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drivers: regulator: fixed: add u-boot, off-on-delay-us

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Add u-boot,off-on-delay-us for fixed regulator.

Depends on board design, the gpio regulator sometimes
connects with a big capacitance. When need to off, then
on the regulator, if there is no enough delay,
the voltage does not drop to 0, so introduce this
property to handle such case.

Signed-off-by: Peng Fan <peng.fan@nxp.com>
Reviewed-by: Simon Glass <sjg@chromium.org>
Cc: Masahiro Yamada <yamada.masahiro@socionext.com>
This commit is contained in:
Peng Fan
2018-07-26 19:47:24 +08:00
committed by Tom Rini
parent 4aee624c92
commit 39dd00fc5d
2 changed files with 7 additions and 0 deletions
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6
drivers/power/regulator/fixed.c
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@@ -16,6 +16,7 @@
struct fixed_regulator_platdata {
struct gpio_desc gpio; /* GPIO for regulator enable control */
unsigned int startup_delay_us;
unsigned int off_on_delay_us;
};
static int fixed_regulator_ofdata_to_platdata(struct udevice *dev)
@@ -50,6 +51,8 @@ static int fixed_regulator_ofdata_to_platdata(struct udevice *dev)
/* Get optional ramp up delay */
dev_pdata->startup_delay_us = dev_read_u32_default(dev,
"startup-delay-us", 0);
dev_pdata->off_on_delay_us =
dev_read_u32_default(dev, "u-boot,off-on-delay-us", 0);
return 0;
}
@@ -123,6 +126,9 @@ static int fixed_regulator_set_enable(struct udevice *dev, bool enable)
udelay(dev_pdata->startup_delay_us);
debug("%s: done\n", __func__);
if (!enable && dev_pdata->off_on_delay_us)
udelay(dev_pdata->off_on_delay_us);
return 0;
}