On 15/01/17 14:13, jacopo mondi wrote: > Hi Jonathan, > thanks for review, > > On 13/01/2017 10:50, Jacopo Mondi wrote: >> Hello, >> sending out v4 splitting device tree bindings documentation and actual ADC >> driver. >> No changes in driver code since v3. >> >> Same question for iio maintainers here: >> I would like to have clarified the measure unit returned by read_raw(). >> Currently (value_raw * value_scale) return the ADC input value in mV. Good. >> While testing the patch I've been questioned if that should not actually >> be in uV. This is easily achievable making _scale return a value in uV. >> I have found no mention of this in the ABI documentation as it speaks of >> generic voltage. Can we have a final word on this? > > I see you have reviewed the driver without complaining for the > read_raw() measure unit, so I assume this replies to the above > question as well... > The units are specified in Documentation/ABI/testing/sysfs-bus-iio.
> What: /sys/bus/iio/devices/iio:deviceX/in_voltageY_raw > What: /sys/bus/iio/devices/iio:deviceX/in_voltageY_supply_raw > What: /sys/bus/iio/devices/iio:deviceX/in_voltageY_i_raw > What: /sys/bus/iio/devices/iio:deviceX/in_voltageY_q_raw > KernelVersion: 2.6.35 > Contact: linux-...@vger.kernel.org > Description: > Raw (unscaled no bias removal etc.) voltage measurement from > channel Y. In special cases where the channel does not > correspond to externally available input one of the named > versions may be used. The number must always be specified and > unique to allow association with event codes. Units after > application of scale and offset are millivolts. So millivolts. This comes from a, perhaps ill judged, decision to match hwmon units were we could. Jonathan > Thanks j > >> >> Thanks Marek for having tested this. >> >> v1 -> v2: >> - incorporated pmeerw's review comments >> - retrieve vref from dts and use that to convert read_raw result >> to mV >> - add device tree bindings documentation >> >> v2 -> v3: >> - add _SCALE bit of read_raw function and change _RAW bit accordingly >> - call regulator_get_voltage when accessing the _SCALE part of read_raw >> and not during probe >> - add back remove function as regulator has to be disabled when detaching >> the module. Do not use devm_ version of iio_register/unregister >> functions >> anymore but do unregister in the remove. >> - remove mutex as access to SPI bus is protected by SPI core. Thanks >> marex >> >> v3 -> v4: >> - split device tree binding documentation and actual ADC driver >> - add "reg" to the list of required properties and use a better >> namimg for the adc device node in bindings documentation as suggested >> by Geert. >> >> Jacopo Mondi (2): >> iio: adc: Add Maxim MAX11100 driver >> dt-bindings: iio: document MAX11100 ADC >> >> .../devicetree/bindings/iio/adc/max11100.txt | 19 +++ >> drivers/iio/adc/Kconfig | 9 + >> drivers/iio/adc/Makefile | 1 + >> drivers/iio/adc/max11100.c | 187 >> +++++++++++++++++++++ >> 4 files changed, 216 insertions(+) >> create mode 100644 Documentation/devicetree/bindings/iio/adc/max11100.txt >> create mode 100644 drivers/iio/adc/max11100.c >> >
