mtd: ofpart: support partitions of 4 GiB and larger

Previously, partitions were limited to less than 4 GiB in size because
the address and size were read as 32-bit values. Add support for 64-bit
values to support devices of 4 GiB and larger.

Signed-off-by: Joe Schaack <jschaack@xes-inc.com>
Signed-off-by: Nate Case <ncase@xes-inc.com>
Signed-off-by: Aaron Sierra <asierra@xes-inc.com>
Signed-off-by: Artem Bityutskiy <artem.bityutskiy@linux.intel.com>
Signed-off-by: David Woodhouse <David.Woodhouse@intel.com>

1 files changed, 34 insertions, 2 deletions

diff --git a/Documentation/devicetree/bindings/mtd/partition.txt b/Documentation/devicetree/bindings/mtd/partition.txt
index 6e1f61f1e789..9315ac96b49b 100644
--- a/Documentation/devicetree/bindings/mtd/partition.txt
+++ b/Documentation/devicetree/bindings/mtd/partition.txt
@@ -5,8 +5,12 @@ on platforms which have strong conventions about which portions of a flash are
 used for what purposes, but which don't use an on-flash partition table such
 as RedBoot.
 
-#address-cells & #size-cells must both be present in the mtd device and be
-equal to 1.
+#address-cells & #size-cells must both be present in the mtd device. There are
+two valid values for both:
+<1>: for partitions that require a single 32-bit cell to represent their
+     size/address (aka the value is below 4 GiB)
+<2>: for partitions that require two 32-bit cells to represent their
+     size/address (aka the value is 4 GiB or greater).
 
 Required properties:
 - reg : The partition's offset and size within the mtd bank.
@@ -36,3 +40,31 @@ flash@0 {
                 reg = <0x0100000 0x200000>;
         };
 };
+
+flash@1 {
+        #address-cells = <1>;
+        #size-cells = <2>;
+
+        /* a 4 GiB partition */
+        partition@0 {
+                label = "filesystem";
+                reg = <0x00000000 0x1 0x00000000>;
+        };
+};
+
+flash@2 {
+        #address-cells = <2>;
+        #size-cells = <2>;
+
+        /* an 8 GiB partition */
+        partition@0 {
+                label = "filesystem #1";
+                reg = <0x0 0x00000000 0x2 0x00000000>;
+        };
+
+        /* a 4 GiB partition */
+        partition@200000000 {
+                label = "filesystem #2";
+                reg = <0x2 0x00000000 0x1 0x00000000>;
+        };
+};