1 files changed, 16 insertions, 0 deletions
diff --git a/include/hw/qdev-core.h b/include/hw/qdev-core.h
index 868973319e..a653295d6f 100644
--- a/include/hw/qdev-core.h
+++ b/include/hw/qdev-core.h
@@ -444,6 +444,22 @@ void qdev_machine_creation_done(void);
 bool qdev_machine_modified(void);
 
 /**
+ * GpioPolarity: Polarity of a GPIO line
+ *
+ * GPIO lines use either positive (active-high) logic,
+ * or negative (active-low) logic.
+ *
+ * In active-high logic (%GPIO_POLARITY_ACTIVE_HIGH), a pin is
+ * active when the voltage on the pin is high (relative to ground);
+ * whereas in active-low logic (%GPIO_POLARITY_ACTIVE_LOW), a pin
+ * is active when the voltage on the pin is low (or grounded).
+ */
+typedef enum {
+    GPIO_POLARITY_ACTIVE_LOW,
+    GPIO_POLARITY_ACTIVE_HIGH
+} GpioPolarity;
+
+/**
  * qdev_get_gpio_in: Get one of a device's anonymous input GPIO lines
  * @dev: Device whose GPIO we want
  * @n: Number of the anonymous GPIO line (which must be in range)