[PATCH 1/5] arm64: dts: r8a7795: Add cpuidle support for CA57 cores

[Ulrich Hecht <uli+renesas@fpond.eu>]

From: Khiem Nguyen <khiem.nguyen.xt@rvc.renesas.com>

Enable cpuidle (core shutdown) support for R-Car H3 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>
[dien.pham.ry: Apply new cpuidle parameters]
Signed-off-by: Dien Pham <dien.pham.ry@renesas.com>
Signed-off-by: Takeshi Kihara <takeshi.kihara.df@renesas.com>
Signed-off-by: Ulrich Hecht <uli+renesas@fpond.eu>
---
 arch/arm64/boot/dts/renesas/r8a7795.dtsi | 18 ++++++++++++++++++
 1 file changed, 18 insertions(+)

diff --git a/arch/arm64/boot/dts/renesas/r8a7795.dtsi b/arch/arm64/boot/dts/renesas/r8a7795.dtsi
index efc2477..64ab88a 100644
--- a/arch/arm64/boot/dts/renesas/r8a7795.dtsi
+++ b/arch/arm64/boot/dts/renesas/r8a7795.dtsi
@@ -123,6 +123,7 @@
 			power-domains = <&sysc R8A7795_PD_CA57_CPU0>;
 			next-level-cache = <&L2_CA57>;
 			enable-method = "psci";
+			cpu-idle-states = <&CPU_SLEEP_0>;
 			clocks =<&cpg CPG_CORE R8A7795_CLK_Z>;
 			operating-points-v2 = <&cluster0_opp>;
 			#cooling-cells = <2>;
@@ -135,6 +136,7 @@
 			power-domains = <&sysc R8A7795_PD_CA57_CPU1>;
 			next-level-cache = <&L2_CA57>;
 			enable-method = "psci";
+			cpu-idle-states = <&CPU_SLEEP_0>;
 			clocks =<&cpg CPG_CORE R8A7795_CLK_Z>;
 			operating-points-v2 = <&cluster0_opp>;
 			#cooling-cells = <2>;
@@ -147,6 +149,7 @@
 			power-domains = <&sysc R8A7795_PD_CA57_CPU2>;
 			next-level-cache = <&L2_CA57>;
 			enable-method = "psci";
+			cpu-idle-states = <&CPU_SLEEP_0>;
 			clocks =<&cpg CPG_CORE R8A7795_CLK_Z>;
 			operating-points-v2 = <&cluster0_opp>;
 			#cooling-cells = <2>;
@@ -159,6 +162,7 @@
 			power-domains = <&sysc R8A7795_PD_CA57_CPU3>;
 			next-level-cache = <&L2_CA57>;
 			enable-method = "psci";
+			cpu-idle-states = <&CPU_SLEEP_0>;
 			clocks =<&cpg CPG_CORE R8A7795_CLK_Z>;
 			operating-points-v2 = <&cluster0_opp>;
 			#cooling-cells = <2>;
@@ -221,6 +225,20 @@
 			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>;
+				status = "okay";
+			};
+		};
 	};
 
 	extal_clk: extal {
-- 
2.7.4