Hi there,
fifth round for max9611/9612 ADC iio driver.
I have changed dt-bindings to use "shunt-resistor-micro-ohms" as ina2xx does,
and changed the sysfs attributes exposing the shunt resistor value to use Ohms
as units.
Output of iio_info on Salvator-X board for max9611 chip installed on
VDD_0.8 lines.
The VDD_0.8 line powers the CPU cluster and on-board RAM.
iio:device0: max9611
5 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
power: (input)
2 channel-specific attributes found:
attr 0: shunt_resistor value: 5.000
attr 1: input value: 663.404000000
current: (input)
2 channel-specific attributes found:
attr 0: shunt_resistor value: 5.000
attr 1: input value: 817.000000000
temp: (input)
2 channel-specific attributes found:
attr 0: scale value: 480.076812289
attr 1: raw value: 59
The collected information represent:
* voltage0 (current sense voltage) Vcsa
voltage drop between RS+ and RS- input = 4,085 mV
* voltage1: (common input voltage) Vcim
voltage at RS+ input = (59 - 1) * 14 = 812 mV
* current flowing on shunt resistor (Icsa)
= Vcsa / Rshunt = 817 mA
* power load on the sensed line (Pload)
= Vcim * Icsa = 663 m
* die temperature = (57 * 480.07) = 27360 milli Celsius
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
v3 -> v4:
- Move all locking to read_single() function
- Re-structure read_raw() with Jonathan's and Peter's comments
- Rename some defines pre-pending MAX9611 prefix
- Use values from .comaptible entries for device name
- Change temperature scale to have a value in milli Celsius
- Simplify init routine using read_single
v4 -> v5:
- Change device tree property name for shunt resistor in
"shunt-resistor-micro-ohms"
- Display shunt resistor value with Ohms as units in sysfs
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 | 17 +
.../devicetree/bindings/iio/adc/max9611.txt | 27 +
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 | 587 +++++++++++++++++++++
6 files changed, 660 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
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2.7.4
