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authorJohn Keeping <john@metanate.com>2016-08-22 15:10:09 +0100
committerTom Rini <trini@konsulko.com>2016-09-06 13:18:21 -0400
commit7302fbb31d1ba8b208ae5e400028c692167c7072 (patch)
treeeb647d4a9362026c43e16bb4fcf6453a9bcedc52 /drivers
parent07913d1e42c1db77acd653fb4aa671b664c59db2 (diff)
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: John Keeping <john@metanate.com> Reviewed-by: Tom Rini <trini@konsulko.com> Reviewed-by: Simon Glass <sjg@chromium.org>
Diffstat (limited to 'drivers')
-rw-r--r--drivers/power/regulator/fixed.c10
1 files changed, 10 insertions, 0 deletions
diff --git a/drivers/power/regulator/fixed.c b/drivers/power/regulator/fixed.c
index d053817fc22..37b8400903f 100644
--- a/drivers/power/regulator/fixed.c
+++ b/drivers/power/regulator/fixed.c
@@ -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,
+ dev->of_offset,
+ "startup-delay-us", 0);
+
return 0;
}
@@ -101,6 +107,10 @@ static int fixed_regulator_set_enable(struct udevice *dev, bool enable)
enable);
return ret;
}
+
+ if (enable && dev_pdata->startup_delay_us)
+ udelay(dev_pdata->startup_delay_us);
+
return 0;
}