Hello!
This series adds driver and documentation for Maxim max9611/max9612
high-side current sense amplifier with 12-bit ADC and I2c interface.
It also registers two devices installed on VDD_0.8V and DVFS_0.8V lines
in Renesas r87796 Salvator-X board.
The device provides several functionalities, and only some of them are
currently supported by this driver.
Particularly, the on-board op-amp and analog comparator are not currently
supported.
A simplified integration schematic drawing is here reported:
----o----/\/\/-----o-------|LOAD|---
| shunt |
____|______________|___
| RS+ RS- |
| |-----gain-----| |
| | |
| | |
|max961x |->| ADC |===== I2c
|______________________|
The device provides though its 12-bits ADC the following informations:
- Common input voltage on RS+
- Voltage drop between RS+ and RS- ends
- Die temperature
All of the above ones are exposed though IIO with _raw and _scale values
(plus _input for milli degree Celsius die temperature).
>From the above values the driver calculates the current flowing between
RS+ and RS- ends, using the shunt resistor value provided by device tree, and
the power load. Again this values are exposed through _raw and _scale
attributes, which I'm not completely sure it's acceptables as they are
calculated values and not natively provided by the current sense amplifier.
I would like to hear IIO people opinions on this, if they should be better
exposed though some other attributes which are not _raw and _scale, or if
their calculation should be completely left to userspace tools.
Thanks
j
Jacopo Mondi (4):
Documentation: dt-bindings: iio: Add max961x
iio: Documentation: Add max961x sysfs documentation
iio: adc: Add max9611/9612 ADC driver
arm64: dts: salvator-x: Add current sense amplifiers
.../ABI/testing/sysfs-bus-iio-adc-max961x | 5 +
.../devicetree/bindings/iio/adc/max961x.txt | 27 +
arch/arm64/boot/dts/renesas/r8a7796-salvator-x.dts | 17 +
drivers/iio/adc/Kconfig | 10 +
drivers/iio/adc/Makefile | 1 +
drivers/iio/adc/max961x.c | 648 +++++++++++++++++++++
6 files changed, 708 insertions(+)
create mode 100644 Documentation/ABI/testing/sysfs-bus-iio-adc-max961x
create mode 100644 Documentation/devicetree/bindings/iio/adc/max961x.txt
create mode 100644 drivers/iio/adc/max961x.c
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2.7.4
