Jonathan Cameron 009ae227a1 iio: adc: ad7766: Fix alignment for DMA safety ...

____cacheline_aligned is an insufficient guarantee for non-coherent DMA
on platforms with 128 byte cachelines above L1.  Switch to the updated
IIO_DMA_MINALIGN definition.

Update the comment to reflect the fact DMA safety 'may' require
separate cachelines.

Fixes: aa16c6bd0e ("iio:adc: Add support for AD7766/AD7767")
Signed-off-by: Jonathan Cameron <Jonathan.Cameron@huawei.com>
Cc: Lars-Peter Clausen <lars@metafoo.de>
Acked-by: Nuno Sá <nuno.sa@analog.com>
Link: https://lore.kernel.org/r/20220508175712.647246-16-jic23@kernel.org

2022-06-14 11:53:12 +01:00

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