[nrf fromtree] drivers: mfd: npm2100: Add hibernate_pt mode support

Extend mfd_npm2100_hibernate function with pass_through argument,
which is used to differentiate between hibernate and hibernate_pt
modes.

Signed-off-by: Audun Korneliussen <[email protected]>
(cherry picked from commit 984c2d3e34d88d7a7f8d50999b2da7e852435030)

Author: nordic-auko

drivers/mfd/mfd_npm2100.c

@@ -26,6 +26,7 @@
 #define SHPHLD_WAKEUP         0xC1U
 #define SHPHLD_SHPHLD         0xC2U
 #define HIBERNATE_TASKS_HIBER 0xC8U
+#define HIBERNATE_TASKS_HIBERPT 0xC9U
 #define RESET_TASKS_RESET     0xD0U
 #define RESET_BUTTON          0xD2U
 #define RESET_PIN             0xD3U
@@ -337,7 +338,7 @@ int mfd_npm2100_reset(const struct device *dev)
 	return i2c_reg_write_byte_dt(&config->i2c, RESET_TASKS_RESET, 1U);
 }
 
-int mfd_npm2100_hibernate(const struct device *dev, uint32_t time_ms)
+int mfd_npm2100_hibernate(const struct device *dev, uint32_t time_ms, bool pass_through)
 {
 	const struct mfd_npm2100_config *config = dev->config;
 	int ret;
@@ -365,7 +366,8 @@ int mfd_npm2100_hibernate(const struct device *dev, uint32_t time_ms)
 		return ret;
 	}
 
-	return i2c_reg_write_byte_dt(&config->i2c, HIBERNATE_TASKS_HIBER, 1U);
+	return i2c_reg_write_byte_dt(
+		&config->i2c, pass_through ? HIBERNATE_TASKS_HIBERPT : HIBERNATE_TASKS_HIBER, 1U);
 }
 
 int mfd_npm2100_add_callback(const struct device *dev, struct gpio_callback *callback)

include/zephyr/drivers/mfd/npm2100.h

@@ -92,15 +92,18 @@ int mfd_npm2100_reset(const struct device *dev);
  * @brief npm2100 hibernate
  *
  * Enters low power state, and wakes after specified time or "shphld" pin signal.
+ * Pass-through mode can be used when the battery voltage is high enough to supply the pmic directly
+ * without boosting. This lowers the power consumption of the pmic when hibernate mode is active.
  *
  * @param dev npm2100 mfd device
  * @param time_ms timer value in ms. Set to 0 to disable timer.
+ * @param pass_through set to use pass-through hibernate mode.
  * @retval 0 If successful
  * @retval -EINVAL if time value is too large
  * @retval -EBUSY if the timer is already in use.
  * @retval -errno In case of any bus error (see i2c_write_dt())
  */
-int mfd_npm2100_hibernate(const struct device *dev, uint32_t time_ms);
+int mfd_npm2100_hibernate(const struct device *dev, uint32_t time_ms, bool pass_through);
 
 /**
  * @brief Add npm2100 event callback