virtio: add HAS_IOMEM dependency to MMIO platform bus driver

Fix this compile error on s390:

  CC [M]  drivers/virtio/virtio_mmio.o
drivers/virtio/virtio_mmio.c: In function 'vm_get_features':
drivers/virtio/virtio_mmio.c:107:2: error: implicit declaration of function 'writel'

Cc: Christian Borntraeger <borntraeger@de.ibm.com>
Signed-off-by: Heiko Carstens <heiko.carstens@de.ibm.com>
Acked-by: Pawel Moll <pawel.moll@arm.com>
Signed-off-by: Rusty Russell <rusty@rustcorp.com.au>

1 files changed, 1 insertions, 1 deletions

diff --git a/drivers/virtio/Kconfig b/drivers/virtio/Kconfig
index 816ed08e7cf3..1a61939b85fc 100644
--- a/drivers/virtio/Kconfig
+++ b/drivers/virtio/Kconfig
@@ -37,7 +37,7 @@ config VIRTIO_BALLOON
 
  config VIRTIO_MMIO
         tristate "Platform bus driver for memory mapped virtio devices (EXPERIMENTAL)"
-        depends on EXPERIMENTAL
+        depends on HAS_IOMEM && EXPERIMENTAL
         select VIRTIO
         select VIRTIO_RING
         ---help---