mspm33 driver fixes and increase test coverage

drivers/gpio/gpio_msp.c

@@ -241,6 +241,7 @@ static int gpio_msp_pin_configure(const struct device *port, gpio_pin_t pin, gpi
 		break;
 	case GPIO_DISCONNECTED:
 		DL_GPIO_disableOutput(config->base, BIT(pin));
+		DL_GPIO_initPeripheralAnalogFunction(pincm);
 		break;
 	default:
 		return -ENOTSUP;
@@ -423,8 +424,25 @@ static int gpio_msp_port_get_direction(const struct device *port, gpio_port_pins
 	const struct gpio_msp_config *config = port->config;
 
 	map &= config->common.port_pin_mask;
-	*inputs = map & ~config->base->DOE31_0;
-	*outputs = map & config->base->DOE31_0;
+
+	if (outputs != NULL) {
+		*outputs = map & config->base->DOE31_0;
+	}
+
+	if (inputs != NULL) {
+		*inputs = 0;
+		gpio_port_pins_t remaining = map;
+
+		while (remaining) {
+			uint32_t pin = find_lsb_set(remaining) - 1;
+			uint32_t pincm = gpio_msp_get_pincm(config, pin);
+
+			if (IOMUX->SECCFG.PINCM[pincm] & IOMUX_PINCM_INENA_MASK) {
+				*inputs |= BIT(pin);
+			}
+			remaining &= ~BIT(pin);
+		}
+	}
 
 	return 0;
 }

drivers/serial/uart_msp.c

@@ -208,9 +208,7 @@ static int uart_msp_irq_rx_ready(const struct device *dev)
 
 static int uart_msp_irq_is_pending(const struct device *dev)
 {
-	struct uart_msp_data *data = dev->data;
-
-	return data->pending_interrupt != DL_UART_MAIN_IIDX_NO_INTERRUPT;
+	return uart_msp_irq_tx_ready(dev) || uart_msp_irq_rx_ready(dev);
 }
 
 static int uart_msp_irq_update(const struct device *dev)

tests/drivers/gpio/gpio_basic_api/boards/lp_mspm33c321a.overlay

@@ -0,0 +1,13 @@
+/*
+ * Copyright (c) 2025 Texas Instruments
+ *
+ * SPDX-License-Identifier: Apache-2.0
+ */
+
+/ {
+	resources {
+		compatible = "test-gpio-basic-api";
+		out-gpios = <&gpiob 20 0>;
+		in-gpios = <&gpiob 21 0>;
+	};
+};

tests/drivers/gpio/gpio_get_direction/boards/lp_mspm33c321a.conf

@@ -0,0 +1,2 @@
+CONFIG_GPIO_GET_CONFIG=y
+CONFIG_GPIO_GET_DIRECTION=y