since version 2:
> >  - Remvoe read-vin-data-size property, default use read word vin data
> >  - Use regmap instead of i2c smbus API
> >  - IIO should be IIO_CHAN_INFO_RAW and _SCALE not _PROCESSED
> >  - Use dev_xxx_probe in probe function and dev_xxx in other functions
> >  - Use devm_iio_device_register replace of iio_device_register
> >  - Use guard(mutex) replace of mutex_lock
> >  - Use get_unaligned_le16 conversion API
> >
> > Changes since version 1:
> >  - Add new property in iio:adc binding document
> >  - Add new driver for Nuvoton NCT720x driver
> >
> > Eason Yang (2):
> >   dt-bindings: iio: adc: add NCT7201 ADCs
> >   iio: adc: add support for Nuvoton NCT7201
> >
> >  .../bindings/iio/adc/nuvoton,nct7201.yaml     |  57 ++
> >  MAINTAINERS                                   |   2 +
> >  drivers/iio/adc/Kconfig                       |  11 +
> >  drivers/iio/adc/Makefile                      |   1 +
> >  drivers/iio/adc/nct7201.c                     | 487 ++++++++++++++++++
> >  5 files changed, 558 insertions(+)
> >  create mode 100644 Documentation/devicetree/bindings/iio/adc/nuvoton,nct7201.yaml
> >  create mode 100644 drivers/iio/adc/nct7201.c
> >
>