dra7xx cpu frequency change

dra7xx MPU 调整：
1. Uboot the patches as below:
diff --git a/arch/arm/cpu/armv7/omap5/hw_data.c b/arch/arm/cpu/armv7/omap5/hw_data.c index ae25a74..d062708 100644 --- a/arch/arm/cpu/armv7/omap5/hw_data.c +++ b/arch/arm/cpu/armv7/omap5/hw_data.c @@ -42,7 +42,7 @@ static const struct dpll_params mpu_dpll_params_800mhz[NUM_SYS_CLKS] = { /* OPP NOM FREQUENCY for OMAP5 ES2.0, and DRA7 ES1.0 */ static const struct dpll_params mpu_dpll_params_1ghz[NUM_SYS_CLKS] = { {250, 2, 1, 1, -1, -1, -1, -1, -1, -1, -1, -1}, /* 12 MHz */ - {500, 9, 1, 1, -1, -1, -1, -1, -1, -1, -1, -1}, /* 20 MHz */ + {400, 9, 1, 1, -1, -1, -1, -1, -1, -1, -1, -1}, /* 20 MHz */ {119, 1, 1, 1, -1, -1, -1, -1, -1, -1, -1, -1}, /* 16.8 MHz */ {625, 11, 1, 1, -1, -1, -1, -1, -1, -1, -1, -1}, /* 19.2 MHz */ {500, 12, 1, 1, -1, -1, -1, -1, -1, -1, -1, -1}, /* 26 MHz */ @@ -718,7 +718,7 @@ const struct ctrl_ioregs ioregs_dra72x_es2 = {
2. kernel: the patches as below:

diff --git a/arch/arm/boot/dts/dra7.dtsi b/arch/arm/boot/dts/dra7.dtsi
index 4fa2eed..852f74a 100644
--- a/arch/arm/boot/dts/dra7.dtsi
+++ b/arch/arm/boot/dts/dra7.dtsi
@@ -102,8 +102,8 @@
        compatible = "operating-points-v2";
        opp-shared;
 
-       opp_nom@1000000000 {
-           opp-hz = /bits/ 64 <1000000000>;
+       opp_nom@800000000 {
+           opp-hz = /bits/ 64 <800000000>;
            opp-microvolt = <1060000 850000 1150000>;
            opp-supported-hw = <0xFF 0x01>;
            opp-suspend;

3. test 

1. mhz
root@dra7xx-evm:~# mhz
800 MHz, 1.2500 nanosec clock

2.get cur
root@dra7xx-evm:~#  cat /sys/devices/system/cpu/cpu0/cpufreq/cpuinfo_cur_freq
800000