Add proximity sensor driver for Vishay vcnl3020. Only on-demand
measurement is supported for now.

Changes from v4:
   1. add vdd-supply,vddio-supply,interrupts properties into yaml.
   2. led-current -> vishay,led-current-milliamp.
   3. add possible values enum list.
   4. add bulk_read for result hi/lo registers.
   5. add description of vcnl3020_data structure.
   6. vcnl3020 id table is removed.
   7. make "vishay,led-current-milliamp" optional in yaml and code.

Changes from v3:
   1. minor changes.
   2. add i2c block to fix dts section in yaml.

Changes from v2:
   1. using regmap_read_poll_timeout instead of do-while in measurement
      function.
   2. change struct i2client* in vcnl3020_data to struct dev*
   3. enable REGMAP_I2C in Kconfig

Changes from v1:
   1. using regmap interface instead of i2c_smbus_* calls.
   2. switch from probe to probe_new.
   3. s32/int32_t -> int

Ivan Mikhaylov (2):
  iio: proximity: provide device tree binding document
  iio: proximity: Add driver support for vcnl3020 proximity sensor

 .../bindings/iio/proximity/vcnl3020.yaml      |  65 +++++
 drivers/iio/proximity/Kconfig                 |  11 +
 drivers/iio/proximity/Makefile                |   1 +
 drivers/iio/proximity/vcnl3020.c              | 225 ++++++++++++++++++
 4 files changed, 302 insertions(+)
 create mode 100644 Documentation/devicetree/bindings/iio/proximity/vcnl3020.yaml
 create mode 100644 drivers/iio/proximity/vcnl3020.c

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2.21.1