Add support for buffers to make the driver fit for more use cases.
Signed-off-by: NMarcus Folkesson <marcus.folkesson@gmail.com>
Reviewed-by: NAndy Shevchenko <andy.shevchenko@gmail.com>
Link: https://lore.kernel.org/r/20220815061625.35568-6-marcus.folkesson@gmail.comSigned-off-by: NJonathan Cameron <Jonathan.Cameron@huawei.com>