Add the rt linux 4.1.3-rt3 as base

[kvmfornfv.git] / kernel / Documentation / devicetree / bindings / mtd / partition.txt

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+Representing flash partitions in devicetree
+
+Partitions can be represented by sub-nodes of an mtd device. This can be used
+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.
+NOTE: if the sub-node has a compatible string, then it is not a partition.
+
+#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.
+
+Optional properties:
+- label : The label / name for this partition.  If omitted, the label is taken
+  from the node name (excluding the unit address).
+- read-only : This parameter, if present, is a hint to Linux that this
+  partition should only be mounted read-only. This is usually used for flash
+  partitions containing early-boot firmware images or data which should not be
+  clobbered.
+
+Examples:
+
+
+flash@0 {
+       #address-cells = <1>;
+       #size-cells = <1>;
+
+       partition@0 {
+               label = "u-boot";
+               reg = <0x0000000 0x100000>;
+               read-only;
+       };
+
+       uimage@100000 {
+               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>;
+       };
+};