iio: adc: ab8500-gpadc: Support non-hw-conversion
The hardware conversion mode only exists in the AB8500 version of the chip, as it is lacking in the AB8505 it will not be in the device tree and we should just not even try to obtain it. The driver already contains code to avoid using a non-existing hardware conversion IRQ at conversion time. Signed-off-by: Linus Walleij <linus.walleij@linaro.org> Link: https://lore.kernel.org/r/20201218222013.383704-1-linus.walleij@linaro.orgSigned-off-by: Jonathan Cameron <Jonathan.Cameron@huawei.com>
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