VFIO: platform: add reset struct and lookup table

This patch introduces the vfio_platform_reset_combo struct that
stores all the information useful to handle the reset modality:
compat string, name of the reset function, name of the module that
implements the reset function. A lookup table of such structures
is added, currently void.
Signed-off-by: NEric Auger <eric.auger@linaro.org>
Acked-by: NBaptiste Reynal <b.reynal@virtualopensystems.com>
Tested-by: NBaptiste Reynal <b.reynal@virtualopensystems.com>
Signed-off-by: NAlex Williamson <alex.williamson@redhat.com>

drivers/vfio/platform/vfio_platform_common.c

@@ -25,6 +25,9 @@
 
 static DEFINE_MUTEX(driver_lock);
 
+static const struct vfio_platform_reset_combo reset_lookup_table[] = {
+};
+
 static int vfio_platform_regions_init(struct vfio_platform_device *vdev)
 {
 	int cnt = 0, i;

drivers/vfio/platform/vfio_platform_private.h

@@ -69,6 +69,12 @@ struct vfio_platform_device {
 	int	(*get_irq)(struct vfio_platform_device *vdev, int i);
 };
 
+struct vfio_platform_reset_combo {
+	const char *compat;
+	const char *reset_function_name;
+	const char *module_name;
+};
+
 extern int vfio_platform_probe_common(struct vfio_platform_device *vdev,
 				      struct device *dev);
 extern struct vfio_platform_device *vfio_platform_remove_common