tree cee931917b5bbc3e77d9b3e2ad3145856d8118b8
parent bb899d49a5d04ae53c787c15c5fb82754d6a0da4
author Wolfgang Grandegger <wg@grandegger.com> 1236785786 -0600
committer Grant Likely <grant.likely@secretlab.ca> 1236785786 -0600

powerpc/5200: add function to return external clock frequency

This patch adds the utility function mpc52xx_get_xtal_freq() to get
the frequency of the external oscillator clock connected to the pin
SYS_XTAL_IN. The MSCAN may us it as clock source. Unfortunately, this
value is not available from the FDT blob, but it can be determined
from the IPB frequency.

Signed-off-by: Wolfgang Grandegger <wg@grandegger.com>
Signed-off-by: Grant Likely <grant.likely@secretlab.ca>