[PATCH 2/2] arm/dts: AM33XX: Add device tree OPP table
AnilKumar Ch
anilkumar at ti.com
Fri Aug 31 19:37:20 EST 2012
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 at ti.com>
---
arch/arm/boot/dts/am335x-bone.dts | 6 ++++++
arch/arm/boot/dts/am335x-evm.dts | 6 ++++++
arch/arm/boot/dts/am33xx.dtsi | 15 +++++++++++++++
3 files changed, 27 insertions(+)
diff --git a/arch/arm/boot/dts/am335x-bone.dts b/arch/arm/boot/dts/am335x-bone.dts
index ce486fc..2767b5f 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 at 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 baa3276..54d972c 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 at 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 ab744d6..2043b53 100644
--- a/arch/arm/boot/dts/am33xx.dtsi
+++ b/arch/arm/boot/dts/am33xx.dtsi
@@ -25,6 +25,21 @@
cpus {
cpu at 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 */
};
};
--
1.7.9.5
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