[PATCH/RFC v2 02/12] PM / Domains: Add DT bindings for PM QoS device latencies

[Geert Uytterhoeven <geert+renesas@glider.be>]

PM QoS device start/stop and save/restore state latencies are more or
less properties of the hardware.
In legacy code, they're specified from platform code.
On DT platforms, their values should come from DT.

Signed-off-by: Geert Uytterhoeven <geert+renesas@glider.be>
---
Should these properties be called "linux,*-latency"?

v2:
  - New
---
 Documentation/devicetree/bindings/power/power_domain.txt | 10 ++++++++++
 1 file changed, 10 insertions(+)

diff --git a/Documentation/devicetree/bindings/power/power_domain.txt b/Documentation/devicetree/bindings/power/power_domain.txt
index 7bc421d84367d636..024815bc257723b1 100644
--- a/Documentation/devicetree/bindings/power/power_domain.txt
+++ b/Documentation/devicetree/bindings/power/power_domain.txt
@@ -42,12 +42,22 @@ Required properties:
  - power-domains : A phandle and PM domain specifier as defined by bindings of
                    the power controller specified by phandle.
 
+Optional properties:
+ - stop-latency: Stop latency of the device, in ns,
+ - start-latency: Start latency of the device, in ns,
+ - save-state-latency: Save-state latency of the device, in ns,
+ - restore-state-latency: Restore-state latency of the device, in ns.
+
 Example:
 
 	leaky-device@12350000 {
 		compatible = "foo,i-leak-current";
 		reg = <0x12350000 0x1000>;
 		power-domains = <&power 0>;
+		stop-latency = <250000>;
+		start-latency = <250000>;
+		save-state-latency = <250000>;
+		restore-state-latency = <250000>;
 	};
 
 The node above defines a typical PM domain consumer device, which is located
-- 
1.9.1