mfd: pm8xxx-misc: add an API to preload the dVdd regulator
Add a new API, pm8xxx_preload_dVdd, which will preload the dVdd
regulator on PMIC PM8901 chips during off state. This can help
to reduce fluctuations in the dVdd voltage during startup at the
cost of additional off state current draw.
This API should only be called if dVdd startup issues are
suspected.
Change-Id: Ic7ee60539de37a761bb9ca6c5200327a7b99da89
CRs-Fixed: 326086
Signed-off-by: David Collins <collinsd@codeaurora.org>
diff --git a/include/linux/mfd/pm8xxx/misc.h b/include/linux/mfd/pm8xxx/misc.h
index 32189b2..f9fc498 100644
--- a/include/linux/mfd/pm8xxx/misc.h
+++ b/include/linux/mfd/pm8xxx/misc.h
@@ -160,6 +160,18 @@
*/
int pm8xxx_stay_on(void);
+/**
+ * pm8xxx_preload_dVdd - preload the dVdd regulator during off state.
+ *
+ * This can help to reduce fluctuations in the dVdd voltage during startup
+ * at the cost of additional off state current draw.
+ *
+ * This API should only be called if dVdd startup issues are suspected.
+ *
+ * RETURNS: an appropriate -ERRNO error value on error, or zero for success.
+ */
+int pm8xxx_preload_dVdd(void);
+
#else
static inline int pm8xxx_reset_pwr_off(int reset)
@@ -196,6 +208,10 @@
{
return -ENODEV;
}
+static inline int pm8xxx_preload_dVdd(void)
+{
+ return -ENODEV;
+}
#endif
#endif