Re-using idle state definition provided by arm,idle-state for domain
idle states creates a lot of confusion and limits further evolution of
the domain idle definition. To keep things clear and simple, define a
idle states for domain using a new compatible "domain-idle-state".
Fix existing PM domains code to look for the newly defined compatible.
Cc: <devicetree@xxxxxxxxxxxxxxx>
Cc: Rob Herring <robh@xxxxxxxxxx>
Signed-off-by: Lina Iyer <lina.iyer@xxxxxxxxxx>
---
.../bindings/power/domain-idle-state.txt | 33 ++++++++++++++++++++++
.../devicetree/bindings/power/power_domain.txt | 8 +++---
drivers/base/power/domain.c | 2 +-
3 files changed, 38 insertions(+), 5 deletions(-)
create mode 100644 Documentation/devicetree/bindings/power/domain-idle-state.txt
diff --git a/Documentation/devicetree/bindings/power/domain-idle-state.txt b/Documentation/devicetree/bindings/power/domain-idle-state.txt
new file mode 100644
index 0000000..eefc7ed
--- /dev/null
+++ b/Documentation/devicetree/bindings/power/domain-idle-state.txt
@@ -0,0 +1,33 @@
+PM Domain Idle State Node:
+
+A domain idle state node represents the state parameters that will be used to
+select the state when there are no active components in the domain.
+
+The state node has the following parameters -
+
+- compatible:
+ Usage: Required
+ Value type: <string>
+ Definition: Must be "domain-idle-state".
+
+- entry-latency-us
+ Usage: Required
+ Value type: <prop-encoded-array>
+ Definition: u32 value representing worst case latency in
+ microseconds required to enter the idle state.
+ The exit-latency-us duration may be guaranteed
+ only after entry-latency-us has passed.
+
+- exit-latency-us
+ Usage: Required
+ Value type: <prop-encoded-array>
+ Definition: u32 value representing worst case latency
+ in microseconds required to exit the idle state.
+
+- min-residency-us
+ Usage: Required
+ Value type: <prop-encoded-array>
+ Definition: u32 value representing minimum residency duration
+ in microseconds after which the idle state will yield
+ power benefits after overcoming the overhead in entering
+i the idle state.
diff --git a/Documentation/devicetree/bindings/power/power_domain.txt b/Documentation/devicetree/bindings/power/power_domain.txt
index e165036..723e1ad 100644
--- a/Documentation/devicetree/bindings/power/power_domain.txt
+++ b/Documentation/devicetree/bindings/power/power_domain.txt
@@ -31,7 +31,7 @@ Optional properties:
- domain-idle-states : A phandle of an idle-state that shall be soaked into a
generic domain power state. The idle state definitions are
- compatible with arm,idle-state specified in [1].
+ compatible with domain-idle-state specified in [1].
The domain-idle-state property reflects the idle state of this PM domain and
not the idle states of the devices or sub-domains in the PM domain. Devices
and sub-domains have their own idle-states independent of the parent
@@ -85,7 +85,7 @@ Example 3:
};
DOMAIN_RET: state@0 {
- compatible = "arm,idle-state";
+ compatible = "domain-idle-state";
reg = <0x0>;
entry-latency-us = <1000>;
exit-latency-us = <2000>;
@@ -93,7 +93,7 @@ Example 3:
};
DOMAIN_PWR_DN: state@1 {
- compatible = "arm,idle-state";
+ compatible = "domain-idle-state";
reg = <0x1>;
entry-latency-us = <5000>;
exit-latency-us = <8000>;
@@ -118,4 +118,4 @@ The node above defines a typical PM domain consumer device, which is located
inside a PM domain with index 0 of a power controller represented by a node
with the label "power".
-[1]. Documentation/devicetree/bindings/arm/idle-states.txt
+[1]. Documentation/devicetree/bindings/power/domain-idle-state.txt
diff --git a/drivers/base/power/domain.c b/drivers/base/power/domain.c
index 661737c..f0bc672 100644
--- a/drivers/base/power/domain.c
+++ b/drivers/base/power/domain.c
@@ -2048,7 +2048,7 @@ int genpd_dev_pm_attach(struct device *dev)
EXPORT_SYMBOL_GPL(genpd_dev_pm_attach);
static const struct of_device_id idle_state_match[] = {
- { .compatible = "arm,idle-state", },
+ { .compatible = "domain-idle-state", },
{ }
};
--
2.7.4
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