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regulator: fixed: obey startup delay

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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>
This commit is contained in:
John Keeping 2016-08-22 15:10:09 +01:00 • committed by Tom Rini
parent 07913d1e42
commit 7302fbb31d
2 changed files with 11 additions and 0 deletions
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1
doc/device-tree-bindings/regulator/fixed.txt
View file

@ -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.

10
drivers/power/regulator/fixed.c
View file

@ -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;
}