On Tue, Nov 25, 2014 at 1:29 PM, Ulf Hansson <ulf.hansson@xxxxxxxxxx> wrote:
> 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.
I am not sure if this is generic. I guess PD's represented like below
are more generic.
PD1 {
PD2 {
PD3 {
};
};
};
>
> So, maybe we can add this as a common DT binding for the generic PM
> domain instead of having it as Exynos specific?
Yes sure.
Regards,
Amit D
>
> Kind regards
> Uffe
>
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