spi: Introduce and use spi_bpw_to_bytes()

Merge series from Andy Shevchenko <andriy.shevchenko@linux.intel.com>:

Recently in the discussion with David the idea of having
a common helper popped up. The helper converts the given
bits per word to bytes. The result will always be power-of-two
(e.g. for 37 bits it returns 8 bytes) or 0 for 0 input.
More details are in the respective code comment.

This mini-series introduces it and replaces current users
under drivers/spi and we expect more (and possibly some
lurking in other subsystems).

1 files changed, 1 insertions, 1 deletions

diff --git a/drivers/spi/spi.c b/drivers/spi/spi.c
index b0e7702951fe..1bc0fdbb1bd7 100644
--- a/drivers/spi/spi.c
+++ b/drivers/spi/spi.c
@@ -3800,7 +3800,7 @@ int spi_split_transfers_maxwords(struct spi_controller *ctlr,
 		size_t maxsize;
 		int ret;
 
-		maxsize = maxwords * roundup_pow_of_two(BITS_TO_BYTES(xfer->bits_per_word));
+		maxsize = maxwords * spi_bpw_to_bytes(xfer->bits_per_word);
 		if (xfer->len > maxsize) {
 			ret = __spi_split_transfer_maxsize(ctlr, msg, &xfer,
 							   maxsize);