spi: armada-3700: Fix padding when sending not 4-byte aligned data

In 4-byte transfer mode, extra padding/dummy bytes '0xff' would be
sent in write operation if TX data is not 4-byte aligned since the
SPI data register is always shifted out as whole 4 bytes.

Fix this by using the header count feature that allows to transfer 0 to
4 bytes. Use it to actually send the first 1 to 3 bytes of data before
the rest of the buffer that will hence be 4-byte aligned.

Signed-off-by: Zachary Zhang <[email protected]>
Signed-off-by: Miquel Raynal <[email protected]>
Signed-off-by: Mark Brown <[email protected]>

0 files changed, 0 insertions, 0 deletions