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>
This commit is contained in:
Marek Szyprowski 2015-02-04 23:44:15 +09:00 коммит произвёл Kukjin Kim
Родитель dbe675433d
Коммит 0f7807518f
2 изменённых файлов: 30 добавлений и 0 удалений

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@ -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.

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@ -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);