Add device tree based discovery support.

Signed-off-by: Thomas Abraham <redacted>
---
?.../devicetree/bindings/mmc/synposis-dw-mshc.txt ? | ? 85 +++++++++
?drivers/mmc/host/dw_mmc-pltfm.c ? ? ? ? ? ? ? ? ? ?| ? 24 +++
?drivers/mmc/host/dw_mmc.c ? ? ? ? ? ? ? ? ? ? ? ? ?| ?181 +++++++++++++++++++-
?drivers/mmc/host/dw_mmc.h ? ? ? ? ? ? ? ? ? ? ? ? ?| ? 10 +
?include/linux/mmc/dw_mmc.h ? ? ? ? ? ? ? ? ? ? ? ? | ? ?2 +
?5 files changed, 296 insertions(+), 6 deletions(-)
?create mode 100644 Documentation/devicetree/bindings/mmc/synposis-dw-mshc.txt

diff --git a/Documentation/devicetree/bindings/mmc/synposis-dw-mshc.txt b/Documentation/devicetree/bindings/mmc/synposis-dw-mshc.txt
new file mode 100644
index 0000000..c1ed70e
--- /dev/null
+++ b/Documentation/devicetree/bindings/mmc/synposis-dw-mshc.txt

@@ -0,0 +1,85 @@
+* Synopsis Designware Mobile Storage Host Controller
+
+The Synopsis designware mobile storage host controller is used to interface
+a SoC with storage medium such as eMMC or SD/MMC cards.
+
+Required Properties:
+
+* compatible: should be one of the following
+ ? ? ? - synopsis,dw-mshc: for controllers compliant with synopsis dw-mshc.
+
+* reg: physical base address of the dw-mshc controller and size of its memory
+ ?region.
+
+* interrupts: interrupt specifier for the controller. The format and value of
+ ?the interrupt specifier depends on the interrupt parent for the controller.
+
+# Slots: The slot specific information are contained within child-nodes with
+ ?each child-node representing a supported slot. There should be atleast one
+ ?child node representing a card slot. The name of the slot child node should
+ ?be 'slot{n}' where n is the unique number of the slot connnected to the
+ ?controller. The following are optional properties which can be included in
+ ?the slot child node.