[PATCH v2 03/25] power: supply: axp20x_usb_power: use IIO channels when available

Hi,

On Fri, Jan 27, 2017 at 09:54:36AM +0100, Quentin Schulz wrote:

The X-Powers AXP20X PMIC exposes the current current and voltage
measures via an internal ADC.

This adds the possibility to read IIO channels directly for processed
values rather than reading the registers and computing the value.

For backward compatibility purpose, if the IIO driver is not compiled,
this driver will fall back on previous behaviour which is direct
register readings.

Signed-off-by: Quentin Schulz <redacted>

I queued this into power-supply's for next branch.

-- Sebastian
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