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 Hz>
Signed-off-by: Mark Jackson <m...@newflow.co.uk>
---
Changes in v3:
- Changed from V_MPUCLK to CONFIG_SYS_MPUCLK
- Added entry in README
Changes in v2:
- Tweaked after comments from Peter Korsgaard
README | 4 ++++
arch/arm/include/asm/arch-am33xx/clocks_am33xx.h | 7 +++++--
2 files changed, 9 insertions(+), 2 deletions(-)
diff --git a/README b/README
index d8cb394..ddf6df2 100644
--- a/README
+++ b/README
@@ -3820,6 +3820,10 @@ 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 Hz).
+
+ NOTE : currently only supported on AM335x platforms.
Freescale QE/FMAN Firmware Support:
-----------------------------------
diff --git a/arch/arm/include/asm/arch-am33xx/clocks_am33xx.h
b/arch/arm/include/asm/arch-am33xx/clocks_am33xx.h
index d748dd2..5f2939b 100644
--- a/arch/arm/include/asm/arch-am33xx/clocks_am33xx.h
+++ b/arch/arm/include/asm/arch-am33xx/clocks_am33xx.h
@@ -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 550000000
+#endif
+#define MPUPLL_M (CONFIG_SYS_MPUCLK/1000000)
#define MPUPLL_N (OSC-1)
#define MPUPLL_M2 1
--
1.7.9.5
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