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

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Date:	Tue, 16 Sep 2014 20:48:49 +0200
From:	Geert Uytterhoeven <geert+renesas@...der.be>
To:	"Rafael J. Wysocki" <rjw@...ysocki.net>,
	Len Brown <len.brown@...el.com>, Pavel Machek <pavel@....cz>,
	Simon Horman <horms@...ge.net.au>,
	Magnus Damm <magnus.damm@...il.com>,
	Rob Herring <robh+dt@...nel.org>,
	Pawel Moll <pawel.moll@....com>,
	Mark Rutland <mark.rutland@....com>,
	Ian Campbell <ijc+devicetree@...lion.org.uk>,
	Kumar Gala <galak@...eaurora.org>
Cc:	Ulf Hansson <ulf.hansson@...aro.org>,
	Tomasz Figa <tomasz.figa@...il.com>,
	Philipp Zabel <philipp.zabel@...il.com>,
	Grygorii Strashko <grygorii.strashko@...com>,
	Kevin Hilman <khilman@...aro.org>, linux-pm@...r.kernel.org,
	devicetree@...r.kernel.org, linux-sh@...r.kernel.org,
	linux-arm-kernel@...ts.infradead.org, linux-kernel@...r.kernel.org,
	Geert Uytterhoeven <geert+renesas@...der.be>
Subject: [PATCH/RFC v2 02/12] PM / Domains: Add DT bindings for PM QoS device latencies

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@...der.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@...50000 {
 		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

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