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>

diff --git a/arch/arm64/boot/dts/amlogic/meson-g12a.dtsi b/arch/arm64/boot/dts/amlogic/meson-g12a.dtsi
index ac15967bb7fa0967bacd54d28c13bf87e8703ec5..733a9d46fc4bd3f848e7604458c31bf6ed109108 100644 (file)
--- a/arch/arm64/boot/dts/amlogic/meson-g12a.dtsi
+++ b/arch/arm64/boot/dts/amlogic/meson-g12a.dtsi
@@ -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 {