From df8a95f46f8e43a24003abe2efaca8c63c895b54 Mon Sep 17 00:00:00 2001 From: Wolfgang Grandegger Date: Wed, 11 Mar 2009 09:36:26 -0600 Subject: 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 Signed-off-by: Grant Likely --- arch/powerpc/include/asm/mpc52xx.h | 1 + 1 file changed, 1 insertion(+) (limited to 'arch/powerpc/include/asm') diff --git a/arch/powerpc/include/asm/mpc52xx.h b/arch/powerpc/include/asm/mpc52xx.h index 81a23932a16..52e049cd9e6 100644 --- a/arch/powerpc/include/asm/mpc52xx.h +++ b/arch/powerpc/include/asm/mpc52xx.h @@ -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 */ -- cgit v1.2.3