On 24 November 2014 at 14:04, Amit Daniel Kachhap
<amit.daniel@xxxxxxxxxxx> wrote:
> This patch adds supports for parent power domain. This will ensure
> invoking of parent/child power domain on/off in a correct sequence.
> In exynos7 SOC's, power domain controllers have parent and child
> hierarchy.
>
> Cc: Kukjin Kim <kgene.kim@xxxxxxxxxxx>
> Signed-off-by: Amit Daniel Kachhap <amit.daniel@xxxxxxxxxxx>
> ---
> .../bindings/arm/exynos/power_domain.txt | 2 +
> drivers/soc/samsung/pm_domains.c | 43 +++++++++++++++++++-
> 2 files changed, 44 insertions(+), 1 deletion(-)
>
> diff --git a/Documentation/devicetree/bindings/arm/exynos/power_domain.txt b/Documentation/devicetree/bindings/arm/exynos/power_domain.txt
> index 00ebda1..0160bdc 100644
> --- a/Documentation/devicetree/bindings/arm/exynos/power_domain.txt
> +++ b/Documentation/devicetree/bindings/arm/exynos/power_domain.txt
> @@ -24,6 +24,7 @@ Optional Properties:
> - pclkN, clkN: Pairs of parent of input clock and input clock to the
> devices in this power domain. Maximum of 4 pairs (N = 0 to 3)
> are supported currently.
> +- parents: phandle of parent power domains.
>
> Node of a device using power domains must have a samsung,power-domain property
> defined with a phandle to respective power domain.
> @@ -48,6 +49,7 @@ Example:
> mfc_pd: power-domain@10044060 {
> compatible = "samsung,exynos4210-pd", "samsung,exynos7-pd-mfc";
> reg = <0x10044060 0x20>;
> + parents = <&pd_top>;
> #power-domain-cells = <0>;
> };
This seems like a good and generic approach to describe that a PM
domain could have a parent. I would suggest to rename it, such it
reflects its a PM domain binding though.
So, maybe we can add this as a common DT binding for the generic PM
domain instead of having it as Exynos specific?
Kind regards
Uffe
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