==============================
  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            |
    +-----------------+---------------+