linux-kernel - [PATCH/RFC v6 4/7] PM / Domains: Add DT bindings for PM QoS device latencies

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Date:	Mon, 27 Apr 2015 14:43:39 +0200
From:	Geert Uytterhoeven <geert+renesas@...der.be>
To:	"Rafael J. Wysocki" <rjw@...ysocki.net>,
	Kevin Hilman <khilman@...nel.org>,
	Ulf Hansson <ulf.hansson@...aro.org>,
	Axel Haslam <ahaslam@...libre.com>
Cc:	linux-pm@...r.kernel.org, devicetree@...r.kernel.org,
	linux-sh@...r.kernel.org, linux-kernel@...r.kernel.org,
	Geert Uytterhoeven <geert+renesas@...der.be>
Subject: [PATCH/RFC v6 4/7] PM / Domains: Add DT bindings for PM QoS device latencies

PM QoS device start/stop are 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@...der.be>
---
v6:
  - Rebased on top of v4.1-rc1 for new RFC,

v4:
  - Drop save/restore state latencies, as they're Linux driver-specific,
  - Change state to RFC, as this is put on hold,

v3:
  - No changes,

v2:
  - New.
---
 Documentation/devicetree/bindings/power/power_domain.txt | 6 ++++++
 1 file changed, 6 insertions(+)

diff --git a/Documentation/devicetree/bindings/power/power_domain.txt b/Documentation/devicetree/bindings/power/power_domain.txt
index d659e5cb39be6057..32d1d3a399fe2a48 100644
--- a/Documentation/devicetree/bindings/power/power_domain.txt
+++ b/Documentation/devicetree/bindings/power/power_domain.txt
@@ -73,12 +73,18 @@ 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,
+
 Example:
 
 	leaky-device@...50000 {
 		compatible = "foo,i-leak-current";
 		reg = <0x12350000 0x1000>;
 		power-domains = <&power 0>;
+		stop-latency = <250000>;
+		start-latency = <250000>;
 	};
 
 The node above defines a typical PM domain consumer device, which is located
-- 
1.9.1

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