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Commit 0f780751 authored by Marek Szyprowski's avatar Marek Szyprowski Committed by Kukjin Kim
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ARM: EXYNOS: add support for sub-power domains 



This patch adds support for making one power domain a sub-domain of
other domain. This is useful for modeling power dependences for devices
like TV Mixer or Camera ISP, which needs to have more than one power
domain enabled to be operational.

Based on previous work by Amit Daniel Kachhap <amit.daniel@samsung.com>.

Signed-off-by: default avatarMarek Szyprowski <m.szyprowski@samsung.com>
Reviewed-by: default avatarUlf Hansson <ulf.hansson@linaro.org>
Signed-off-by: default avatarKukjin Kim <kgene@kernel.org>
parent dbe67543

Documentation/devicetree/bindings/arm/exynos/power_domain.txt

+2 −0
Original line number Diff line number Diff line
@@ -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.

- power-domains: phandle pointing to the parent power domain, for more details

		 see Documentation/devicetree/bindings/power/power_domain.txt



Node of a device using power domains must have a power-domains property

defined with a phandle to respective power domain.

arch/arm/mach-exynos/pm_domains.c

+28 −0
Original line number Diff line number Diff line
@@ -161,6 +161,34 @@ static __init int exynos4_pm_init_power_domain(void) 
		of_genpd_add_provider_simple(np, &pd->pd);

	}



	/* Assign the child power domains to their parents */

	for_each_compatible_node(np, NULL, "samsung,exynos4210-pd") {

		struct generic_pm_domain *child_domain, *parent_domain;

		struct of_phandle_args args;



		args.np = np;

		args.args_count = 0;

		child_domain = of_genpd_get_from_provider(&args);

		if (!child_domain)

			continue;



		if (of_parse_phandle_with_args(np, "power-domains",

					 "#power-domain-cells", 0, &args) != 0)

			continue;



		parent_domain = of_genpd_get_from_provider(&args);

		if (!parent_domain)

			continue;



		if (pm_genpd_add_subdomain(parent_domain, child_domain))

			pr_warn("%s failed to add subdomain: %s\n",

				parent_domain->name, child_domain->name);

		else

			pr_info("%s has as child subdomain: %s.\n",

				parent_domain->name, child_domain->name);

		of_node_put(np);

	}



	return 0;

}

arch_initcall(exynos4_pm_init_power_domain);