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diff --git a/Documentation/iio/ep93xx_adc.rst b/Documentation/iio/ep93xx_adc.rst new file mode 100644 index 000000000000..4fd8dea3f6b8 --- /dev/null +++ b/Documentation/iio/ep93xx_adc.rst @@ -0,0 +1,40 @@ +============================== +Cirrus Logic EP93xx ADC driver +============================== + +1. Overview +=========== + +The driver is intended to work on both low-end (EP9301, EP9302) devices with +5-channel ADC and high-end (EP9307, EP9312, EP9315) devices with 10-channel +touchscreen/ADC module. + +2. Channel numbering +==================== + +Numbering scheme for channels 0..4 is defined in EP9301 and EP9302 datasheets. +EP9307, EP9312 and EP9312 have 3 channels more (total 8), but the numbering is +not defined. So the last three are numbered randomly, let's say. + +Assuming ep93xx_adc is IIO device0, you'd find the following entries under +/sys/bus/iio/devices/iio:device0/: + + +-----------------+---------------+ + | sysfs entry | ball/pin name | + +=================+===============+ + | in_voltage0_raw | YM | + +-----------------+---------------+ + | in_voltage1_raw | SXP | + +-----------------+---------------+ + | in_voltage2_raw | SXM | + +-----------------+---------------+ + | in_voltage3_raw | SYP | + +-----------------+---------------+ + | in_voltage4_raw | SYM | + +-----------------+---------------+ + | in_voltage5_raw | XP | + +-----------------+---------------+ + | in_voltage6_raw | XM | + +-----------------+---------------+ + | in_voltage7_raw | YP | + +-----------------+---------------+ |