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Allow AM335x MPU core clock speed to be specified in the board config file

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Allow AM335x MPU core clock speed to be specified in the board config file.
To use, add the following to the board's config file:-

#define CONFIG_SYS_MPUCLK	<desired clock freq in MHz>

Signed-off-by: Mark Jackson <mpfj@newflow.co.uk>
Acked-by: Peter Korsgaard <jacmet@sunsite.dk>
This commit is contained in:
Mark Jackson 2013-03-04 01:27:20 +00:00 • committed by Tom Rini
parent f35034fe16
commit fc33705e66
2 changed files with 9 additions and 2 deletions
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4
README
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@ -3878,6 +3878,10 @@ Low Level (hardware related) configuration options:
If defined, the x86 reset vector code is included. This is not
needed when U-Boot is running from Coreboot.
- CONFIG_SYS_MPUCLK
Defines the MPU clock speed (in MHz).
NOTE : currently only supported on AM335x platforms.
Freescale QE/FMAN Firmware Support:
-----------------------------------

7
arch/arm/include/asm/arch-am33xx/clocks_am33xx.h
View file

@ -21,8 +21,11 @@
#define OSC (V_OSCK/1000000)
/* MAIN PLL Fdll = 550 MHZ, */
#define MPUPLL_M 550
/* MAIN PLL Fdll = 550 MHz, by default */
#ifndef CONFIG_SYS_MPUCLK
#define CONFIG_SYS_MPUCLK 550
#endif
#define MPUPLL_M CONFIG_SYS_MPUCLK
#define MPUPLL_N (OSC-1)
#define MPUPLL_M2 1