tree fae717fe24d3b6dc00cc672d9071a0efd9b25f55
parent e50345b36f794afecc4b63d01b8341de49be7234
author Zhu, Yunge <yunge.zhu@linux.intel.com> 1554853776 -0400
committer Zhu, Yunge <yunge.zhu@linux.intel.com> 1554938194 +0000

[ADC-GPIO]Enabling ADC-Gpio Bridge

Commit 2: bridge
In case a channel has a bridge circuit,
we have to turn the bridge on prior to reading a value at least for one scan cycle
to get a valid value.
Add support for ADC channel controlled by GPIO.
For example,ADC channel8, connected to CMOS battery, is controlled by a GPIO.
Need set 1 to gpio when Channel8 sampling, and set 0 to gpio when finish sampling.

Another Commit 1:Enable ADC Gpio bridge configuration

Tested:
P3VBAT previous value is 0.4V
P3VBAT sensor reading  now:3.0843V

Change-Id: I64325845dfd4a931d0beda28993f6b15fa31ae95
Signed-off-by: Zhu, Yunge <yunge.zhu@linux.intel.com>