ARM: dts: AM33XX: Add device tree OPP table

Add DT OPP table for AM33XX family of devices. This data is
decoded by OF with of_init_opp_table() helper function.

Also adds cpu0 supply name to the corresponding dts files.
cpu0-supply name is used by cpufreq-cpu0 driver to get the
regulator pointer for voltage modifications.

Signed-off-by: AnilKumar Ch <anilkumar@ti.com>
Signed-off-by: Benoit Cousson <b-cousson@ti.com>

3 files changed, 27 insertions, 0 deletions

diff --git a/arch/arm/boot/dts/am335x-bone.dts b/arch/arm/boot/dts/am335x-bone.dts
index c634f87e230e..91eee97371ea 100644
--- a/arch/arm/boot/dts/am335x-bone.dts
+++ b/arch/arm/boot/dts/am335x-bone.dts
@@ -13,6 +13,12 @@
         model = "TI AM335x BeagleBone";
         compatible = "ti,am335x-bone", "ti,am33xx";
 
+        cpus {
+                cpu@0 {
+                        cpu0-supply = <&dcdc2_reg>;
+                };
+        };
+
         memory {
                 device_type = "memory";
                 reg = <0x80000000 0x10000000>; /* 256 MB */
diff --git a/arch/arm/boot/dts/am335x-evm.dts b/arch/arm/boot/dts/am335x-evm.dts
index 185d6325a458..4707cda9e4fe 100644
--- a/arch/arm/boot/dts/am335x-evm.dts
+++ b/arch/arm/boot/dts/am335x-evm.dts
@@ -13,6 +13,12 @@
         model = "TI AM335x EVM";
         compatible = "ti,am335x-evm", "ti,am33xx";
 
+        cpus {
+                cpu@0 {
+                        cpu0-supply = <&vdd1_reg>;
+                };
+        };
+
         memory {
                 device_type = "memory";
                 reg = <0x80000000 0x10000000>; /* 256 MB */
diff --git a/arch/arm/boot/dts/am33xx.dtsi b/arch/arm/boot/dts/am33xx.dtsi
index bb31bff01998..b4e3e4793b95 100644
--- a/arch/arm/boot/dts/am33xx.dtsi
+++ b/arch/arm/boot/dts/am33xx.dtsi
@@ -25,6 +25,21 @@
         cpus {
                 cpu@0 {
                         compatible = "arm,cortex-a8";
+
+                        /*
+                         * To consider voltage drop between PMIC and SoC,
+                         * tolerance value is reduced to 2% from 4% and
+                         * voltage value is increased as a precaution.
+                         */
+                        operating-points = <
+                                /* kHz    uV */
+                                720000  1285000
+                                600000  1225000
+                                500000  1125000
+                                275000  1125000
+                        >;
+                        voltage-tolerance = <2>; /* 2 percentage */
+                        clock-latency = <300000>; /* From omap-cpufreq driver */
                 };
         };