Hello!
Third round for Maxim max9611/max9612 high-side current sense amplifier driver.
For reference, a simplified integration schematic drawing is here reported:
----o----/\/\/-----o-------|LOAD|---
| shunt |
____|______________|___
| RS+ RS- |
| |-----gain-----| |
| | |
| | |
|max9611 |->| ADC |===== I2c
|______________________|
public datasheet available at
https://datasheets.maximintegrated.com/en/ds/MAX9611-MAX9612.pdf
In v2 all channels whose values are calculated using parameters
depending on the applied gain have been transformed in "processed" channels.
In v3 fixed DT bindings to use a more generic name for ADC nodes, and shunt
resistor description property.
output reported from iio_info tool:
iio:device0: max9611_vdd
6 channels found:
voltage0: (input)
1 channel-specific attributes found:
attr 0: input value: 4.085000000
voltage1: (input)
3 channel-specific attributes found:
attr 0: scale value: 14
attr 1: offset value: 1
attr 2: raw value: 59
shunt: (input)
2 channel-specific attributes found:
attr 0: resistor_power value: 5000
attr 1: resistor_current value: 5000
power: (input)
1 channel-specific attributes found:
attr 0: input value: 663.404000000
temp: (input)
2 channel-specific attributes found:
attr 0: scale value: 0.480076812
attr 1: raw value: 59
current: (input)
1 channel-specific attributes found:
attr 0: input value: 817.000000000
Tested on Salvator-X M3-W board.
Thanks
j
v1 -> v2:
- Drop wildcard (max961x) in driver, documentation and dt-bindings. Use
max9611 instead.
- Make 3 processed channels for csa voltage, csa current and power load
- Remove wrapper functions around i2c buffer access
- Add locking in read_raw()
- Make 2 separate attributes for shunt resistor: current and power
- Renamed shunt resistor attribute
- Fixed several review comments
v2 -> v3:
- Incorporated Geert's suggestions on using a more generic name for ADC nodes
in device tree
- Changed "maxim,shunt-resistor-uohm" to "shunt-resistor-uohm"
- Update documentation accordingly to the two previous changes
Jacopo Mondi (4):
Documentation: dt-bindings: iio: Add max9611 ADC
iio: Documentation: Add max9611 sysfs documentation
iio: adc: Add Maxim max9611 ADC driver
arm64: dts: salvator-x: Add current sense amplifiers
.../ABI/testing/sysfs-bus-iio-adc-max9611 | 16 +
.../devicetree/bindings/iio/adc/max9611.txt | 26 +
arch/arm64/boot/dts/renesas/r8a7796-salvator-x.dts | 18 +
drivers/iio/adc/Kconfig | 10 +
drivers/iio/adc/Makefile | 1 +
drivers/iio/adc/max9611.c | 590 +++++++++++++++++++++
6 files changed, 661 insertions(+)
create mode 100644 Documentation/ABI/testing/sysfs-bus-iio-adc-max9611
create mode 100644 Documentation/devicetree/bindings/iio/adc/max9611.txt
create mode 100644 drivers/iio/adc/max9611.c
--
2.7.4
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