linux-kernel - Re: [PATCH 5/9] PM / Domains: dt: Allow power-domain property to be a list of phandles

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Date:   Fri, 18 May 2018 12:46:58 +0200
From:   Geert Uytterhoeven <geert@...ux-m68k.org>
To:     Ulf Hansson <ulf.hansson@...aro.org>
Cc:     "Rafael J . Wysocki" <rjw@...ysocki.net>,
        Linux PM list <linux-pm@...r.kernel.org>,
        Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        Jon Hunter <jonathanh@...dia.com>,
        Geert Uytterhoeven <geert+renesas@...der.be>,
        Todor Tomov <todor.tomov@...aro.org>,
        Rajendra Nayak <rnayak@...eaurora.org>,
        Viresh Kumar <viresh.kumar@...aro.org>,
        Vincent Guittot <vincent.guittot@...aro.org>,
        Kevin Hilman <khilman@...nel.org>,
        Linux Kernel Mailing List <linux-kernel@...r.kernel.org>,
        Linux ARM <linux-arm-kernel@...ts.infradead.org>,
        linux-tegra@...r.kernel.org, Rob Herring <robh+dt@...nel.org>,
        "open list:OPEN FIRMWARE AND FLATTENED DEVICE TREE BINDINGS" 
        <devicetree@...r.kernel.org>
Subject: Re: [PATCH 5/9] PM / Domains: dt: Allow power-domain property to be a
 list of phandles

Hi Ulf,

On Fri, May 18, 2018 at 12:31 PM, Ulf Hansson <ulf.hansson@...aro.org> wrote:
> To be able to describe topologies where devices are partitioned across
> multiple power domains, let's extend the power-domain property to allow
> being a list of phandles.
>
> Cc: Rob Herring <robh+dt@...nel.org>
> Cc: devicetree@...r.kernel.org
> Suggested-by: Jon Hunter <jonathanh@...dia.com>
> Signed-off-by: Ulf Hansson <ulf.hansson@...aro.org>

Thanks for your patch!

> --- a/Documentation/devicetree/bindings/power/power_domain.txt
> +++ b/Documentation/devicetree/bindings/power/power_domain.txt
> @@ -111,8 +111,9 @@ Example 3:
>  ==PM domain consumers==
>
>  Required properties:
> - - power-domains : A phandle and PM domain specifier as defined by bindings of
> -                   the power controller specified by phandle.
> + - power-domains : A phandle and PM domain specifier, or a list of phandles, as

A list of PM domain specifiers?

(A PM domain specifier consists of a phandle, and zero or more indices)

> +                  defined by bindings of the power controller specified by
> +                  phandle.
>
>  Example:
>
> @@ -122,9 +123,16 @@ Example:
>                 power-domains = <&power 0>;
>         };
>
> -The node above defines a typical PM domain consumer device, which is located
> -inside a PM domain with index 0 of a power controller represented by a node
> -with the label "power".
> +       leaky-device@...50000 {

I know it's just an example, but this uses the same unit-address and
reg property
as the device node above.

There's a similar issue with the two other examples below, but they
use different
node names (leaky-device0 and leaky-device1).

> +               compatible = "foo,i-leak-current";
> +               reg = <0x12350000 0x1000>;
> +               power-domains = <&power0 0>, <&power1 0> ;
> +       };
> +
> +The first example above defines a typical PM domain consumer device, which is
> +located inside a PM domain with index 0 of a power controller represented by a
> +node with the label "power". In the second example the consumer device are
> +partitioned across two PM domains.
>
>  Optional properties:
>  - required-opps: This contains phandle to an OPP node in another device's OPP

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