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authorMarek Szyprowski <m.szyprowski@samsung.com>2015-02-04 23:44:15 +0900
committerKukjin Kim <kgene@kernel.org>2015-02-27 05:26:57 +0900
commit0f7807518fe172353622700123615ae19701e693 (patch)
tree30e319a6047556d6a18cede62e71fb76cc26abb5 /arch/arm/mach-exynos
parentdbe675433df3966cb4d24e80670a3134ab8757ee (diff)
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: Marek Szyprowski <m.szyprowski@samsung.com> Reviewed-by: Ulf Hansson <ulf.hansson@linaro.org> Signed-off-by: Kukjin Kim <kgene@kernel.org>
Diffstat (limited to 'arch/arm/mach-exynos')
-rw-r--r--arch/arm/mach-exynos/pm_domains.c28
1 files changed, 28 insertions, 0 deletions
diff --git a/arch/arm/mach-exynos/pm_domains.c b/arch/arm/mach-exynos/pm_domains.c
index 20f267121b3e..37266a826437 100644
--- a/arch/arm/mach-exynos/pm_domains.c
+++ b/arch/arm/mach-exynos/pm_domains.c
@@ -161,6 +161,34 @@ no_clk:
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);