[PATCH QEMU v2 4/5] ARM: PL061: Add gpiodev support

[Geert Uytterhoeven <geert+renesas@glider.be>]

Make the PL061 GPIO controller user-creatable, and allow the user to tie
a newly created instance to a gpiochip on the host.

To create a new GPIO controller, the QEMU command line must be augmented
with:

    -device pl061,host=<gpiochip>

with <gpiochip> the name or label of the gpiochip on the host.

Signed-off-by: Geert Uytterhoeven <geert+renesas@glider.be>
---
v2:
  - New.
---
 hw/gpio/pl061.c | 35 +++++++++++++++++++++++++++++++++++
 qemu-options.hx |  9 +++++++++
 2 files changed, 44 insertions(+)

diff --git a/hw/gpio/pl061.c b/hw/gpio/pl061.c
index 74ba733a8a5e8ca5..98204f9a586ae8c8 100644
--- a/hw/gpio/pl061.c
+++ b/hw/gpio/pl061.c
@@ -12,11 +12,14 @@
 #include "hw/arm/fdt.h"
 #include "hw/gpio/pl061.h"
 #include "hw/irq.h"
+#include "hw/qdev-properties.h"
 #include "hw/sysbus.h"
 #include "migration/vmstate.h"
+#include "qapi/error.h"
 #include "qemu/log.h"
 #include "qemu/module.h"
 #include "sysemu/device_tree.h"
+#include "sysemu/gpiodev.h"
 
 //#define DEBUG_PL061 1
 
@@ -41,6 +44,9 @@ static const uint8_t pl061_id_luminary[12] =
 typedef struct PL061State {
     SysBusDevice parent_obj;
 
+#ifdef CONFIG_GPIODEV
+    char *host;
+#endif
     MemoryRegion iomem;
     uint32_t locked;
     uint32_t data;
@@ -370,10 +376,39 @@ static void pl061_init(Object *obj)
     qdev_init_gpio_out(dev, s->out, 8);
 }
 
+#ifdef CONFIG_GPIODEV
+static Property pl061_properties[] = {
+    DEFINE_PROP_STRING("host", PL061State, host),
+    DEFINE_PROP_END_OF_LIST(),
+};
+
+static void pl061_realize(DeviceState *dev, Error **errp)
+{
+    PL061State *s = PL061(dev);
+
+    if (!dev->opts) {
+        /* Not created by user */
+        return;
+    }
+
+    if (!s->host) {
+        error_setg(errp, "'host' property is required");
+        return;
+    }
+
+    qemu_gpiodev_add(dev, s->host, 8, errp);
+}
+#endif /* CONFIG_GPIODEV */
+
 static void pl061_class_init(ObjectClass *klass, void *data)
 {
     DeviceClass *dc = DEVICE_CLASS(klass);
 
+#ifdef CONFIG_GPIODEV
+    device_class_set_props(dc, pl061_properties);
+    dc->realize = pl061_realize;
+    dc->user_creatable = true;
+#endif
     dc->vmsd = &vmstate_pl061;
     dc->reset = &pl061_reset;
 }
diff --git a/qemu-options.hx b/qemu-options.hx
index 292d4e7c0cef6097..182de7fb63923b38 100644
--- a/qemu-options.hx
+++ b/qemu-options.hx
@@ -875,6 +875,15 @@ SRST
 ``-device isa-ipmi-bt,bmc=id[,ioport=val][,irq=val]``
     Like the KCS interface, but defines a BT interface. The default port
     is 0xe4 and the default interrupt is 5.
+
+#ifdef CONFIG_GPIODEV
+``-device pl061,host=gpiochip``
+    Add a PL061 GPIO controller, and map its virtual GPIO lines to a GPIO
+    controller on the host.
+
+    ``host=gpiochip``
+        The name or label of the GPIO controller on the host.
+#endif
 ERST
 
 DEF("name", HAS_ARG, QEMU_OPTION_name,
-- 
2.17.1