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>

2 files changed, 5 insertions, 7 deletions

diff --git a/Documentation/devicetree/bindings/arm/exynos/power_domain.txt b/Documentation/devicetree/bindings/arm/exynos/power_domain.txt
index 6528e215c5fe..843b54622313 100644
--- a/Documentation/devicetree/bindings/arm/exynos/power_domain.txt
+++ b/Documentation/devicetree/bindings/arm/exynos/power_domain.txt
@@ -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 {
diff --git a/arch/arm/mach-exynos/pm_domains.c b/arch/arm/mach-exynos/pm_domains.c
index c0bc83a7663e..d1abc1a94ecd 100644
--- a/arch/arm/mach-exynos/pm_domains.c
+++ b/arch/arm/mach-exynos/pm_domains.c
@@ -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;
 }