linux-kernel - Re: [RFC PATCH 4/4] dt-bindings: Add support for devices with multiple PM domains

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Date:   Mon, 10 Apr 2017 09:42:42 +0530
From:   Rajendra Nayak <rnayak@...eaurora.org>
To:     Jon Hunter <jonathanh@...dia.com>,
        "Rafael J . Wysocki" <rjw@...ysocki.net>,
        Kevin Hilman <khilman@...nel.org>,
        Ulf Hansson <ulf.hansson@...aro.org>, geert@...ux-m68k.org
Cc:     stanimir.varbanov@...aro.org, sboyd@...eaurora.org,
        Marek Szyprowski <m.szyprowski@...sung.com>,
        linux-pm@...r.kernel.org, linux-kernel@...r.kernel.org,
        linux-tegra@...r.kernel.org
Subject: Re: [RFC PATCH 4/4] dt-bindings: Add support for devices with
 multiple PM domains



On 03/28/2017 07:44 PM, Jon Hunter wrote:
> Now that the generic PM domain framework supports consumers that can
> control multiple PM domains, update the device-tree binding for generic
> PM domains to state that one or more PM domain is permitted for a
> device.
> 
> Signed-off-by: Jon Hunter <jonathanh@...dia.com>
> ---
>  Documentation/devicetree/bindings/power/power_domain.txt | 11 +++++++++--
>  1 file changed, 9 insertions(+), 2 deletions(-)
> 
> diff --git a/Documentation/devicetree/bindings/power/power_domain.txt b/Documentation/devicetree/bindings/power/power_domain.txt
> index 723e1ad937da..fb28d37f9e1f 100644
> --- a/Documentation/devicetree/bindings/power/power_domain.txt
> +++ b/Documentation/devicetree/bindings/power/power_domain.txt
> @@ -20,8 +20,15 @@ Required properties:
>     as specified by device tree binding documentation of particular provider.
>  
>  Optional properties:
> - - power-domains : A phandle and PM domain specifier as defined by bindings of
> -                   the power controller specified by phandle.
> + - power-domains : An array of one or more PM domain specifiers (defined by the
> +		   bindings of the PM domain provider) for each PM domain that
> +		   is required by the device.
> + - power-domain-names: A list of strings of PM domain names. The list must have
> +                       a name for each PM domain specifier in the
> +		       'power-domains' property and these names must be unique
> +		       within the context of this property. The names must be
> +		       indexed so that the first name corresponds to the first
> +		       PM domain specifier and so on.

These bindings are for power-domain providers. We also need to update the bindings
for the consumers (look further down in the same file)

>     Some power domains might be powered from another power domain (or have
>     other hardware specific dependencies). For representing such dependency
>     a standard PM domain consumer binding is used. When provided, all domains
> 

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