[PATCH 4/7] Exynos: add support for 'domain-always-on' property

[Marek Szyprowski]

This patch adds support for domain-always-on property to Exynos power
domain driver. Domains with this property as always kept enabled.

Signed-off-by: Marek Szyprowski <m.szyprowski at samsung.com>
---
 Documentation/devicetree/bindings/arm/exynos/power_domain.txt | 2 ++
 arch/arm/mach-exynos/pm_domains.c                             | 6 +++++-
 2 files changed, 7 insertions(+), 1 deletion(-)

diff --git a/Documentation/devicetree/bindings/arm/exynos/power_domain.txt 
b/Documentation/devicetree/bindings/arm/exynos/power_domain.txt
index 5216b419016a..b25d9b1ce471 100644
--- a/Documentation/devicetree/bindings/arm/exynos/power_domain.txt
+++ b/Documentation/devicetree/bindings/arm/exynos/power_domain.txt
@@ -8,6 +8,8 @@ Required Properties:
     * samsung,exynos4210-pd - for exynos4210 type power domain.
 - reg: physical base address of the controller and length of memory mapped
     region.
+Optional properties:
+- domain-always-on:    keeps the domain always enabled

 Node of a device using power domains must have a samsung,power-domain property
 defined with a phandle to respective power domain.
diff --git a/arch/arm/mach-exynos/pm_domains.c 
b/arch/arm/mach-exynos/pm_domains.c
index fe6570ebbdde..279b008de02f 100644
--- a/arch/arm/mach-exynos/pm_domains.c
+++ b/arch/arm/mach-exynos/pm_domains.c
@@ -151,6 +151,7 @@ static __init int exynos4_pm_init_power_domain(void)
        struct device_node *np;

        for_each_compatible_node(np, NULL, "samsung,exynos4210-pd") {
+               struct dev_power_governor *gov = NULL;
                struct exynos_pm_domain *pd;
                int on;

@@ -163,6 +164,9 @@ static __init int exynos4_pm_init_power_domain(void)
                        return -ENOMEM;
                }

+               if (of_property_read_bool(np, "domain-always-on"))
+                       gov = &pm_domain_always_on_gov;
+
                pd->pd.name = kstrdup(np->name, GFP_KERNEL);
                pd->name = pd->pd.name;
                pd->base = of_iomap(np, 0);
@@ -174,7 +178,7 @@ static __init int exynos4_pm_init_power_domain(void)

                on = __raw_readl(pd->base + 0x4) & S5P_INT_LOCAL_PWR_EN;

-               pm_genpd_init(&pd->pd, NULL, !on);
+               pm_genpd_init(&pd->pd, gov, !on);
        }

        bus_register_notifier(&platform_bus_type, &platform_nb);
-- 
1.9.2