read_raw when buffered sampling enabled

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Greetings,

I see in several iio drivers supporting triggered buffer mode that read_raw
returns -EBUSY when buffered sampling is enabled. This additional logic
is implemented in read_raw using iio_buffer_enabled().
Since some drivers don't implement this I'm wondering wether this logic is
an IIO design requirement or if this is device / driver specific.

Regards,
Grégor.
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