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    Subject[PATCH 3/6] arm64: dts: meson-g12a: add cpus OPP table
    Date
    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>
    ---
    arch/arm64/boot/dts/amlogic/meson-g12a.dtsi | 60 +++++++++++++++++++++
    1 file changed, 60 insertions(+)

    diff --git a/arch/arm64/boot/dts/amlogic/meson-g12a.dtsi b/arch/arm64/boot/dts/amlogic/meson-g12a.dtsi
    index ac15967bb7fa..733a9d46fc4b 100644
    --- a/arch/arm64/boot/dts/amlogic/meson-g12a.dtsi
    +++ b/arch/arm64/boot/dts/amlogic/meson-g12a.dtsi
    @@ -48,6 +48,66 @@
    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 {
    --
    2.22.0
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