From 7302fbb31d1ba8b208ae5e400028c692167c7072 Mon Sep 17 00:00:00 2001 From: John Keeping Date: Mon, 22 Aug 2016 15:10:09 +0100 Subject: 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 Reviewed-by: Tom Rini Reviewed-by: Simon Glass --- drivers/power/regulator/fixed.c | 10 ++++++++++ 1 file changed, 10 insertions(+) (limited to 'drivers/power/regulator') diff --git a/drivers/power/regulator/fixed.c b/drivers/power/regulator/fixed.c index d053817..37b8400 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; } -- cgit v1.1