This enables DVFS for the Amlogic SM1 based SEI610 board by: - Adding the SM1 SoC OPPs taken from the vendor tree - Selecting the SM1 Clock controller instead of the G12A one - Adding the CPU rail regulator, PWM and OPPs for each CPU nodes.
Each power supply can achieve 0.69V to 1.05V using a single PWM output clocked at 666KHz 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 the cpu 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 <narmstr...@baylibre.com> --- .../boot/dts/amlogic/meson-sm1-sei610.dts | 59 ++++++++++++++-- arch/arm64/boot/dts/amlogic/meson-sm1.dtsi | 69 +++++++++++++++++++ 2 files changed, 124 insertions(+), 4 deletions(-) diff --git a/arch/arm64/boot/dts/amlogic/meson-sm1-sei610.dts b/arch/arm64/boot/dts/amlogic/meson-sm1-sei610.dts index 36ac2e4b970d..69966e2e0611 100644 --- a/arch/arm64/boot/dts/amlogic/meson-sm1-sei610.dts +++ b/arch/arm64/boot/dts/amlogic/meson-sm1-sei610.dts @@ -19,10 +19,6 @@ ethernet0 = ðmac; }; - chosen { - stdout-path = "serial0:115200n8"; - }; - emmc_pwrseq: emmc-pwrseq { compatible = "mmc-pwrseq-emmc"; reset-gpios = <&gpio BOOT_12 GPIO_ACTIVE_LOW>; @@ -136,6 +132,25 @@ regulator-always-on; }; + vddcpu: regulator-vddcpu { + /* + * SY8120B1ABC DC/DC Regulator. + */ + compatible = "pwm-regulator"; + + regulator-name = "VDDCPU"; + regulator-min-microvolt = <690000>; + regulator-max-microvolt = <1050000>; + + vin-supply = <&dc_in>; + + pwms = <&pwm_AO_cd 1 1500 0>; + pwm-dutycycle-range = <100 0>; + + regulator-boot-on; + regulator-always-on; + }; + vddio_ao1v8: regulator-vddio_ao1v8 { compatible = "regulator-fixed"; regulator-name = "VDDIO_AO1V8"; @@ -182,6 +197,34 @@ 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_CPU1_CLK>; + clock-latency = <50000>; +}; + +&cpu2 { + cpu-supply = <&vddcpu>; + operating-points-v2 = <&cpu_opp_table>; + clocks = <&clkc CLKID_CPU2_CLK>; + clock-latency = <50000>; +}; + +&cpu3 { + cpu-supply = <&vddcpu>; + operating-points-v2 = <&cpu_opp_table>; + clocks = <&clkc CLKID_CPU3_CLK>; + clock-latency = <50000>; +}; + ðmac { status = "okay"; phy-handle = <&internal_ephy>; @@ -220,6 +263,14 @@ clock-names = "clkin0"; }; +&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>; diff --git a/arch/arm64/boot/dts/amlogic/meson-sm1.dtsi b/arch/arm64/boot/dts/amlogic/meson-sm1.dtsi index 37064d7f66c1..2b61406b0610 100644 --- a/arch/arm64/boot/dts/amlogic/meson-sm1.dtsi +++ b/arch/arm64/boot/dts/amlogic/meson-sm1.dtsi @@ -50,6 +50,71 @@ compatible = "cache"; }; }; + + cpu_opp_table: opp-table { + compatible = "operating-points-v2"; + opp-shared; + + opp-100000000 { + opp-hz = /bits/ 64 <100000000>; + opp-microvolt = <730000>; + }; + + opp-250000000 { + opp-hz = /bits/ 64 <250000000>; + opp-microvolt = <730000>; + }; + + opp-500000000 { + opp-hz = /bits/ 64 <500000000>; + opp-microvolt = <730000>; + }; + + opp-667000000 { + opp-hz = /bits/ 64 <666666666>; + opp-microvolt = <750000>; + }; + + opp-1000000000 { + opp-hz = /bits/ 64 <1000000000>; + opp-microvolt = <770000>; + }; + + opp-1200000000 { + opp-hz = /bits/ 64 <1200000000>; + opp-microvolt = <780000>; + }; + + opp-1404000000 { + opp-hz = /bits/ 64 <1404000000>; + opp-microvolt = <790000>; + }; + + opp-1512000000 { + opp-hz = /bits/ 64 <1500000000>; + opp-microvolt = <800000>; + }; + + opp-1608000000 { + opp-hz = /bits/ 64 <1608000000>; + opp-microvolt = <810000>; + }; + + opp-1704000000 { + opp-hz = /bits/ 64 <1704000000>; + opp-microvolt = <850000>; + }; + + opp-1800000000 { + opp-hz = /bits/ 64 <1800000000>; + opp-microvolt = <900000>; + }; + + opp-1908000000 { + opp-hz = /bits/ 64 <1908000000>; + opp-microvolt = <950000>; + }; + }; }; &cecb_AO { @@ -60,6 +125,10 @@ compatible = "amlogic,meson-sm1-clk-measure"; }; +&clkc { + compatible = "amlogic,sm1-clkc"; +}; + ðmac { power-domains = <&pwrc PWRC_SM1_ETH_ID>; }; -- 2.22.0
