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powerpc/5200: add function to return external clock frequency

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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>
This commit is contained in:
Wolfgang Grandegger
2009-03-11 09:36:26 -06:00
committed by Grant Likely
parent bb899d49a5
commit df8a95f46f
2 changed files with 38 additions and 0 deletions
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arch/powerpc/include/asm/mpc52xx.h
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@@ -273,6 +273,7 @@ extern void mpc5200_setup_xlb_arbiter(void);
extern void mpc52xx_declare_of_platform_devices(void);
extern void mpc52xx_map_common_devices(void);
extern int mpc52xx_set_psc_clkdiv(int psc_id, int clkdiv);
extern unsigned int mpc52xx_get_xtal_freq(struct device_node *node);
extern void mpc52xx_restart(char *cmd);
/* mpc52xx_pic.c */