On 14 January 2015 at 15:12, Marek Szyprowski <m.szyprowski@xxxxxxxxxxx> wrote:
> This patch adds a note on defining subdomains to generic PM domain
> binding documentation to let power domain providers use common approach
> for defining power domain hierarchy.
>
> Signed-off-by: Marek Szyprowski <m.szyprowski@xxxxxxxxxxx>
Reviewed-by: Ulf Hansson <ulf.hansson@xxxxxxxxxx>
Kind regards
Uffe
> ---
> RESEND version:
> - fixed spelling mistakes, thanks go to Geert!
> ---
> .../devicetree/bindings/power/power_domain.txt | 29 ++++++++++++++++++++++
> 1 file changed, 29 insertions(+)
>
> diff --git a/Documentation/devicetree/bindings/power/power_domain.txt b/Documentation/devicetree/bindings/power/power_domain.txt
> index 98c1667..eeea45b 100644
> --- a/Documentation/devicetree/bindings/power/power_domain.txt
> +++ b/Documentation/devicetree/bindings/power/power_domain.txt
> @@ -19,6 +19,16 @@ Required properties:
> providing multiple PM domains (e.g. power controllers), but can be any value
> 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.
> + 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
> + created by the given provider should be subdomains of the domain
> + specified by this binding. More details about power domain specifier are
> + available in the next section.
> +
> Example:
>
> power: power-controller@12340000 {
> @@ -30,6 +40,25 @@ Example:
> The node above defines a power controller that is a PM domain provider and
> expects one cell as its phandle argument.
>
> +Example 2:
> +
> + parent: power-controller@12340000 {
> + compatible = "foo,power-controller";
> + reg = <0x12340000 0x1000>;
> + #power-domain-cells = <1>;
> + };
> +
> + child: power-controller@12340000 {
> + compatible = "foo,power-controller";
> + reg = <0x12341000 0x1000>;
> + power-domains = <&parent 0>;
> + #power-domain-cells = <1>;
> + };
> +
> +The nodes above define two power controllers: 'parent' and 'child'.
> +Domains created by the 'child' power controller are subdomains of '0' power
> +domain provided by the 'parent' power controller.
> +
> ==PM domain consumers==
>
> Required properties:
> --
> 1.9.2
>
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