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>
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 @@
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 @@
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 @@
enable);
return ret;
}
+
+ if (enable && dev_pdata->startup_delay_us)
+ udelay(dev_pdata->startup_delay_us);
+
return 0;
}