From: Inès Varhol <ines.varhol@telecom-paris.fr>

The SYSCFG input GPIOs aren't connected yet. When the STM32L4x5 GPIO
device will be implemented, its output GPIOs will be connected to the
SYSCFG input GPIOs.

Signed-off-by: Arnaud Minier <arnaud.minier@telecom-paris.fr>
Signed-off-by: Inès Varhol <ines.varhol@telecom-paris.fr>
---
 hw/arm/Kconfig                 |  1 +
 hw/arm/stm32l4x5_soc.c         | 23 ++++++++++++++++++++++-
 include/hw/arm/stm32l4x5_soc.h |  2 ++
 3 files changed, 25 insertions(+), 1 deletion(-)

diff --git a/hw/arm/Kconfig b/hw/arm/Kconfig
index 9c9d5bb541..e7c9470d59 100644
--- a/hw/arm/Kconfig
+++ b/hw/arm/Kconfig
@@ -458,6 +458,7 @@ config STM32L4X5_SOC
     bool
     select ARM_V7M
     select OR_IRQ
+    select STM32L4X5_SYSCFG
     select STM32L4X5_EXTI
 
 config XLNX_ZYNQMP_ARM
diff --git a/hw/arm/stm32l4x5_soc.c b/hw/arm/stm32l4x5_soc.c
index b07593730f..45f5c2156c 100644
--- a/hw/arm/stm32l4x5_soc.c
+++ b/hw/arm/stm32l4x5_soc.c
@@ -46,6 +46,7 @@
 #define SRAM2_SIZE (32 * KiB)
 
 #define EXTI_ADDR 0x40010400
+#define SYSCFG_ADDR 0x40010000
 
 #define NUM_EXTI_IRQ 40
 /* Match exti line connections with their CPU IRQ number */
@@ -90,6 +91,8 @@ static void stm32l4x5_soc_initfn(Object *obj)
 
     object_initialize_child(obj, "exti", &s->exti, TYPE_STM32L4X5_EXTI);
 
+    object_initialize_child(obj, "syscfg", &s->syscfg, TYPE_STM32L4X5_SYSCFG);
+
     s->sysclk = qdev_init_clock_in(DEVICE(s), "sysclk", NULL, NULL, 0);
     s->refclk = qdev_init_clock_in(DEVICE(s), "refclk", NULL, NULL, 0);
 }
@@ -167,6 +170,20 @@ static void stm32l4x5_soc_realize(DeviceState *dev_soc, Error **errp)
         return;
     }
 
+    /* System configuration controller */
+    dev = DEVICE(&s->syscfg);
+    if (!sysbus_realize(SYS_BUS_DEVICE(&s->syscfg), errp)) {
+        return;
+    }
+    busdev = SYS_BUS_DEVICE(dev);
+    sysbus_mmio_map(busdev, 0, SYSCFG_ADDR);
+    /*
+     * TODO: when the GPIO device is implemented, connect it
+     * to SYCFG using `qdev_connect_gpio_out`, NUM_GPIOS and
+     * GPIO_NUM_PINS.
+     */
+
+    /* EXTI device */
     dev = DEVICE(&s->exti);
     if (!sysbus_realize(SYS_BUS_DEVICE(&s->exti), errp)) {
         return;
@@ -177,6 +194,11 @@ static void stm32l4x5_soc_realize(DeviceState *dev_soc, Error **errp)
         sysbus_connect_irq(busdev, i, qdev_get_gpio_in(armv7m, exti_irq[i]));
     }
 
+    for (i = 0; i < 16; i++) {
+        qdev_connect_gpio_out(DEVICE(&s->syscfg), i,
+                              qdev_get_gpio_in(dev, i));
+    }
+
     /* APB1 BUS */
     create_unimplemented_device("TIM2",      0x40000000, 0x400);
     create_unimplemented_device("TIM3",      0x40000400, 0x400);
@@ -214,7 +236,6 @@ static void stm32l4x5_soc_realize(DeviceState *dev_soc, Error **errp)
     /* RESERVED:    0x40009800, 0x6800 */
 
     /* APB2 BUS */
-    create_unimplemented_device("SYSCFG",    0x40010000, 0x30);
     create_unimplemented_device("VREFBUF",   0x40010030, 0x1D0);
     create_unimplemented_device("COMP",      0x40010200, 0x200);
     /* RESERVED:    0x40010800, 0x1400 */
diff --git a/include/hw/arm/stm32l4x5_soc.h b/include/hw/arm/stm32l4x5_soc.h
index ac47158596..230348f847 100644
--- a/include/hw/arm/stm32l4x5_soc.h
+++ b/include/hw/arm/stm32l4x5_soc.h
@@ -37,6 +37,7 @@
 #include "qemu/units.h"
 #include "hw/qdev-core.h"
 #include "hw/arm/armv7m.h"
+#include "hw/misc/stm32l4x5_syscfg.h"
 #include "hw/misc/stm32l4x5_exti.h"
 #include "qom/object.h"
 
@@ -52,6 +53,7 @@ struct Stm32l4x5SocState {
     ARMv7MState armv7m;
 
     Stm32l4x5ExtiState exti;
+    Stm32l4x5SyscfgState syscfg;
 
     MemoryRegion sram1;
     MemoryRegion sram2;
-- 
2.38.5