| Message ID | 20190620150013.13462-15-narmstrong@baylibre.com (mailing list archive) |
|---|---|
| State | RFC |
| Headers | show |
| Series | arm64: g12a: add support for DVFS | expand |
On 20/06/2019 17:00, Neil Armstrong wrote: > 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 > > Signed-off-by: Neil Armstrong <narmstrong@baylibre.com> > --- > .../boot/dts/amlogic/meson-g12b-odroid-n2.dts | 96 +++++++++++++++++++ > 1 file changed, 96 insertions(+) > > diff --git a/arch/arm64/boot/dts/amlogic/meson-g12b-odroid-n2.dts b/arch/arm64/boot/dts/amlogic/meson-g12b-odroid-n2.dts > index c3e0735e6d9f..0db1547bfb5a 100644 > --- a/arch/arm64/boot/dts/amlogic/meson-g12b-odroid-n2.dts > +++ b/arch/arm64/boot/dts/amlogic/meson-g12b-odroid-n2.dts > @@ -114,6 +114,44 @@ [...] I just ran a 4days long test, leading to ~4 729 015 transitions. Here are the cpufreq trans_table content : Cortex-A53: From : To : 100000 250000 500000 666666 1000000 1200000 1398000 1512000 1608000 1704000 1896000 100000: 0 30975 20650 20649 20649 20649 20649 20649 20649 20649 20649 250000: 20650 0 30975 20649 20649 20649 20649 20649 20649 20649 20649 500000: 20650 20650 0 30973 20649 20648 20648 20648 20648 20648 20648 666666: 20649 20649 20649 0 30972 20648 20648 20648 20648 20648 20648 1000000: 20649 20649 20649 20648 0 30972 20648 20648 20648 20648 20648 1200000: 20649 20649 20648 20648 20648 0 30972 20648 20648 20648 20648 1398000: 20649 20649 20648 20648 20648 20648 0 30972 20648 20648 20648 1512000: 20649 20649 20648 20648 20648 20648 20648 0 30972 20648 20648 1608000: 20649 20649 20648 20648 20648 20648 20648 20648 0 30972 20648 1704000: 20649 20649 20648 20648 20648 20648 20648 20648 20648 0 30972 1896000: 30973 20649 20648 20648 20648 20648 20648 20648 20648 20648 0 Cortex-A73: From : To : 100000 250000 500000 666666 1000000 1200000 1398000 1512000 1704000 100000: 0 45964 30643 30643 30643 30642 30642 30642 30642 250000: 30643 0 45963 30642 30642 30642 30642 30642 30642 500000: 30643 30642 0 45963 30642 30642 30642 30642 30642 666666: 30643 30642 30642 0 45963 30642 30642 30642 30642 1000000: 30643 30642 30642 30642 0 45963 30642 30642 30642 1200000: 30642 30642 30642 30642 30642 0 45963 30642 30642 1398000: 30642 30642 30642 30642 30642 30642 0 45963 30642 1512000: 30642 30642 30642 30642 30642 30642 30642 0 45963 1704000: 45963 30642 30642 30642 30642 30642 30642 30642 0 Neil
diff --git a/arch/arm64/boot/dts/amlogic/meson-g12b-odroid-n2.dts b/arch/arm64/boot/dts/amlogic/meson-g12b-odroid-n2.dts index c3e0735e6d9f..0db1547bfb5a 100644 --- a/arch/arm64/boot/dts/amlogic/meson-g12b-odroid-n2.dts +++ b/arch/arm64/boot/dts/amlogic/meson-g12b-odroid-n2.dts @@ -114,6 +114,44 @@ /* 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"; @@ -245,6 +283,48 @@ 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) */ @@ -308,6 +388,22 @@ 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";
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 Signed-off-by: Neil Armstrong <narmstrong@baylibre.com> --- .../boot/dts/amlogic/meson-g12b-odroid-n2.dts | 96 +++++++++++++++++++ 1 file changed, 96 insertions(+)