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ARM: EXYNOS: Detect power domain state on registration from DT 

Initial state of power domains might vary on different boards and with
different bootloaders.

This patch adds detection of initial state of power domains when being
registered from DT.

Signed-off-by: Tomasz Figa <t.figa@samsung.com>
Signed-off-by: Kyungmin Park <kyungmin.park@samsung.com>
Signed-off-by: Kukjin Kim <kgene.kim@samsung.com>
This commit is contained in:
Tomasz Figa 2012-11-22 00:21:08 +09:00 committed by Kukjin Kim
parent cf7c397b62
commit 2ed5f23671
2 changed files with 5 additions and 7 deletions
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4
Documentation/devicetree/bindings/arm/exynos/power_domain.txt
View File

@ -9,10 +9,6 @@ Required Properties:
- reg: physical base address of the controller and length of memory mapped
region.
Optional Properties:
- samsung,exynos4210-pd-off: Specifies that the power domain is in turned-off
state during boot and remains to be turned-off until explicitly turned-on.
Example:
lcd0: power-domain-lcd0 {

8
arch/arm/mach-exynos/pm_domains.c
View File

@ -89,6 +89,7 @@ static __init int exynos_pm_dt_parse_domains(void)
for_each_compatible_node(np, NULL, "samsung,exynos4210-pd") {
struct exynos_pm_domain *pd;
int on;
pd = kzalloc(sizeof(*pd), GFP_KERNEL);
if (!pd) {
@ -97,14 +98,15 @@ static __init int exynos_pm_dt_parse_domains(void)
return -ENOMEM;
}
if (of_get_property(np, "samsung,exynos4210-pd-off", NULL))
pd->is_off = true;
pd->name = np->name;
pd->base = of_iomap(np, 0);
pd->pd.power_off = exynos_pd_power_off;
pd->pd.power_on = exynos_pd_power_on;
pd->pd.of_node = np;
pm_genpd_init(&pd->pd, NULL, false);
on = __raw_readl(pd->base + 0x4) & S5P_INT_LOCAL_PWR_EN;
pm_genpd_init(&pd->pd, NULL, !on);
}
return 0;
}