brain-hackers_pepepper-mirror
/
linux-brain
mirror of https://github.com/brain-hackers/linux-brain.git
1
0
Fork 0
Code Issues Projects Releases Wiki Activity

arm64: dts: meson-g12a: enable DVFS on G12A boards 

Enable DVFS for the U200, SEI520 and X96-Max Amlogic G12A based board
by setting the clock, OPP and supply for each CPU cores.

The CPU cluster power supply can achieve 0.73V to 1.01V using a PWM
output clocked at 800KHz with an inverse duty-cycle.

DVFS has been tested by running the arm64 cpuburn at [1] and cycling
between all the possible cpufreq translations and checking the final
frequency using the clock-measurer, script at [2].

[1] https://github.com/ssvb/cpuburn-arm/blob/master/cpuburn-a53.S
[2] https://gist.github.com/superna9999/d4de964dbc0f84b7d527e1df2ddea25f

Reviewed-by: Martin Blumenstingl <martin.blumenstingl@googlemail.com>
Signed-off-by: Neil Armstrong <narmstrong@baylibre.com>
Reviewed-by: Kevin Hilman <khilman@baylibre.com>
Tested-by: Kevin Hilman <khilman@baylibre.com>
Signed-off-by: Kevin Hilman <khilman@baylibre.com>
This commit is contained in:
Neil Armstrong 2019-07-29 15:26:20 +02:00 committed by Kevin Hilman
parent b190056fa9
commit e9bc0765cc
3 changed files with 161 additions and 0 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

55
arch/arm64/boot/dts/amlogic/meson-g12a-sei510.dts
View File

@ -129,6 +129,25 @@
enable-active-high;
};
vddcpu: regulator-vddcpu {
/*
* SY8120B1ABC DC/DC Regulator.
*/
compatible = "pwm-regulator";
regulator-name = "VDDCPU";
regulator-min-microvolt = <721000>;
regulator-max-microvolt = <1022000>;
vin-supply = <&dc_in>;
pwms = <&pwm_AO_cd 1 1250 0>;
pwm-dutycycle-range = <100 0>;
regulator-boot-on;
regulator-always-on;
};
vddio_ao1v8: regulator-vddio_ao1v8 {
compatible = "regulator-fixed";
regulator-name = "VDDIO_AO1V8";
@ -297,6 +316,34 @@
status = "okay";
};
&cpu0 {
cpu-supply = <&vddcpu>;
operating-points-v2 = <&cpu_opp_table>;
clocks = <&clkc CLKID_CPU_CLK>;
clock-latency = <50000>;
};
&cpu1 {
cpu-supply = <&vddcpu>;
operating-points-v2 = <&cpu_opp_table>;
clocks = <&clkc CLKID_CPU_CLK>;
clock-latency = <50000>;
};
&cpu2 {
cpu-supply = <&vddcpu>;
operating-points-v2 = <&cpu_opp_table>;
clocks = <&clkc CLKID_CPU_CLK>;
clock-latency = <50000>;
};
&cpu3 {
cpu-supply = <&vddcpu>;
operating-points-v2 = <&cpu_opp_table>;
clocks = <&clkc CLKID_CPU_CLK>;
clock-latency = <50000>;
};
&cvbs_vdac_port {
cvbs_vdac_out: endpoint {
remote-endpoint = <&cvbs_connector_in>;
@ -345,6 +392,14 @@
pinctrl-names = "default";
};
&pwm_AO_cd {
pinctrl-0 = <&pwm_ao_d_e_pins>;
pinctrl-names = "default";
clocks = <&xtal>;
clock-names = "clkin1";
status = "okay";
};
&pwm_ef {
status = "okay";
pinctrl-0 = <&pwm_e_pins>;

