tree b09273e05b6a8918be77507c4af4d3d5b03cbc73
parent 691aa9c352e49ae3f3228e1b2631e1b8ef2295b9
author Ken Ma <make@marvell.com> 1619789189 +0200
committer Stefan Roese <sr@denx.de> 1621140525 +0200

spi: kirkwood: support extended baud rates

The Armada SoC family implementation of this SPI hardware module has
extended the configuration register to allow for a wider range of SPI
clock rates. Specifically the Serial Baud Rate Pre-selection bits in the
SPI Interface Configuration Register now also use bits 6 and 7 as well.

Modify the baud rate calculation to handle these differences for the
Armada case. Potentially a baud rate can be setup using a number of
different pre-scalar and scalar combinations. This code tries all
possible pre-scalar divisors (8 in total) to try and find the most
accurate set.

Signed-off-by: Ken Ma <make@marvell.com>
Signed-off-by: Stefan Roese <sr@denx.de>