linux-kernel - Re: [PATCH v2 2/7] ARM: Exynos: add support for sub-power domains

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Date:	Wed, 3 Dec 2014 13:36:44 +0100
From:	Geert Uytterhoeven <geert@...ux-m68k.org>
To:	Marek Szyprowski <m.szyprowski@...sung.com>
Cc:	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
	"linux-arm-kernel@...ts.infradead.org" 
	<linux-arm-kernel@...ts.infradead.org>,
	"linux-samsung-soc@...r.kernel.org" 
	<linux-samsung-soc@...r.kernel.org>, Kukjin Kim <kgene@...nel.org>,
	Inki Dae <inki.dae@...sung.com>,
	Tobias Jakobi <Liquid.Acid@....net>,
	Daniel Drake <drake@...lessm.com>,
	Andrzej Hajda <a.hajda@...sung.com>,
	Tomasz Figa <tomasz.figa@...il.com>,
	Pankaj Dubey <pankaj.dubey@...sung.com>,
	Amit Daniel Kachhap <amit.daniel@...sung.com>,
	Ulf Hansson <ulf.hansson@...aro.org>
Subject: Re: [PATCH v2 2/7] ARM: Exynos: add support for sub-power domains

Hi Marek,

On Wed, Dec 3, 2014 at 1:33 PM, Marek Szyprowski
<m.szyprowski@...sung.com> wrote:
> diff --git a/Documentation/devicetree/bindings/arm/exynos/power_domain.txt b/Documentation/devicetree/bindings/arm/exynos/power_domain.txt
> index abde1ea8a119..b884358ebb1a 100644
> --- a/Documentation/devicetree/bindings/arm/exynos/power_domain.txt
> +++ b/Documentation/devicetree/bindings/arm/exynos/power_domain.txt
> @@ -22,6 +22,8 @@ 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.
> +- samsung,power-domain: phandle to a master power domain that the given domain
> +                      is a part of

For new DTSes I'd recommend using the generic "power-domains" only.

Or do you already have a DTS where tv-power-domain@...23C20 uses
"samsung,power-domain" in the wild?

>  Node of a device using power domains must have a samsung,power-domain property
>  defined with a phandle to respective power domain.
> diff --git a/arch/arm/mach-exynos/pm_domains.c b/arch/arm/mach-exynos/pm_domains.c
> index 20f267121b3e..fa9a47ddad81 100644
> --- a/arch/arm/mach-exynos/pm_domains.c
> +++ b/arch/arm/mach-exynos/pm_domains.c
> @@ -108,7 +108,7 @@ static int exynos_pd_power_off(struct generic_pm_domain *domain)
>  static __init int exynos4_pm_init_power_domain(void)
>  {
>         struct platform_device *pdev;
> -       struct device_node *np;
> +       struct device_node *np, *master_np;
>
>         for_each_compatible_node(np, NULL, "samsung,exynos4210-pd") {
>                 struct exynos_pm_domain *pd;
> @@ -159,6 +159,15 @@ no_clk:
>
>                 pm_genpd_init(&pd->pd, NULL, !on);
>                 of_genpd_add_provider_simple(np, &pd->pd);
> +
> +               /* make master and slave hierarchy */
> +               master_np = of_parse_phandle(np, "samsung,power-domain", 0);
> +               if (!master_np)
> +                       master_np = of_parse_phandle(np, "power-domains", 0);
> +               if (master_np) {
> +                       pm_genpd_add_subdomain_names(master_np->name, np->name);
> +                       of_node_put(master_np);
> +               }




-- 
Gr{oetje,eeting}s,

                        Geert

--
Geert Uytterhoeven -- There's lots of Linux beyond ia32 -- geert@...ux-m68k.org

In personal conversations with technical people, I call myself a hacker. But
when I'm talking to journalists I just say "programmer" or something like that.
                                -- Linus Torvalds
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