Commit 7302fbb3 authored by John Keeping's avatar John Keeping Committed by Tom Rini

regulator: fixed: obey startup delay

When enabling a fixed regulator, it may take some time to rise to the
correct voltage.  If we do not delay here then subsequent operations
will fail.
Signed-off-by: 's avatarJohn Keeping <>
Reviewed-by: 's avatarTom Rini <>
Reviewed-by: 's avatarSimon Glass <>
parent 07913d1e
......@@ -10,6 +10,7 @@ Required properties:
Optional properties:
- gpio: GPIO to use for enable control
- startup-delay-us: startup time in microseconds
- regulator constraints (binding info: regulator.txt)
Other kernel-style properties, are currently not used.
......@@ -19,6 +19,7 @@ DECLARE_GLOBAL_DATA_PTR;
struct fixed_regulator_platdata {
struct gpio_desc gpio; /* GPIO for regulator enable control */
unsigned int startup_delay_us;
static int fixed_regulator_ofdata_to_platdata(struct udevice *dev)
......@@ -42,6 +43,11 @@ static int fixed_regulator_ofdata_to_platdata(struct udevice *dev)
if (ret)
debug("Fixed regulator gpio - not found! Error: %d", ret);
/* Get optional ramp up delay */
dev_pdata->startup_delay_us = fdtdec_get_uint(gd->fdt_blob,
"startup-delay-us", 0);
return 0;
......@@ -101,6 +107,10 @@ static int fixed_regulator_set_enable(struct udevice *dev, bool enable)
return ret;
if (enable && dev_pdata->startup_delay_us)
return 0;
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