twl-regulator: Add turnon delay to reg_enable
This change implements a basic turnon delay in the regulator enable function
to make it less probable that reg_enable returns before the regulator
output is at target level
Signed-off-by: Juha Keski-Saari <ext-juha.1.keski-saari@nokia.com>
Acked-by: Mark Brown <broonie@opensource.wolfsonmicro.com>
Signed-off-by: Liam Girdwood <lrg@slimlogic.co.uk>
diff --git a/drivers/regulator/twl-regulator.c b/drivers/regulator/twl-regulator.c
index 6c464b8..9bcea4d 100644
--- a/drivers/regulator/twl-regulator.c
+++ b/drivers/regulator/twl-regulator.c
@@ -12,6 +12,7 @@
#include <linux/module.h>
#include <linux/init.h>
#include <linux/err.h>
+#include <linux/delay.h>
#include <linux/platform_device.h>
#include <linux/regulator/driver.h>
#include <linux/regulator/machine.h>
@@ -134,6 +135,7 @@
{
struct twlreg_info *info = rdev_get_drvdata(rdev);
int grp;
+ int ret;
grp = twlreg_read(info, TWL_MODULE_PM_RECEIVER, VREG_GRP);
if (grp < 0)
@@ -144,7 +146,11 @@
else
grp |= P1_GRP_6030;
- return twlreg_write(info, TWL_MODULE_PM_RECEIVER, VREG_GRP, grp);
+ ret = twlreg_write(info, TWL_MODULE_PM_RECEIVER, VREG_GRP, grp);
+
+ udelay(info->delay);
+
+ return ret;
}
static int twlreg_disable(struct regulator_dev *rdev)