[PATCH 4/5] hw/char/avr_usart: Use the Clock API

[Philippe Mathieu-Daudé]

Expose the 'xck' clock source. Connect the MCU I/O clock to it.

Signed-off-by: Philippe Mathieu-Daudé <f4...@amsat.org>
---
 include/hw/char/avr_usart.h | 2 ++
 hw/avr/atmega.c             | 1 +
 hw/char/avr_usart.c         | 3 +++
 3 files changed, 6 insertions(+)

diff --git a/include/hw/char/avr_usart.h b/include/hw/char/avr_usart.h
index 46d6c76e50..13cfd5ea07 100644
--- a/include/hw/char/avr_usart.h
+++ b/include/hw/char/avr_usart.h
@@ -25,6 +25,7 @@
 #include "hw/sysbus.h"
 #include "chardev/char-fe.h"
 #include "hw/hw.h"
+#include "hw/clock.h"
 
 #define TYPE_AVR_USART "avr-usart"
 #define AVR_USART(obj) \
@@ -51,6 +52,7 @@ typedef struct {
     /* Baud Rate Registers (low/high byte) */
     uint8_t brrh;
     uint8_t brrl;
+    Clock *clkin;
 
     /* Receive Complete */
     qemu_irq rxc_irq;
diff --git a/hw/avr/atmega.c b/hw/avr/atmega.c
index f14b558140..b6e86a4531 100644
--- a/hw/avr/atmega.c
+++ b/hw/avr/atmega.c
@@ -302,6 +302,7 @@ static void atmega_realize(DeviceState *dev, Error **errp)
         object_initialize_child(OBJECT(dev), devname, &s->usart[i],
                                 TYPE_AVR_USART);
         qdev_prop_set_chr(DEVICE(&s->usart[i]), "chardev", serial_hd(i));
+        qdev_connect_clock_in(DEVICE(&s->usart[i]), "xck", s->ioclk);
         sbd = SYS_BUS_DEVICE(&s->usart[i]);
         sysbus_realize(sbd, &error_abort);
         sysbus_mmio_map(sbd, 0, OFFSET_DATA + mc->dev[USART(i)].addr);
diff --git a/hw/char/avr_usart.c b/hw/char/avr_usart.c
index fd0b488ef9..4a43492082 100644
--- a/hw/char/avr_usart.c
+++ b/hw/char/avr_usart.c
@@ -23,6 +23,7 @@
 #include "hw/char/avr_usart.h"
 #include "qemu/log.h"
 #include "hw/irq.h"
+#include "hw/qdev-clock.h"
 #include "hw/qdev-properties.h"
 
 /* Offsets of registers. */
@@ -307,12 +308,14 @@ static void avr_usart_pr(void *opaque, int irq, int level)
 static void avr_usart_init(Object *obj)
 {
     AVRUsartState *s = AVR_USART(obj);
+
     sysbus_init_irq(SYS_BUS_DEVICE(obj), &s->rxc_irq);
     sysbus_init_irq(SYS_BUS_DEVICE(obj), &s->dre_irq);
     sysbus_init_irq(SYS_BUS_DEVICE(obj), &s->txc_irq);
     memory_region_init_io(&s->mmio, obj, &avr_usart_ops, s, TYPE_AVR_USART, 7);
     sysbus_init_mmio(SYS_BUS_DEVICE(obj), &s->mmio);
     qdev_init_gpio_in(DEVICE(s), avr_usart_pr, 1);
+    s->clkin = qdev_init_clock_in(DEVICE(obj), "xck", NULL, s);
     s->enabled = true;
 }
 
-- 
2.21.3