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Date: Wed, 11 Jun 2014 09:41:22 +0900
From: Chanwoo Choi <cw00.choi@...sung.com>
To: broonie@...nel.org, lgirdwood@...il.com, grant.likely@...aro.org,
robh+dt@...nel.org
Cc: myungjoo.ham@...sung.com, kyungmin.park@...sung.com,
linux-kernel@...r.kernel.org, devicetree@...r.kernel.org,
Chanwoo Choi <cw00.choi@...sung.com>
Subject: [PATCHv2 1/2] 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 STANDBY/HIBERNATE mode. This patch add support
for parsing regulator_state for suspend state.
Signed-off-by: Chanwoo Choi <cw00.choi@...sung.com>
---
drivers/regulator/of_regulator.c | 76 ++++++++++++++++++++++++++++++++++++++--
1 file changed, 74 insertions(+), 2 deletions(-)
diff --git a/drivers/regulator/of_regulator.c b/drivers/regulator/of_regulator.c
index ee5e67b..cf280ab 100644
--- a/drivers/regulator/of_regulator.c
+++ b/drivers/regulator/of_regulator.c
@@ -16,12 +16,20 @@
#include <linux/regulator/machine.h>
#include <linux/regulator/of_regulator.h>
+const char *const regulator_states[PM_SUSPEND_MAX + 1] = {
+ [PM_SUSPEND_STANDBY] = "regulator-state-standby",
+ [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;
+ const __be32 *min_uV, *max_uV, *suspend_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);
@@ -70,6 +78,70 @@ 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;
+
+ ret = of_property_read_u32(np, "regulator-initial-state", &pval);
+ if (!ret) {
+ switch (pval) {
+ case PM_SUSPEND_STANDBY:
+ case PM_SUSPEND_MEM:
+ case PM_SUSPEND_MAX:
+ constraints->initial_state = pval;
+ break;
+ default:
+ break;
+ };
+ }
+
+ for (i = 0; i < ARRAY_SIZE(regulator_states); i++) {
+ switch (i) {
+ case PM_SUSPEND_STANDBY:
+ suspend_state = &constraints->state_standby;
+ break;
+ 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:
+ default:
+ continue;
+ };
+
+ suspend_np = of_get_child_by_name(np, regulator_states[i]);
+ if (!suspend_np || !suspend_state)
+ continue;
+
+ suspend_uV = of_get_property(suspend_np, "regulator-volt", NULL);
+ if (suspend_uV) {
+ suspend_state->uV = be32_to_cpu(*suspend_uV);
+
+ if (suspend_state->uV < constraints->min_uV)
+ suspend_state->uV = constraints->min_uV;
+ if (suspend_state->uV > constraints->max_uV)
+ suspend_state->uV = constraints->max_uV;
+ }
+
+ ret = of_property_read_u32(suspend_np, "regulator-mode", &pval);
+ if (!ret) {
+ u32 regulator_mode = REGULATOR_MODE_FAST
+ | REGULATOR_MODE_NORMAL
+ | REGULATOR_MODE_IDLE
+ | REGULATOR_MODE_STANDBY;
+ if (pval <= regulator_mode)
+ suspend_state->mode = pval;
+ }
+
+ if (of_property_read_bool(suspend_np, "regulator-on-in-suspend"))
+ suspend_state->enabled = true;
+
+ if (of_property_read_bool(suspend_np, "regulator-off-in-suspend"))
+ suspend_state->disabled = true;
+
+ suspend_state = NULL;
+ suspend_np = NULL;
+ }
}
/**
--
1.8.0
--
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