iio: ad9523: support for external signals via gpios
The AD9523 supports external signals for power-down mode, resetting the device and sync timing. This change add support for specifying values for these signals via the gpios and initializing them default values. For the reset signal, the GPIO is toggled during probing to re-initialize the device to a known state. Signed-off-by: NMichael Hennerich <michael.hennerich@analog.com> Signed-off-by: NLars-Peter Clausen <lars@metafoo.de> Signed-off-by: NAlexandru Ardelean <alexandru.ardelean@analog.com> Signed-off-by: NJonathan Cameron <Jonathan.Cameron@huawei.com>
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