[nrf fromtree] drivers: mfd: mfd_npm2100: add open drain and pull up config to int pin

Add possibility to configure open drain and pull up on nPM2100's
interrupt output through DTS flags.

Signed-off-by: Sergei Ovchinnikov <[email protected]>
(cherry picked from commit 32b79cf)

Author: seov-nordic

drivers/mfd/mfd_npm2100.c

@@ -55,9 +55,11 @@
 
 #define EVENTS_SIZE 5U
 
-#define GPIO_USAGE_INTLO   0x01U
-#define GPIO_USAGE_INTHI   0x02U
-#define GPIO_CONFIG_OUTPUT 0x02U
+#define GPIO_USAGE_INTLO      0x01U
+#define GPIO_USAGE_INTHI      0x02U
+#define GPIO_CONFIG_OUTPUT    0x02U
+#define GPIO_CONFIG_OPENDRAIN 0x04U
+#define GPIO_CONFIG_PULLUP    0x10U
 
 #define RESET_STICKY_PWRBUT 0x04U
 
@@ -171,10 +173,17 @@ static int config_pmic_int(const struct device *dev)
 {
 	const struct mfd_npm2100_config *config = dev->config;
 	uint8_t usage = GPIO_USAGE_INTHI;
+	uint8_t gpio_config = GPIO_CONFIG_OUTPUT;
 
 	if (config->pmic_int_flags & GPIO_ACTIVE_LOW) {
 		usage = GPIO_USAGE_INTLO;
 	}
+	if ((config->pmic_int_flags & GPIO_SINGLE_ENDED) != 0U) {
+		gpio_config |= GPIO_CONFIG_OPENDRAIN;
+	}
+	if (config->pmic_int_flags & GPIO_PULL_UP) {
+		gpio_config |= GPIO_CONFIG_PULLUP;
+	}
 
 	/* Set specified PMIC pin to be interrupt output */
 	int ret = i2c_reg_write_byte_dt(&config->i2c, GPIO_USAGE + config->pmic_int_pin, usage);
@@ -184,8 +193,7 @@ static int config_pmic_int(const struct device *dev)
 	}
 
 	/* Configure PMIC output pin */
-	return i2c_reg_write_byte_dt(&config->i2c, GPIO_CONFIG + config->pmic_int_pin,
-				     GPIO_CONFIG_OUTPUT);
+	return i2c_reg_write_byte_dt(&config->i2c, GPIO_CONFIG + config->pmic_int_pin, gpio_config);
 }
 
 static int config_shphold(const struct device *dev)