power: regulator: Add support for regulator-force-boot-off
Add support for regulator-force-boot-off DT property.
This property can be used by the board/device drivers for
turning off regulators on early init stages as pre-requisite
for the other components initialization.
Signed-off-by: Konstantin Porotchkin <kostap@marvell.com>
Signed-off-by: Stefan Roese <sr@denx.de>
Cc: Jaehoon Chung <jh80.chung@samsung.com>
Cc: Simon Glass <sjg@chromium.org>
Reviewed-by: Jaehoon Chung <jh80.chung@samsung.com>
diff --git a/drivers/power/regulator/regulator-uclass.c b/drivers/power/regulator/regulator-uclass.c
index 4d2e730..fac9606 100644
--- a/drivers/power/regulator/regulator-uclass.c
+++ b/drivers/power/regulator/regulator-uclass.c
@@ -311,6 +311,17 @@
return ret;
}
+int regulator_unset(struct udevice *dev)
+{
+ struct dm_regulator_uclass_plat *uc_pdata;
+
+ uc_pdata = dev_get_uclass_plat(dev);
+ if (uc_pdata && uc_pdata->force_off)
+ return regulator_set_enable(dev, false);
+
+ return -EMEDIUMTYPE;
+}
+
static void regulator_show(struct udevice *dev, int ret)
{
struct dm_regulator_uclass_plat *uc_pdata;
@@ -443,6 +454,7 @@
uc_pdata->boot_on = dev_read_bool(dev, "regulator-boot-on");
uc_pdata->ramp_delay = dev_read_u32_default(dev, "regulator-ramp-delay",
0);
+ uc_pdata->force_off = dev_read_bool(dev, "regulator-force-boot-off");
node = dev_read_subnode(dev, "regulator-state-mem");
if (ofnode_valid(node)) {
@@ -495,6 +507,32 @@
return ret;
}
+int regulators_enable_boot_off(bool verbose)
+{
+ struct udevice *dev;
+ struct uclass *uc;
+ int ret;
+
+ ret = uclass_get(UCLASS_REGULATOR, &uc);
+ if (ret)
+ return ret;
+ for (uclass_first_device(UCLASS_REGULATOR, &dev);
+ dev;
+ uclass_next_device(&dev)) {
+ ret = regulator_unset(dev);
+ if (ret == -EMEDIUMTYPE) {
+ ret = 0;
+ continue;
+ }
+ if (verbose)
+ regulator_show(dev, ret);
+ if (ret == -ENOSYS)
+ ret = 0;
+ }
+
+ return ret;
+}
+
UCLASS_DRIVER(regulator) = {
.id = UCLASS_REGULATOR,
.name = "regulator",
diff --git a/include/power/regulator.h b/include/power/regulator.h
index da9a065..fad87c9 100644
--- a/include/power/regulator.h
+++ b/include/power/regulator.h
@@ -151,6 +151,7 @@
* @max_uA* - maximum amperage (micro Amps)
* @always_on* - bool type, true or false
* @boot_on* - bool type, true or false
+ * @force_off* - bool type, true or false
* TODO(sjg@chromium.org): Consider putting the above two into @flags
* @ramp_delay - Time to settle down after voltage change (unit: uV/us)
* @flags: - flags value (see REGULATOR_FLAG_...)
@@ -176,6 +177,7 @@
unsigned int ramp_delay;
bool always_on;
bool boot_on;
+ bool force_off;
const char *name;
int flags;
u8 ctrl_reg;
@@ -421,6 +423,15 @@
int regulators_enable_boot_on(bool verbose);
/**
+ * regulators_enable_boot_off() - disable regulators needed for boot
+ *
+ * This disables all regulators which are marked to be off at boot time.
+ *
+ * This effectively calls regulator_unset() for every regulator.
+ */
+int regulators_enable_boot_off(bool verbose);
+
+/**
* regulator_autoset: setup the voltage/current on a regulator
*
* The setup depends on constraints found in device's uclass's platform data
@@ -440,6 +451,18 @@
int regulator_autoset(struct udevice *dev);
/**
+ * regulator_unset: turn off a regulator
+ *
+ * The setup depends on constraints found in device's uclass's platform data
+ * (struct dm_regulator_uclass_platdata):
+ *
+ * - Disable - will set - if 'force_off' is set to true,
+ *
+ * The function returns on the first-encountered error.
+ */
+int regulator_unset(struct udevice *dev);
+
+/**
* regulator_autoset_by_name: setup the regulator given by its uclass's
* platform data name field. The setup depends on constraints found in device's
* uclass's platform data (struct dm_regulator_uclass_plat):