regulator: of: Add support for parsing regulator_state for suspend state

The regulation_constraints structure includes specific field to support
suspend state for global PMIC SUSPEND/HIBERNATE mode. This patch add support
for parsing regulator_state for suspend state.

Signed-off-by: Chanwoo Choi <cw00.choi@samsung.com>
Acked-by: Kyungmin Park <kyungmin.park@samsung.com>
Signed-off-by: Mark Brown <broonie@kernel.org>

1 files changed, 38 insertions, 1 deletions

diff --git a/drivers/regulator/of_regulator.c b/drivers/regulator/of_regulator.c
index 7a51814abdc5..b375ffe40df1 100644
--- a/drivers/regulator/of_regulator.c
+++ b/drivers/regulator/of_regulator.c
@@ -19,12 +19,19 @@
 
 #include "internal.h"
 
+const char *const regulator_states[PM_SUSPEND_MAX + 1] = {
+        [PM_SUSPEND_MEM]        = "regulator-state-mem",
+        [PM_SUSPEND_MAX]        = "regulator-state-disk",
+};
+
 static void of_get_regulation_constraints(struct device_node *np,
                                         struct regulator_init_data **init_data)
 {
         const __be32 *min_uV, *max_uV;
         struct regulation_constraints *constraints = &(*init_data)->constraints;
-        int ret;
+        struct regulator_state *suspend_state;
+        struct device_node *suspend_np;
+        int ret, i;
         u32 pval;
 
         constraints->name = of_get_property(np, "regulator-name", NULL);
@@ -73,6 +80,36 @@ static void of_get_regulation_constraints(struct device_node *np,
         ret = of_property_read_u32(np, "regulator-enable-ramp-delay", &pval);
         if (!ret)
                 constraints->enable_time = pval;
+
+        for (i = 0; i < ARRAY_SIZE(regulator_states); i++) {
+                switch (i) {
+                case PM_SUSPEND_MEM:
+                        suspend_state = &constraints->state_mem;
+                        break;
+                case PM_SUSPEND_MAX:
+                        suspend_state = &constraints->state_disk;
+                        break;
+                case PM_SUSPEND_ON:
+                case PM_SUSPEND_FREEZE:
+                case PM_SUSPEND_STANDBY:
+                default:
+                        continue;
+                };
+
+                suspend_np = of_get_child_by_name(np, regulator_states[i]);
+                if (!suspend_np || !suspend_state)
+                        continue;
+
+                if (of_property_read_bool(suspend_np,
+                                        "regulator-on-in-suspend"))
+                        suspend_state->enabled = true;
+                else if (of_property_read_bool(suspend_np,
+                                        "regulator-off-in-suspend"))
+                        suspend_state->disabled = true;
+
+                suspend_state = NULL;
+                suspend_np = NULL;
+        }
 }
 
 /**