From: Mark Jackson <mpfj-list@mimc.co.uk>
Date: Mon, 4 Mar 2013 01:27:20 +0000 (+0000)
Subject: Allow AM335x MPU core clock speed to be specified in the board config file
X-Git-Tag: v2025.01-rc5-pxa1908~16341^2~6^2~22
X-Git-Url: http://git.dujemihanovic.xyz/img/html/static/%7B%7B%20.Permalink%20%7D%7D?a=commitdiff_plain;h=fc33705e66cc2c753026f04f92555ad00b709f11;p=u-boot.git

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

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>
---

diff --git a/README b/README
index 7f2506a9b9..a73234efdc 100644
--- a/README
+++ b/README
@@ -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:
 -----------------------------------
diff --git a/arch/arm/include/asm/arch-am33xx/clocks_am33xx.h b/arch/arm/include/asm/arch-am33xx/clocks_am33xx.h
index d748dd2787..2d960070f1 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	550
+#endif
+#define MPUPLL_M	CONFIG_SYS_MPUCLK
 #define MPUPLL_N	(OSC-1)
 #define MPUPLL_M2	1