+static int rk808_shutdown(struct regmap *regmap)
+{
+ int ret;
+
+ ret = regmap_update_bits(regmap,
+ RK808_DEVCTRL_REG,
+ DEV_OFF_RST, DEV_OFF_RST);
+ return ret;
+}
+
+static int rk818_shutdown(struct regmap *regmap)
+{
+ int ret;
+
+ ret = regmap_update_bits(regmap,
+ RK818_DEVCTRL_REG,
+ DEV_OFF, DEV_OFF);
+ return ret;
+}
+
+static bool rk818_is_volatile_reg(struct device *dev, unsigned int reg)
+{
+ /*
+ * Notes:
+ * - Technically the ROUND_30s bit makes RTC_CTRL_REG volatile, but
+ * we don't use that feature. It's better to cache.
+ * - It's unlikely we care that RK808_DEVCTRL_REG is volatile since
+ * bits are cleared in case when we shutoff anyway, but better safe.
+ */
+
+ switch (reg) {
+ case RK808_SECONDS_REG ... RK808_WEEKS_REG:
+ case RK808_RTC_STATUS_REG:
+ case RK808_VB_MON_REG:
+ case RK808_THERMAL_REG:
+ case RK808_DCDC_EN_REG:
+ case RK808_DCDC_UV_STS_REG:
+ case RK808_LDO_UV_STS_REG:
+ case RK808_DCDC_PG_REG:
+ case RK808_LDO_PG_REG:
+ case RK808_DEVCTRL_REG:
+ case RK808_INT_STS_REG1:
+ case RK808_INT_STS_REG2:
+ case RK808_INT_STS_MSK_REG1:
+ case RK808_INT_STS_MSK_REG2:
+ case RK818_SUP_STS_REG ... RK818_SAVE_DATA19:
+ return true;
+ }
+
+ return false;
+}
+