ARM: EXYNOS: implement pm_power_off for EXYNOS5440

[Jungseok Lee <jays.lee@samsung.com>]

This patch implements pm_power_off function since a power-down
control register should be set in order to turn off EXYNOS5440.
Otherwise, power domains remain alive despite "poweroff" action.

Signed-off-by: Jungseok Lee <jays.lee@samsung.com>
---
 arch/arm/mach-exynos/common.c |   17 +++++++++++++++--
 1 file changed, 15 insertions(+), 2 deletions(-)

diff --git a/arch/arm/mach-exynos/common.c b/arch/arm/mach-exynos/common.c
index ba95e5d..21f3ce9 100644
--- a/arch/arm/mach-exynos/common.c
+++ b/arch/arm/mach-exynos/common.c
@@ -294,11 +294,24 @@ void exynos5_restart(enum reboot_mode mode, const char *cmd)
 	__raw_writel(val, addr);
 }
 
+static void exynos5440_power_off(void)
+{
+	struct device_node *np;
+	void __iomem *addr;
+
+	np = of_find_compatible_node(NULL, NULL, "samsung,exynos5440-clock");
+
+	addr = of_iomap(np, 0) + 0x14;
+
+	__raw_writel(0x1, addr);
+}
+
 void __init exynos_init_late(void)
 {
-	if (of_machine_is_compatible("samsung,exynos5440"))
-		/* to be supported later */
+	if (of_machine_is_compatible("samsung,exynos5440")) {
+		pm_power_off = exynos5440_power_off;
 		return;
+	}
 
 	exynos_pm_late_initcall();
 }
-- 
1.7.10.4