hw/misc/pca9552: Add a 'description' property for debugging purpose

Add a description field to distinguish between multiple devices.
Reviewed-by: NCédric Le Goater <clg@kaod.org>
Signed-off-by: NPhilippe Mathieu-Daudé <f4bug@amsat.org>
Tested-by: NCédric Le Goater <clg@kaod.org>
Message-id: 20200623072723.6324-6-f4bug@amsat.org
Signed-off-by: NPeter Maydell <peter.maydell@linaro.org>

hw/misc/pca9552.c

@@ -13,6 +13,7 @@
 #include "qemu/osdep.h"
 #include "qemu/log.h"
 #include "qemu/module.h"
+#include "hw/qdev-properties.h"
 #include "hw/misc/pca9552.h"
 #include "hw/misc/pca9552_regs.h"
 #include "migration/vmstate.h"
@@ -317,13 +318,30 @@ static void pca955x_initfn(Object *obj)
     }
 }
 
+static void pca955x_realize(DeviceState *dev, Error **errp)
+{
+    PCA955xState *s = PCA955X(dev);
+
+    if (!s->description) {
+        s->description = g_strdup("pca-unspecified");
+    }
+}
+
+static Property pca955x_properties[] = {
+    DEFINE_PROP_STRING("description", PCA955xState, description),
+    DEFINE_PROP_END_OF_LIST(),
+};
+
 static void pca955x_class_init(ObjectClass *klass, void *data)
 {
+    DeviceClass *dc = DEVICE_CLASS(klass);
     I2CSlaveClass *k = I2C_SLAVE_CLASS(klass);
 
     k->event = pca955x_event;
     k->recv = pca955x_recv;
     k->send = pca955x_send;
+    dc->realize = pca955x_realize;
+    device_class_set_props(dc, pca955x_properties);
 }
 
 static const TypeInfo pca955x_info = {

include/hw/misc/pca9552.h

@@ -27,6 +27,7 @@ typedef struct PCA955xState {
     uint8_t pointer;
 
     uint8_t regs[PCA955X_NR_REGS];
+    char *description; /* For debugging purpose only */
 } PCA955xState;
 
 #endif