54
arch/arm64/boot/dts/amlogic/meson-g12a-u200.dts
View File

@ -129,6 +129,24 @@
regulator-always-on;
};
vddcpu: regulator-vddcpu {
/*
* MP8756GD Regulator.
*/
compatible = "pwm-regulator";
regulator-name = "VDDCPU";
regulator-min-microvolt = <721000>;
regulator-max-microvolt = <1022000>;
vin-supply = <&main_12v>;
pwms = <&pwm_AO_cd 1 1250 0>;
pwm-dutycycle-range = <100 0>;
regulator-boot-on;
regulator-always-on;
};
};
&cec_AO {
@ -145,6 +163,34 @@
hdmi-phandle = <&hdmi_tx>;
};
&cpu0 {
cpu-supply = <&vddcpu>;
operating-points-v2 = <&cpu_opp_table>;
clocks = <&clkc CLKID_CPU_CLK>;
clock-latency = <50000>;
};
&cpu1 {
cpu-supply = <&vddcpu>;
operating-points-v2 = <&cpu_opp_table>;
clocks = <&clkc CLKID_CPU_CLK>;
clock-latency = <50000>;
};
&cpu2 {
cpu-supply = <&vddcpu>;
operating-points-v2 = <&cpu_opp_table>;
clocks = <&clkc CLKID_CPU_CLK>;
clock-latency = <50000>;
};
&cpu3 {
cpu-supply = <&vddcpu>;
operating-points-v2 = <&cpu_opp_table>;
clocks = <&clkc CLKID_CPU_CLK>;
clock-latency = <50000>;
};
&cvbs_vdac_port {
cvbs_vdac_out: endpoint {
remote-endpoint = <&cvbs_connector_in>;
@ -197,6 +243,14 @@
pinctrl-names = "default";
};
&pwm_AO_cd {
pinctrl-0 = <&pwm_ao_d_e_pins>;
pinctrl-names = "default";
clocks = <&xtal>;
clock-names = "clkin1";
status = "okay";
};
/* SD card */
&sd_emmc_b {
status = "okay";

52
arch/arm64/boot/dts/amlogic/meson-g12a-x96-max.dts
View File

@ -132,6 +132,22 @@
regulator-always-on;
};
vddcpu: regulator-vddcpu {
compatible = "pwm-regulator";
regulator-name = "VDDCPU";
regulator-min-microvolt = <721000>;
regulator-max-microvolt = <1022000>;
vin-supply = <&dc_in>;
pwms = <&pwm_AO_cd 1 1250 0>;
pwm-dutycycle-range = <100 0>;
regulator-boot-on;
regulator-always-on;
};
sound {
compatible = "amlogic,axg-sound-card";
model = "G12A-X96-MAX";
@ -242,6 +258,34 @@
status = "okay";
};
&cpu0 {
cpu-supply = <&vddcpu>;
operating-points-v2 = <&cpu_opp_table>;
clocks = <&clkc CLKID_CPU_CLK>;
clock-latency = <50000>;
};
&cpu1 {
cpu-supply = <&vddcpu>;
operating-points-v2 = <&cpu_opp_table>;
clocks = <&clkc CLKID_CPU_CLK>;
clock-latency = <50000>;
};
&cpu2 {
cpu-supply = <&vddcpu>;
operating-points-v2 = <&cpu_opp_table>;
clocks = <&clkc CLKID_CPU_CLK>;
clock-latency = <50000>;
};
&cpu3 {
cpu-supply = <&vddcpu>;
operating-points-v2 = <&cpu_opp_table>;
clocks = <&clkc CLKID_CPU_CLK>;
clock-latency = <50000>;
};
&cvbs_vdac_port {
cvbs_vdac_out: endpoint {
remote-endpoint = <&cvbs_connector_in>;
@ -279,6 +323,14 @@
pinctrl-names = "default";
};
&pwm_AO_cd {
pinctrl-0 = <&pwm_ao_d_e_pins>;
pinctrl-names = "default";
clocks = <&xtal>;
clock-names = "clkin1";
status = "okay";
};
&ext_mdio {
external_phy: ethernet-phy@0 {
/* Realtek RTL8211F (0x001cc916) */