drivers: mfd: nxp_lp_flexcomm: introduce clearirqhandler

Introduce clearirqhandler which clears the irq handler of a
peripheral. Useful for device_deinit().

Signed-off-by: Bjarki Arge Andreasen <bjarki.andreasen@nordicsemi.no>

Author: bjarki-andreasen

drivers/mfd/mfd_nxp_lp_flexcomm.c

@@ -81,6 +81,18 @@ void nxp_lp_flexcomm_setirqhandler(const struct device *dev, const struct device
 	child->dev = child_dev;
 }
 
+void nxp_lp_flexcomm_clearirqhandler(const struct device *dev, LP_FLEXCOMM_PERIPH_T periph)
+{
+	struct nxp_lp_flexcomm_data *data = dev->data;
+	struct nxp_lp_flexcomm_child *child;
+
+	child = &data->children[periph];
+
+	/* Clear the interrupt handler and the child device node */
+	child->lp_flexcomm_child_isr = NULL;
+	child->dev = NULL;
+}
+
 static int nxp_lp_flexcomm_init(const struct device *dev)
 {
 	const struct nxp_lp_flexcomm_config *config = dev->config;

include/zephyr/drivers/mfd/nxp_lp_flexcomm.h

@@ -13,4 +13,6 @@ typedef void (*child_isr_t)(const struct device *dev);
 void nxp_lp_flexcomm_setirqhandler(const struct device *dev, const struct device *child_dev,
 				   LP_FLEXCOMM_PERIPH_T periph, child_isr_t handler);
 
+void nxp_lp_flexcomm_clearirqhandler(const struct device *dev, LP_FLEXCOMM_PERIPH_T periph);
+
 #endif /* ZEPHYR_DRIVERS_NXP_LP_FLEXCOMM_H_ */