linux-kernel - Re: [PATCH RFC v2 08/12] soc: samsung: pm_domain: Add support for parent power domain

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Date:	Tue, 25 Nov 2014 08:59:29 +0100
From:	Ulf Hansson <ulf.hansson@...aro.org>
To:	Amit Daniel Kachhap <amit.daniel@...sung.com>
Cc:	"linux-arm-kernel@...ts.infradead.org" 
	<linux-arm-kernel@...ts.infradead.org>,
	linux-samsung-soc <linux-samsung-soc@...r.kernel.org>,
	Kukjin Kim <kgene.kim@...sung.com>,
	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
	Sylwester Nawrocki <s.nawrocki@...sung.com>,
	pankaj.dubey@...sung.com, Kevin Hilman <khilman@...nel.org>,
	"linux-pm@...r.kernel.org" <linux-pm@...r.kernel.org>,
	Geert Uytterhoeven <geert@...ux-m68k.org>,
	"Rafael J. Wysocki" <rjw@...ysocki.net>,
	"devicetree@...r.kernel.org" <devicetree@...r.kernel.org>
Subject: Re: [PATCH RFC v2 08/12] soc: samsung: pm_domain: Add support for
 parent power domain

On 24 November 2014 at 14:04, Amit Daniel Kachhap
<amit.daniel@...sung.com> 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@...sung.com>
> Signed-off-by: Amit Daniel Kachhap <amit.daniel@...sung.com>
> ---
>  .../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@...44060 {
>                 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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