mfd: mc13xxx: Configure WDI reset

Setup the PMIC to make a restart when a watchdog interrupt occures.
If this is not configured, the PMIC will shut down the power supply
without a restart.
Signed-off-by: NMarkus Pargmann <mpa@pengutronix.de>
Signed-off-by: NLee Jones <lee.jones@linaro.org>

drivers/mfd/mc13xxx-core.c

@@ -36,6 +36,9 @@
 #define MC34708_REVISION_FIN		(0x07 <<  6)
 #define MC34708_REVISION_FAB		(0x07 <<  9)
 
+#define MC13XXX_PWRCTRL		15
+#define MC13XXX_PWRCTRL_WDIRESET	(1 << 12)
+
 #define MC13XXX_ADC1		44
 #define MC13XXX_ADC1_ADEN		(1 << 0)
 #define MC13XXX_ADC1_RAND		(1 << 1)
@@ -416,6 +419,11 @@ int mc13xxx_common_init(struct device *dev)
 
 	mc13xxx->variant->print_revision(mc13xxx, revision);
 
+	ret = mc13xxx_reg_rmw(mc13xxx, MC13XXX_PWRCTRL,
+			MC13XXX_PWRCTRL_WDIRESET, MC13XXX_PWRCTRL_WDIRESET);
+	if (ret)
+		return ret;
+
 	for (i = 0; i < ARRAY_SIZE(mc13xxx->irqs); i++) {
 		mc13xxx->irqs[i].reg_offset = i / MC13XXX_IRQ_PER_REG;
 		mc13xxx->irqs[i].mask = BIT(i % MC13XXX_IRQ_PER_REG);