[PATCH v5 13/13] hw/gpio/bcm2835_gpio: Update to resettable

[Damien Hedde <damien.hedde@greensocs.com>]

Transition the bcm2835_gpio device class to Resettable.
The sdbus reparenting is delayed in hold phase to respect
resettable side-effect rules.

Signed-off-by: Damien Hedde <damien.hedde@greensocs.com>
---
Cc: Peter Maydell <peter.maydell@linaro.org>
Cc: Andrew Baumann <Andrew.Baumann@microsoft.com>
Cc: Philippe Mathieu-Daudé <philmd@redhat.com>
Cc: qemu-arm@nongnu.org
---
 hw/gpio/bcm2835_gpio.c | 21 ++++++++++++++-------
 1 file changed, 14 insertions(+), 7 deletions(-)

diff --git a/hw/gpio/bcm2835_gpio.c b/hw/gpio/bcm2835_gpio.c
index 81fe07132f..24e39eac5e 100644
--- a/hw/gpio/bcm2835_gpio.c
+++ b/hw/gpio/bcm2835_gpio.c
@@ -262,24 +262,29 @@ err_out:
             __func__, offset);
 }
 
-static void bcm2835_gpio_reset(DeviceState *dev)
+static void bcm2835_gpio_reset_enter(Object *obj, ResetType type)
 {
-    BCM2835GpioState *s = BCM2835_GPIO(dev);
+    BCM2835GpioState *s = BCM2835_GPIO(obj);
 
     int i;
     for (i = 0; i < 6; i++) {
         gpfsel_set(s, i, 0);
     }
 
+    s->lev0 = 0;
+    s->lev1 = 0;
+}
+
+static void bcm2835_gpio_reset_hold(Object *obj)
+{
+    BCM2835GpioState *s = BCM2835_GPIO(obj);
     /*
      * Setup the right sdbus (put 1 in sd_fsel to force reparenting
-     * the sd). It will be SDHCI because of the gpfsel_set() above.
+     * the sd). It will be SDHCI because of the gpfsel_set() done
+     * in bcm2835_gpio_reset_enter().
      */
     s->sd_fsel = 1;
     gpfsel_update_sdbus(s);
-
-    s->lev0 = 0;
-    s->lev1 = 0;
 }
 
 static const MemoryRegionOps bcm2835_gpio_ops = {
@@ -342,10 +347,12 @@ static void bcm2835_gpio_realize(DeviceState *dev, Error **errp)
 static void bcm2835_gpio_class_init(ObjectClass *klass, void *data)
 {
     DeviceClass *dc = DEVICE_CLASS(klass);
+    ResettableClass *rc = RESETTABLE_CLASS(klass);
 
     dc->vmsd = &vmstate_bcm2835_gpio;
     dc->realize = &bcm2835_gpio_realize;
-    dc->reset = &bcm2835_gpio_reset;
+    rc->phases.enter = &bcm2835_gpio_reset_enter;
+    rc->phases.hold  = &bcm2835_gpio_reset_hold;
 }
 
 static const TypeInfo bcm2835_gpio_info = {
-- 
2.23.0