arm64: dts: r8a7796: Add cpuidle support for CA57 cores

Enable cpuidle (core shutdown) support for R-Car M3-W CA57 cores.

Parameters were found after evaluation by gaku.inami.xw@bp.renesas.com; they
help to keep the performance and reduce the power consumption.

Signed-off-by: Khiem Nguyen <khiem.nguyen.xt@rvc.renesas.com>
Signed-off-by: Takeshi Kihara <takeshi.kihara.df@renesas.com>
[dien.pham.ry: Apply new cpuidle parameters]
Signed-off-by: Dien Pham <dien.pham.ry@renesas.com>
Signed-off-by: Ulrich Hecht <uli+renesas@fpond.eu>
Link: https://lore.kernel.org/r/1547808474-19427-4-git-send-email-uli+renesas@fpond.eu
Signed-off-by: Geert Uytterhoeven <geert+renesas@glider.be>

diff --git a/arch/arm64/boot/dts/renesas/r8a7796.dtsi b/arch/arm64/boot/dts/renesas/r8a7796.dtsi
index 8c9bf98..6e6cf7d 100644 (file)
--- a/arch/arm64/boot/dts/renesas/r8a7796.dtsi
+++ b/arch/arm64/boot/dts/renesas/r8a7796.dtsi
@@ -160,6 +160,7 @@
                        power-domains = <&sysc R8A7796_PD_CA57_CPU0>;
                        next-level-cache = <&L2_CA57>;
                        enable-method = "psci";
+                       cpu-idle-states = <&CPU_SLEEP_0>;
                        dynamic-power-coefficient = <854>;
                        clocks = <&cpg CPG_CORE R8A7796_CLK_Z>;
                        operating-points-v2 = <&cluster0_opp>;
@@ -174,6 +175,7 @@
                        power-domains = <&sysc R8A7796_PD_CA57_CPU1>;
                        next-level-cache = <&L2_CA57>;
                        enable-method = "psci";
+                       cpu-idle-states = <&CPU_SLEEP_0>;
                        clocks = <&cpg CPG_CORE R8A7796_CLK_Z>;
                        operating-points-v2 = <&cluster0_opp>;
                        capacity-dmips-mhz = <1024>;
@@ -243,6 +245,19 @@
                        cache-unified;
                        cache-level = <2>;
                };
+
+               idle-states {
+                       entry-method = "psci";
+
+                       CPU_SLEEP_0: cpu-sleep-0 {
+                               compatible = "arm,idle-state";
+                               arm,psci-suspend-param = <0x0010000>;
+                               local-timer-stop;
+                               entry-latency-us = <400>;
+                               exit-latency-us = <500>;
+                               min-residency-us = <4000>;
+                       };
+               };
        };
 
        extal_clk: extal {