linux-kernel - Re: [PATCH v3 02/13] PM / Domains: Add DT bindings for power-on/off latencies

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Message-ID: <CAMuHMdU+4MX-XYe9rHmyPN3=-VQRg+CrnxWEaU2M_Jg+1Psw8A@mail.gmail.com>
Date:	Fri, 26 Sep 2014 19:52:29 +0200
From:	Geert Uytterhoeven <geert@...ux-m68k.org>
To:	Stephen Boyd <sboyd@...eaurora.org>
Cc:	Ulf Hansson <ulf.hansson@...aro.org>,
	Geert Uytterhoeven <geert+renesas@...der.be>,
	"Rafael J. Wysocki" <rjw@...ysocki.net>,
	Simon Horman <horms@...ge.net.au>,
	Magnus Damm <magnus.damm@...il.com>,
	Tomasz Figa <tomasz.figa@...il.com>,
	Philipp Zabel <philipp.zabel@...il.com>,
	Grygorii Strashko <grygorii.strashko@...com>,
	Kevin Hilman <khilman@...aro.org>,
	Linux-sh list <linux-sh@...r.kernel.org>,
	"linux-pm@...r.kernel.org" <linux-pm@...r.kernel.org>,
	"devicetree@...r.kernel.org" <devicetree@...r.kernel.org>,
	"linux-arm-kernel@...ts.infradead.org" 
	<linux-arm-kernel@...ts.infradead.org>,
	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH v3 02/13] PM / Domains: Add DT bindings for power-on/off latencies

Hi Stephen,

On Fri, Sep 26, 2014 at 5:28 PM, Stephen Boyd <sboyd@...eaurora.org> wrote:
>> On 25 September 2014 18:28, Geert Uytterhoeven <geert+renesas@...der.be> wrote:
>> > +Optional properties:
>> > + - power-on-latency: Power-on latency of the PM domain, in ns,
>> > + - power-off-latency: Power-off latency of the PM domain, in ns.
>> > +
>> >  Example:
>> >
>> >         power: power-controller@...40000 {
>> >                 compatible = "foo,power-controller";
>> >                 reg = <0x12340000 0x1000>;
>> >                 #power-domain-cells = <1>;
>> > +               power-on-latency = <250000>;
>> > +               power-off-latency = <250000>;
>
> This assumes every power domain within a power controller has the
> same latencies? That isn't always true. This should be an array
> of values corresponding to the number of power domains if
> #power-domain-cells is 1, or just one value if the cell count is
> 0.

Thanks, you're right. Will update.

However, I'd still like to allow just one value in the #power-domain-cells = <1>
case if the latencies are the same. Is that OK for you?

Thanks again.

Gr{oetje,eeting}s,

                        Geert

--
Geert Uytterhoeven -- There's lots of Linux beyond ia32 -- geert@...ux-m68k.org

In personal conversations with technical people, I call myself a hacker. But
when I'm talking to journalists I just say "programmer" or something like that.
                                -- Linus Torvalds
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