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Commit d14734a0 authored by Neil Armstrong's avatar Neil Armstrong Committed by Kevin Hilman
Browse files

arm64: dts: meson-g12b-odroid-n2: enable DVFS 

Enable DVFS for the Odroid-N2 by setting the clock, OPP and supply
for each cores of each CPU clusters.

The first cluster uses the "VDDCPU_B" power supply, and the second
cluster uses the "VDDCPU_A" power supply.

Each power supply can achieve 0.73V to 1.01V using 2 distinct PWM
outputs 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 of each cluster 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: default avatarMartin Blumenstingl <martin.blumenstingl@googlemail.com>
Signed-off-by: default avatarNeil Armstrong <narmstrong@baylibre.com>
Reviewed-by: default avatarKevin Hilman <khilman@baylibre.com>
Tested-by: default avatarKevin Hilman <khilman@baylibre.com>
Signed-off-by: default avatarKevin Hilman <khilman@baylibre.com>
parent c6d29c66

arch/arm64/boot/dts/amlogic/meson-g12b-odroid-n2.dts

+96 −0
Original line number Diff line number Diff line
@@ -115,6 +115,44 @@ 
		/* FIXME: actually controlled by VDDCPU_B_EN */

	};



	vddcpu_a: regulator-vddcpu-a {

		/*

		 * MP8756GD Regulator.

		 */

		compatible = "pwm-regulator";



		regulator-name = "VDDCPU_A";

		regulator-min-microvolt = <721000>;

		regulator-max-microvolt = <1022000>;



		vin-supply = <&main_12v>;



		pwms = <&pwm_ab 0 1250 0>;

		pwm-dutycycle-range = <100 0>;



		regulator-boot-on;

		regulator-always-on;

	};



	vddcpu_b: regulator-vddcpu-b {

		/*

		 * Silergy SY8120B1ABC Regulator.

		 */

		compatible = "pwm-regulator";



		regulator-name = "VDDCPU_B";

		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;

	};



	hub_5v: regulator-hub_5v {

		compatible = "regulator-fixed";

		regulator-name = "HUB_5V";
@@ -246,6 +284,48 @@ 
	status = "okay";

};



&cpu0 {

	cpu-supply = <&vddcpu_b>;

	operating-points-v2 = <&cpu_opp_table_0>;

	clocks = <&clkc CLKID_CPU_CLK>;

	clock-latency = <50000>;

};



&cpu1 {

	cpu-supply = <&vddcpu_b>;

	operating-points-v2 = <&cpu_opp_table_0>;

	clocks = <&clkc CLKID_CPU_CLK>;

	clock-latency = <50000>;

};



&cpu100 {

	cpu-supply = <&vddcpu_a>;

	operating-points-v2 = <&cpub_opp_table_1>;

	clocks = <&clkc CLKID_CPUB_CLK>;

	clock-latency = <50000>;

};



&cpu101 {

	cpu-supply = <&vddcpu_a>;

	operating-points-v2 = <&cpub_opp_table_1>;

	clocks = <&clkc CLKID_CPUB_CLK>;

	clock-latency = <50000>;

};



&cpu102 {

	cpu-supply = <&vddcpu_a>;

	operating-points-v2 = <&cpub_opp_table_1>;

	clocks = <&clkc CLKID_CPUB_CLK>;

	clock-latency = <50000>;

};



&cpu103 {

	cpu-supply = <&vddcpu_a>;

	operating-points-v2 = <&cpub_opp_table_1>;

	clocks = <&clkc CLKID_CPUB_CLK>;

	clock-latency = <50000>;

};



&ext_mdio {

	external_phy: ethernet-phy@0 {

		/* Realtek RTL8211F (0x001cc916) */
@@ -317,6 +397,22 @@ 
	pinctrl-names = "default";

};



&pwm_ab {

	pinctrl-0 = <&pwm_a_e_pins>;

	pinctrl-names = "default";

	clocks = <&xtal>;

	clock-names = "clkin0";

	status = "okay";

};



&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";