Hi Claudiu,
CC Energy Model
On Tue, 28 Jan 2025 at 15:56, Claudiu <claudiu.beznea@xxxxxxxxx> wrote:
> From: Claudiu Beznea <claudiu.beznea.uj@xxxxxxxxxxxxxx>
>
> Add OPP table for the Renesas RZ/G3S SoC.
>
> Signed-off-by: Claudiu Beznea <claudiu.beznea.uj@xxxxxxxxxxxxxx>
Thanks for your patch!
> --- a/arch/arm64/boot/dts/renesas/r9a08g045.dtsi
> +++ b/arch/arm64/boot/dts/renesas/r9a08g045.dtsi
> @@ -28,6 +28,33 @@ audio_clk2: audio2-clk {
> clock-frequency = <0>;
> };
>
> + cluster0_opp: opp-table-0 {
> + compatible = "operating-points-v2";
> + opp-shared;
> +
> + opp-137500000 {
> + opp-hz = /bits/ 64 <137500000>;
> + opp-microvolt = <940000>;
> + clock-latency-ns = <300000>;
> + };
> + opp-275000000 {
> + opp-hz = /bits/ 64 <275000000>;
> + opp-microvolt = <940000>;
> + clock-latency-ns = <300000>;
> + };
> + opp-550000000 {
> + opp-hz = /bits/ 64 <550000000>;
> + opp-microvolt = <940000>;
> + clock-latency-ns = <300000>;
> + };
> + opp-1100000000 {
> + opp-hz = /bits/ 64 <1100000000>;
> + opp-microvolt = <940000>;
> + clock-latency-ns = <300000>;
> + opp-suspend;
> + };
So all voltages are the same. This means the Energy Model (if enabled)
will always pick the operating point with the highest clock rate, just
like on R-Car E3 and RZ/G2E. Apparently that can be fixed by using
"opp-microwatt" instead, but I am still waiting for feedback about
some practical points[1] (yes, the Ebisu-4D is still on my desk for
this reason, and thus unavailable for remote access).
Thanks!
> + };
> +
> cpus {
> #address-cells = <1>;
> #size-cells = <0>;
> @@ -40,6 +67,7 @@ cpu0: cpu@0 {
> next-level-cache = <&L3_CA55>;
> enable-method = "psci";
> clocks = <&cpg CPG_CORE R9A08G045_CLK_I>;
> + operating-points-v2 = <&cluster0_opp>;
> };
>
> L3_CA55: cache-controller-0 {
[1] https://lore.kernel.org/linux-renesas-soc/cover.1728377971.git.geert+renesas@xxxxxxxxx
Gr{oetje,eeting}s,
Geert
--
Geert Uytterhoeven -- There's lots of Linux beyond ia32 -- geert@xxxxxxxxxxxxxx
In personal conversations with technical people, I call myself a hacker. But
when I'm talking to journalists I just say "programmer" or something like that.
-- Linus Torvalds
