ARM: EXYNOS: add support for async-bridge clocks for pm_domains

Since Exynos5420 there are async-bridges (ASB) between different IPs. These
bridges must be operational during power domain on/off, ie. clocks used
by these bridges should be enabled.
This patch enabled these clocks during domain on/off.

Signed-off-by: Andrzej Hajda <a.hajda@samsung.com>
Reviewed-by: Javier Martinez Canillas <javier.martinez@collabora.co.uk>
Tested-by: Javier Martinez Canillas <javier.martinez@collabora.co.uk>
Reviewed-by: Sylwester Nawrocki <s.nawrocki@samsung.com>
Signed-off-by: Kukjin Kim <kgene@kernel.org>

1 files changed, 23 insertions, 4 deletions

diff --git a/arch/arm/mach-exynos/pm_domains.c b/arch/arm/mach-exynos/pm_domains.c
index 20f267121b3e..ccdcacbd1cd9 100644
--- a/arch/arm/mach-exynos/pm_domains.c
+++ b/arch/arm/mach-exynos/pm_domains.c
@@ -37,6 +37,7 @@ struct exynos_pm_domain {
         struct clk *oscclk;
         struct clk *clk[MAX_CLK_PER_DOMAIN];
         struct clk *pclk[MAX_CLK_PER_DOMAIN];
+        struct clk *asb_clk[MAX_CLK_PER_DOMAIN];
 };
 
 static int exynos_pd_power(struct generic_pm_domain *domain, bool power_on)
@@ -45,14 +46,19 @@ static int exynos_pd_power(struct generic_pm_domain *domain, bool power_on)
         void __iomem *base;
         u32 timeout, pwr;
         char *op;
+        int i;
 
         pd = container_of(domain, struct exynos_pm_domain, pd);
         base = pd->base;
 
+        for (i = 0; i < MAX_CLK_PER_DOMAIN; i++) {
+                if (IS_ERR(pd->asb_clk[i]))
+                        break;
+                clk_prepare_enable(pd->asb_clk[i]);
+        }
+
         /* Set oscclk before powering off a domain*/
         if (!power_on) {
-                int i;
-
                 for (i = 0; i < MAX_CLK_PER_DOMAIN; i++) {
                         if (IS_ERR(pd->clk[i]))
                                 break;
@@ -81,8 +87,6 @@ static int exynos_pd_power(struct generic_pm_domain *domain, bool power_on)
 
         /* Restore clocks after powering on a domain*/
         if (power_on) {
-                int i;
-
                 for (i = 0; i < MAX_CLK_PER_DOMAIN; i++) {
                         if (IS_ERR(pd->clk[i]))
                                 break;
@@ -92,6 +96,12 @@ static int exynos_pd_power(struct generic_pm_domain *domain, bool power_on)
                 }
         }
 
+        for (i = 0; i < MAX_CLK_PER_DOMAIN; i++) {
+                if (IS_ERR(pd->asb_clk[i]))
+                        break;
+                clk_disable_unprepare(pd->asb_clk[i]);
+        }
+
         return 0;
 }
 
@@ -131,6 +141,15 @@ static __init int exynos4_pm_init_power_domain(void)
                 pd->pd.power_off = exynos_pd_power_off;
                 pd->pd.power_on = exynos_pd_power_on;
 
+                for (i = 0; i < MAX_CLK_PER_DOMAIN; i++) {
+                        char clk_name[8];
+
+                        snprintf(clk_name, sizeof(clk_name), "asb%d", i);
+                        pd->asb_clk[i] = clk_get(dev, clk_name);
+                        if (IS_ERR(pd->asb_clk[i]))
+                                break;
+                }
+
                 pd->oscclk = clk_get(dev, "oscclk");
                 if (IS_ERR(pd->oscclk))
                         goto no_clk;