gpio: implement pin_get_config in npcx driver

This commit adds support for pin_get_config function in npcx driver.

Signed-off-by: Michał Barnaś <[email protected]>

drivers/gpio/gpio_npcx.c

@@ -165,6 +165,49 @@ static int gpio_npcx_config(const struct device *dev,
 	return 0;
 }
 
+#ifdef CONFIG_GPIO_GET_CONFIG
+static int gpio_npcx_pin_get_config(const struct device *port, gpio_pin_t pin,
+				    gpio_flags_t *out_flags)
+{
+	struct gpio_reg *const inst = HAL_INSTANCE(port);
+	uint32_t mask = BIT(pin);
+	gpio_flags_t flags = 0;
+
+	/* 0:input 1:output */
+	if (inst->PDIR & mask) {
+		flags |= GPIO_OUTPUT;
+
+		/* 0:push-pull 1:open-drain */
+		if (inst->PTYPE & mask) {
+			flags |= GPIO_OPEN_DRAIN;
+		}
+
+		/* 0:low 1:high */
+		if (inst->PDOUT & mask) {
+			flags |= GPIO_OUTPUT_HIGH;
+		} else {
+			flags |= GPIO_OUTPUT_LOW;
+		}
+	} else {
+		flags |= GPIO_INPUT;
+
+		/* 0:disabled 1:enabled pull */
+		if (inst->PPULL & mask) {
+			/* 0:pull-up 1:pull-down */
+			if (inst->PPUD & mask) {
+				flags |= GPIO_PULL_DOWN;
+			} else {
+				flags |= GPIO_PULL_UP;
+			}
+		}
+	}
+
+	*out_flags = flags;
+
+	return 0;
+}
+#endif
+
 static int gpio_npcx_port_get_raw(const struct device *dev,
 				  gpio_port_value_t *value)
 {
@@ -311,6 +354,9 @@ static int gpio_npcx_manage_callback(const struct device *dev,
 /* GPIO driver registration */
 static const struct gpio_driver_api gpio_npcx_driver = {
 	.pin_configure = gpio_npcx_config,
+#ifdef CONFIG_GPIO_GET_CONFIG
+	.pin_get_config = gpio_npcx_pin_get_config,
+#endif
 	.port_get_raw = gpio_npcx_port_get_raw,
 	.port_set_masked_raw = gpio_npcx_port_set_masked_raw,
 	.port_set_bits_raw = gpio_npcx_port_set_bits_raw,