tree d6e142b7618268be43935a39e1168ab8fa2e1f28
parent b54ea82f01282253c85eb7e2fd2b6c96f7a027d8
author Valentin Longchamp <valentin.longchamp@keymile.com> 1487327385 +0100
committer Scott Wood <oss@buserror.net> 1493533911 -0500

soc/fsl/qe: round brg_freq to 1kHz granularity

Because of integer computation rounding in u-boot (that sets the QE
brg-frequency DTS prop), the clk value is 99999999 Hz even though it is
100 MHz.

When setting brg clks that are exact divisors of 100 MHz, this small
differnce plays a role and can result in lower clks to be output (for
instance 20 MHz - divide by 5 - results in 16.666 MHz - divide by 6).

This patch fixes that by "forcing" the brg_clk to the nearest kHz when
the difference is below 2 integer rounding errors (i.e. 4).

Signed-off-by: Valentin Longchamp <valentin.longchamp@keymile.com>
Signed-off-by: Scott Wood <oss@buserror.net>