On Fri, Jun 23, 2017 at 04:04:04PM -0700, Ismail Kose wrote: > From: "Ismail H. Kose" <ihkose@xxxxxxxxx> > > Add iio driver for DS4422/DS4424 chips that support two/four channel 7-bit > Sink/Source Current DAC. > > The driver supports device tree and platfrom files for the configurations. > > Datasheet publicly available at: > https://datasheets.maximintegrated.com/en/ds/DS4422-DS4424.pdf > > Signed-off-by: Ismail Kose <Ismail.Kose@xxxxxxxxxxxxxxxxxxx> > --- > .../devicetree/bindings/iio/dac/ds4424.txt | 41 ++ Please make the binding a separate patch. > drivers/iio/dac/Kconfig | 9 + > drivers/iio/dac/Makefile | 1 + > drivers/iio/dac/ds4424.c | 733 +++++++++++++++++++++ > include/linux/iio/dac/ds4424.h | 29 + > 5 files changed, 813 insertions(+) > create mode 100644 Documentation/devicetree/bindings/iio/dac/ds4424.txt > create mode 100644 drivers/iio/dac/ds4424.c > create mode 100644 include/linux/iio/dac/ds4424.h > > diff --git a/Documentation/devicetree/bindings/iio/dac/ds4424.txt b/Documentation/devicetree/bindings/iio/dac/ds4424.txt > new file mode 100644 > index 000000000000..03c1b575a6db > --- /dev/null > +++ b/Documentation/devicetree/bindings/iio/dac/ds4424.txt > @@ -0,0 +1,41 @@ > +Maxim Integrated DS4422/DS4424 DAC device driver Bindings describe h/w not device drivers. > + > +Required properties: > + - compatible: Must be "maxim,ds4422" or "maxim,ds4424" > + - reg: Should contain the DAC I2C address > + - min_rfs, max_rfs: In order to get the correct processed data values, Don't use '_' in property names, and these all need vendor prefixes. > + these resistor values should be changed to the correct values > + that match the user's system resistor values for RFS0 to RFS1. > + Resistance values for rfs_resistor are listed in 100 Ohm units; > + ie, 800 is 80K. Acceptable RFS values are 40K to 160K. Just use ohms (adding a suffix). Perhaps do a 2 value property with min and max values. > + - ifs_scale: 61000*100 = 6100000 = 100,000,000 * .976/16 > + - max_picoamp: Should contain DAC maximum pico amper value. Add any new units to property-units.txt. > + - rfs_resistor: Should contain reference resistor unit suffix? > + - iio map: Should contain IIO Map info Can't have a space in property names. > + > +Optional properties: > + - vcc-supply: Power supply us optional. If not defined, driver will ignore it. > + > +Example: > + ds4224@10 { > + compatible = "maxim,ds4424"; > + reg = <0x10>; /* When A0, A1 pins are ground */ > + vcc-supply = "dac_vcc_3v3"; > + max-picoamp = <200000000>; /* 200uA */ > + ifs-scale = <61000>; > + /* In order to get the correct processed data values, > + these resistor values should be changed to the correct values that match the > + user's system resistor values for RFS0 to RFS1. > + Resistance values for rfs_resistor are listed in 100 Ohm units; > + ie, 800 is 80K. Acceptable RFS values are 40K to 160K. > + */ > + min-rfs = <400>; > + max-rfs = <1600>; > + rfs-resistors = <400 800 1000 1600>; > + dac-iio-map = Doesn't match above doc. > + /* consumer_dev_name, consumer_channel, adc_channel_label */ > + "ds4424_dac-consumer-dev_name-1", "ds4424_dac1", "OUT1", > + "ds4424_dac-consumer-dev_name-2", "ds4424_dac2", "OUT2", > + "ds4424_dac-consumer-dev_name-3", "ds4424_dac3", "OUT3", > + "ds4424_dac-consumer-dev_name-4", "ds4424_dac4", "OUT4"; > + }; -- To unsubscribe from this list: send the line "unsubscribe linux-iio" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html
