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authorIcenowy Zheng <icenowy@aosc.io>2018-02-06 07:49:00 +0300
committerChen-Yu Tsai <wens@csie.org>2018-04-20 09:39:16 +0300
commitdceecd9134178e010345bb3b6653d237a88546dd (patch)
tree84b3d028c2611e2fdb79207e1c2a4f8cba592722 /arch/arm/boot/dts/sun8i-h3.dtsi
parent7824fcb38c1c9c9157ded239cdb78afe20115224 (diff)
downloadlinux-dceecd9134178e010345bb3b6653d237a88546dd.tar.xz
ARM: dts: sun8i: h3: add operating-points-v2 table for CPU
The CPU on Allwinner H3 can do dynamic frequency scaling. Add a DVFS table based on the one shipped with Allwinner's H3 SDK. The voltage-frequency relationship seems to be conservative, and Armbian has another DVFS table which uses lower voltage at a certain frequency. However, the official one is chosen for safety. Frequencies higher than 1008MHz are temporarily dropped in the table, as they may lead to over voltage on boards without proper regulator settings or over temperature on boards with proper regulator settings. They will be added back once regulator settings are ready and thermal sensor driver is merged. In order to satisfy all different regulators (SY8106A which is 50mV per level, SY8113B which have two states: 1.1V and 1.3V, and some board with non-tweakable regulators), all the OPPs are defined with a range which has the target value as the minimum allowed value, and 1.3V (the highest VDD-CPUX voltage suggested by the datasheet) as the maximum allowed value. It's proven to work well with a board with SY8113B. Signed-off-by: Icenowy Zheng <icenowy@aosc.io> Signed-off-by: Chen-Yu Tsai <wens@csie.org>
Diffstat (limited to 'arch/arm/boot/dts/sun8i-h3.dtsi')
-rw-r--r--arch/arm/boot/dts/sun8i-h3.dtsi32
1 files changed, 31 insertions, 1 deletions
diff --git a/arch/arm/boot/dts/sun8i-h3.dtsi b/arch/arm/boot/dts/sun8i-h3.dtsi
index 10da8ed7db81..41d57c76f290 100644
--- a/arch/arm/boot/dts/sun8i-h3.dtsi
+++ b/arch/arm/boot/dts/sun8i-h3.dtsi
@@ -43,32 +43,62 @@
#include "sunxi-h3-h5.dtsi"
/ {
+ cpu0_opp_table: opp_table0 {
+ compatible = "operating-points-v2";
+ opp-shared;
+
+ opp@648000000 {
+ opp-hz = /bits/ 64 <648000000>;
+ opp-microvolt = <1040000 1040000 1300000>;
+ clock-latency-ns = <244144>; /* 8 32k periods */
+ };
+
+ opp@816000000 {
+ opp-hz = /bits/ 64 <816000000>;
+ opp-microvolt = <1100000 1100000 1300000>;
+ clock-latency-ns = <244144>; /* 8 32k periods */
+ };
+
+ opp@1008000000 {
+ opp-hz = /bits/ 64 <1008000000>;
+ opp-microvolt = <1200000 1200000 1300000>;
+ clock-latency-ns = <244144>; /* 8 32k periods */
+ };
+ };
+
cpus {
#address-cells = <1>;
#size-cells = <0>;
- cpu@0 {
+ cpu0: cpu@0 {
compatible = "arm,cortex-a7";
device_type = "cpu";
reg = <0>;
+ clocks = <&ccu CLK_CPUX>;
+ clock-names = "cpu";
+ operating-points-v2 = <&cpu0_opp_table>;
+ #cooling-cells = <2>;
};
cpu@1 {
compatible = "arm,cortex-a7";
device_type = "cpu";
reg = <1>;
+ operating-points-v2 = <&cpu0_opp_table>;
};
cpu@2 {
compatible = "arm,cortex-a7";
device_type = "cpu";
reg = <2>;
+ operating-points-v2 = <&cpu0_opp_table>;
};
cpu@3 {
compatible = "arm,cortex-a7";
device_type = "cpu";
reg = <3>;
+ operating-points-v2 = <&cpu0_opp_table>;
};
};