Add bindings for defining a OS-Initiated based CPU PM domain.
Cc: <devicetree@xxxxxxxxxxxxxxx>
Cc: Lorenzo Pieralisi <lorenzo.pieralisi@xxxxxxx>
Cc: Mark Rutland <mark.rutland@xxxxxxx>
Signed-off-by: Lina Iyer <lina.iyer@xxxxxxxxxx>
---
Documentation/devicetree/bindings/arm/psci.txt | 79 ++++++++++++++++++++++++++
1 file changed, 79 insertions(+)
diff --git a/Documentation/devicetree/bindings/arm/psci.txt b/Documentation/devicetree/bindings/arm/psci.txt
index a2c4f1d..63a229b 100644
--- a/Documentation/devicetree/bindings/arm/psci.txt
+++ b/Documentation/devicetree/bindings/arm/psci.txt
@@ -105,7 +105,86 @@ Case 3: PSCI v0.2 and PSCI v0.1.
...
};
+PSCI v1.0 onwards, supports OS-Initiated mode for powering off CPU domains
+from the firmware. Such PM domains for which the PSCI firmware driver acts as
+pseudo-controller, may also be specified in the DT under the psci node. The
+domain definitions must follow the domain idle state specifications per [3].
+The domain states themselves must be compatible with 'arm,idle-state' defined
+in [1] and need to specify the arm,psci-suspend-param property for each idle
+state.
+
+More information on defining CPU PM domains is available in [4].
+
+Example: OS-Iniated PSCI based PM domains with 1 CPU in each domain
+
+ cpus {
+ #address-cells = <1>;
+ #size-cells = <0>;
+
+ CPU0: cpu@0 {
+ device_type = "cpu";
+ compatible = "arm,cortex-a53", "arm,armv8";
+ reg = <0x0>;
+ enable-method = "psci";
+ cpu-idle-states = <&CPU_PWRDN>;
+ power-domains = <&CPU_PD0>;
+ };
+
+ CPU1: cpu@1 {
+ device_type = "cpu";
+ compatible = "arm,cortex-a57", "arm,armv8";
+ reg = <0x100>;
+ enable-method = "psci";
+ cpu-idle-states = <&CPU_PWRDN>;
+ power-domains = <&CPU_PD1>;
+ };
+
+ idle-states {
+ CPU_PWRDN: cpu_power_down{
+ compatible = "arm,idle-state";
+ arm,psci-suspend-param = <0x000001>;
+ entry-latency-us = <10>;
+ exit-latency-us = <10>;
+ min-residency-us = <100>;
+ };
+
+ CLUSTER_RET: domain_ret {
+ compatible = "arm,idle-state";
+ arm,psci-suspend-param = <0x1000010>;
+ entry-latency-us = <500>;
+ exit-latency-us = <500>;
+ min-residency-us = <2000>;
+ };
+
+ CLUSTER_PWR_DWN: domain_gdhs {
+ compatible = "arm,idle-state";
+ arm,psci-suspend-param = <0x1000030>;
+ entry-latency-us = <2000>;
+ exit-latency-us = <2000>;
+ min-residency-us = <6000>;
+ };
+ };
+
+ psci {
+ compatible = "arm,psci-1.0";
+ method = "smc";
+
+ CPU_PD0: cpu-pd@0 {
+ #power-domain-cells = <0>;
+ domain-idle-states = <&CLUSTER_RET>, <&CLUSTER_PWR_DWN>;
+ };
+
+ CPU_PD1: cpu-pd@1 {
+ #power-domain-cells = <0>;
+ domain-idle-states = <&CLUSTER_PWR_DWN>;
+ };
+ };
+
[1] Kernel documentation - ARM idle states bindings
Documentation/devicetree/bindings/arm/idle-states.txt
[2] Power State Coordination Interface (PSCI) specification
http://infocenter.arm.com/help/topic/com.arm.doc.den0022c/DEN0022C_Power_State_Coordination_Interface.pdf
+[3]. PM Domains description
+ Documentation/devicetree/bindings/power/power_domain.txt
+[4]. CPU PM Domains description
+ Documentation/power/cpu_domains.txt
--
2.7.4
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