[PATCH 1/5] hw/avr/atmega: Introduce the I/O clock

[Philippe Mathieu-Daudé]

Use the Clock API to model the I/O clock. As we don't model
the Clock Control Unit, the XTAL is its unique clock source.

Signed-off-by: Philippe Mathieu-Daudé <f4bug@amsat.org>
---
 hw/avr/atmega.h | 2 ++
 hw/avr/atmega.c | 4 ++++
 2 files changed, 6 insertions(+)

diff --git a/hw/avr/atmega.h b/hw/avr/atmega.h
index 0928cb0ce6..c91317107f 100644
--- a/hw/avr/atmega.h
+++ b/hw/avr/atmega.h
@@ -14,6 +14,7 @@
 #include "hw/char/avr_usart.h"
 #include "hw/timer/avr_timer16.h"
 #include "hw/misc/avr_power.h"
+#include "hw/clock.h"
 #include "target/avr/cpu.h"
 
 #define TYPE_ATMEGA_MCU     "ATmega"
@@ -35,6 +36,7 @@ typedef struct AtmegaMcuState {
     /*< public >*/
 
     AVRCPU cpu;
+    Clock *ioclk;
     MemoryRegion flash;
     MemoryRegion eeprom;
     MemoryRegion sram;
diff --git a/hw/avr/atmega.c b/hw/avr/atmega.c
index 7131224431..9d814de499 100644
--- a/hw/avr/atmega.c
+++ b/hw/avr/atmega.c
@@ -15,6 +15,7 @@
 #include "exec/memory.h"
 #include "exec/address-spaces.h"
 #include "sysemu/sysemu.h"
+#include "hw/qdev-clock.h"
 #include "hw/qdev-properties.h"
 #include "hw/sysbus.h"
 #include "hw/boards.h" /* FIXME memory_region_allocate_system_memory for sram 
*/
@@ -231,6 +232,9 @@ static void atmega_realize(DeviceState *dev, Error **errp)
         error_setg(errp, "\"xtal-frequency-hz\" property must be provided.");
         return;
     }
+    s->ioclk = qdev_init_clock_out(dev, "ioclk");
+    /* Clock Control Unit not implemented: directly distribute from xtal */
+    clock_set_hz(s->ioclk, s->xtal_freq_hz);
 
     /* CPU */
     object_initialize_child(OBJECT(dev), "cpu", &s->cpu, mc->cpu_type);
-- 
2.21.3