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arm64: dts: meson-g12a: add cpus OPP table 

Add the OPP table taken from the vendor u200 and u211 DTS.

The Amlogic G12A SoC seems to available in 3 types :
- low-speed: up to 1,8GHz
- mid-speed: up to 1,908GHz
- high-speed: up to 2.1GHz

And the S905X2 opp voltages are slightly higher than the S905D2
OPP voltages for the low-speed table.

This adds the conservative OPP table with the S905X2 higher voltages
and the maximum low-speed OPP frequency.

The values were tested to be stable on an Amlogic U200 Reference Board,
SeiRobotics SEI510 and X96 Max Set-Top-Boxes 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

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 15:26:19 +02:00 committed by Kevin Hilman
parent cca30c8912
commit b190056fa9
1 changed files with 60 additions and 0 deletions
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60
arch/arm64/boot/dts/amlogic/meson-g12a.dtsi
View File

@ -48,6 +48,66 @@ l2: l2-cache0 {
compatible = "cache";
};
};
cpu_opp_table: opp-table {
compatible = "operating-points-v2";
opp-shared;
opp-100000000 {
opp-hz = /bits/ 64 <100000000>;
opp-microvolt = <731000>;
};
opp-250000000 {
opp-hz = /bits/ 64 <250000000>;
opp-microvolt = <731000>;
};
opp-500000000 {
opp-hz = /bits/ 64 <500000000>;
opp-microvolt = <731000>;
};
opp-667000000 {
opp-hz = /bits/ 64 <666666666>;
opp-microvolt = <731000>;
};
opp-1000000000 {
opp-hz = /bits/ 64 <1000000000>;
opp-microvolt = <731000>;
};
opp-1200000000 {
opp-hz = /bits/ 64 <1200000000>;
opp-microvolt = <731000>;
};
opp-1398000000 {
opp-hz = /bits/ 64 <1398000000>;
opp-microvolt = <761000>;
};
opp-1512000000 {
opp-hz = /bits/ 64 <1512000000>;
opp-microvolt = <791000>;
};
opp-1608000000 {
opp-hz = /bits/ 64 <1608000000>;
opp-microvolt = <831000>;
};
opp-1704000000 {
opp-hz = /bits/ 64 <1704000000>;
opp-microvolt = <861000>;
};
opp-1800000000 {
opp-hz = /bits/ 64 <1800000000>;
opp-microvolt = <981000>;
};
};
};
&sd_emmc_a {