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Make use of the AD7991_REF_SEL bit and support using the external reference voltage if 'vref-supply' is present. Use VCC voltage supply as reference if no extra reference is supplied. Signed-off-by: Florian Boor <florian.boor@kernelconcepts.de> Link: https://lore.kernel.org/r/20210930104249.2924336-1-florian.boor@kernelconcepts.de Signed-off-by: Jonathan Cameron <Jonathan.Cameron@huawei.com>
iio: adc: ad799x: Implement selecting external reference voltage input on AD7991, AD7995 and AD7999.
Linux kernel
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