iio: distance: srf08: add IIO driver for us ranger

This patch series adds IIO driver support for srf08 ultrasonic ranger devices.

The first patch add a trivial device tree binding for the device together with a new vendor devantech.

The second patch is the IIO driver which in turn is using I2C to talk to the device.

Documentation about the sensor can be found here:

http://www.robot-electronics.co.uk/htm/srf08tech.html

Changes in v2:
Lots of updates thanks to Peters really fast review within 30 minutes after first submission of the driver.

* Patch 2: "iio: distance: srf08: add IIO driver for us ranger"
- alphabetic order in Makefile
- use of u8 while accessing registers
- avoid endianness problems with 16 bit values
- missing return value checks
- some explaining documentation added

Andreas Klinger (2):
iio: distance: srf08: add trivial DT binding
iio: distance: srf08: add IIO driver for us ranger

 .../devicetree/bindings/i2c/trivial-devices.txt    |   1 +
 .../devicetree/bindings/vendor-prefixes.txt        |   1 +
 drivers/iio/proximity/Kconfig                      |  15 +
 drivers/iio/proximity/Makefile                     |   1 +
 drivers/iio/proximity/srf08.c                      | 362 +++++++++++++++++++++
 5 files changed, 380 insertions(+)
 create mode 100644 drivers/iio/proximity/srf08.c

2.1.4