Add idle states properties for generic ARM CPU idle driver. This
includes a C7 state which is the power down state of CPU cores.

Signed-off-by: Joseph Lo <redacted>
---
Note:
This dt patch depends on the DT changes in below series.
http://patchwork.ozlabs.org/project/linux-tegra/list/?series=84380
---
 arch/arm64/boot/dts/nvidia/tegra210.dtsi | 17 +++++++++++++++++
 1 file changed, 17 insertions(+)

diff --git a/arch/arm64/boot/dts/nvidia/tegra210.dtsi b/arch/arm64/boot/dts/nvidia/tegra210.dtsi
index 143bd103c923..b583d3065946 100644
--- a/arch/arm64/boot/dts/nvidia/tegra210.dtsi
+++ b/arch/arm64/boot/dts/nvidia/tegra210.dtsi

@@ -1308,24 +1308,41 @@
 				 <&dfll>;
 			clock-names = "cpu_g", "pll_x", "pll_p", "dfll";
 			clock-latency = <300000>;
+			cpu-idle-states = <&C7>;
 		};
 
 		cpu@1 {
 			device_type = "cpu";
 			compatible = "arm,cortex-a57";
 			reg = <1>;
+			cpu-idle-states = <&C7>;
 		};
 
 		cpu@2 {
 			device_type = "cpu";
 			compatible = "arm,cortex-a57";
 			reg = <2>;
+			cpu-idle-states = <&C7>;
 		};
 
 		cpu@3 {
 			device_type = "cpu";
 			compatible = "arm,cortex-a57";
 			reg = <3>;
+			cpu-idle-states = <&C7>;
+		};
+
+		idle-states {
+			entry-method = "psci";
+
+			C7: c7 {
+				compatible = "arm,idle-state";
+				arm,psci-suspend-param = <0x40000007>;
+				wakeup-latency-us = <130>;
+				min-residency-us = <1000>;
+				idle-state-name = "c7-cpu-powergated";
+				status = "disabled";
+			};
 		};
 	};