The symbol MHI_BUS_EP neither depends on HAS_IOMEM, nor on
INDIRECT_IOMEM. But, the function mhi_ep_ring_num_elems in
drivers/bus/mhi/ep/ring.c is using a IO memcpy operation. So, when
building for UM which doesn't have CONFIG_HAS_IOMEM=y, the build fails.

Reviewed-by: Yann Sionneau <ysionneau@kalrayinc.com>
Signed-off-by: Julian Vetter <jvetter@kalrayinc.com>
---
Changes for v8:
- New patch
---
 drivers/bus/mhi/ep/Kconfig | 1 +
 1 file changed, 1 insertion(+)

diff --git a/drivers/bus/mhi/ep/Kconfig b/drivers/bus/mhi/ep/Kconfig
index 90ab3b040672..dba95fb95eeb 100644
--- a/drivers/bus/mhi/ep/Kconfig
+++ b/drivers/bus/mhi/ep/Kconfig
@@ -1,5 +1,6 @@
 config MHI_BUS_EP
 	tristate "Modem Host Interface (MHI) bus Endpoint implementation"
+	depends on HAS_IOMEM || INDIRECT_IOMEM
 	help
 	  Bus driver for MHI protocol. Modem Host Interface (MHI) is a
 	  communication protocol used by a host processor to control
-- 
2.34.1