pl050: add QEMU interface comment
This describes the PL050 device interface implemented within QEMU.
Signed-off-by: Mark Cave-Ayland <mark.cave-ayland@ilande.co.uk>
Message-Id: <20220624134109.881989-38-mark.cave-ayland@ilande.co.uk>
Reviewed-by: Peter Maydell <peter.maydell@linaro.org>
diff --git a/hw/input/pl050.c b/hw/input/pl050.c
index c665a4f..ffaa72d 100644
--- a/hw/input/pl050.c
+++ b/hw/input/pl050.c
@@ -7,6 +7,14 @@
* This code is licensed under the GPL.
*/
+/*
+ * QEMU interface:
+ * + sysbus MMIO region 0: MemoryRegion defining the PL050 registers
+ * + Named GPIO input "ps2-input-irq": set to 1 if the downstream PS2 device
+ * has asserted its irq
+ * + sysbus IRQ 0: PL050 output irq
+ */
+
#include "qemu/osdep.h"
#include "hw/sysbus.h"
#include "migration/vmstate.h"
