linux-kernel - Re: [PATCH] arm64: dts: exynos7: add support for cpuidle core power down

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Message-ID: <20141015130218.GB20034@leverpostej>
Date:	Wed, 15 Oct 2014 14:02:18 +0100
From:	Mark Rutland <mark.rutland@....com>
To:	Lorenzo Pieralisi <Lorenzo.Pieralisi@....com>
Cc:	Chander Kashyap <k.chander@...sung.com>,
	"linux-pm@...r.kernel.org" <linux-pm@...r.kernel.org>,
	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
	"linux-samsung-soc@...r.kernel.org" 
	<linux-samsung-soc@...r.kernel.org>,
	"linux-arm-kernel@...ts.infradead.org" 
	<linux-arm-kernel@...ts.infradead.org>,
	"daniel.lezcano@...aro.org" <daniel.lezcano@...aro.org>,
	Catalin Marinas <Catalin.Marinas@....com>,
	"rjw@...ysocki.net" <rjw@...ysocki.net>,
	"kgene.kim@...sung.com" <kgene.kim@...sung.com>
Subject: Re: [PATCH] arm64: dts: exynos7: add support for cpuidle core power
 down

> > +			CPU_SLEEP: cpu-sleep {
> > +				compatible = "arm,idle-state";
> > +				local-timer-stop;
> > +				arm,psci-suspend-param = <0x0010000>;
> > +				entry-latency-us = <20>;
> > +				exit-latency-us = <150>;
> > +				min-residency-us = <2100>;
> > +				status = "enabled";

While status is a relatively standard property, it's absence implies
everything is OK. There no need for it here as-is.

Additionally, the canonical value is "okay", not "enabled", so this
would fail were we to use of_device_is_available in the idle states
parsing.

> status ? This is not a documented property. If you need it please explain
> why, define its bindings and we can see how to accommodate it.

Do we expect that some idle states won't be available on some boards
built from the same platform?

Mark.
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