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-rw-r--r--Documentation/devicetree/bindings/mtd/partition.txt76
1 files changed, 47 insertions, 29 deletions
diff --git a/Documentation/devicetree/bindings/mtd/partition.txt b/Documentation/devicetree/bindings/mtd/partition.txt
index 8e5557da1..1c63e4065 100644
--- a/Documentation/devicetree/bindings/mtd/partition.txt
+++ b/Documentation/devicetree/bindings/mtd/partition.txt
@@ -4,10 +4,19 @@ 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:
+The partition table should be a subnode of the mtd node and should be named
+'partitions'. This node should have the following property:
+- compatible : (required) must be "fixed-partitions"
+Partitions are then defined in subnodes of the partitions node.
+
+For backwards compatibility partitions as direct subnodes of the mtd device are
+supported. This use is discouraged.
+NOTE: also for backwards compatibility, direct subnodes that have a compatible
+string are not considered partitions, as they may be used for other bindings.
+
+#address-cells & #size-cells must both be present in the partitions subnode of 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
@@ -28,44 +37,53 @@ Examples:
flash@0 {
- #address-cells = <1>;
- #size-cells = <1>;
+ partitions {
+ compatible = "fixed-partitions";
+ #address-cells = <1>;
+ #size-cells = <1>;
- partition@0 {
- label = "u-boot";
- reg = <0x0000000 0x100000>;
- read-only;
- };
+ partition@0 {
+ label = "u-boot";
+ reg = <0x0000000 0x100000>;
+ read-only;
+ };
- uimage@100000 {
- reg = <0x0100000 0x200000>;
+ uimage@100000 {
+ reg = <0x0100000 0x200000>;
+ };
};
};
flash@1 {
- #address-cells = <1>;
- #size-cells = <2>;
+ partitions {
+ compatible = "fixed-partitions";
+ #address-cells = <1>;
+ #size-cells = <2>;
- /* a 4 GiB partition */
- partition@0 {
- label = "filesystem";
- reg = <0x00000000 0x1 0x00000000>;
+ /* a 4 GiB partition */
+ partition@0 {
+ label = "filesystem";
+ reg = <0x00000000 0x1 0x00000000>;
+ };
};
};
flash@2 {
- #address-cells = <2>;
- #size-cells = <2>;
+ partitions {
+ compatible = "fixed-partitions";
+ #address-cells = <2>;
+ #size-cells = <2>;
- /* an 8 GiB partition */
- partition@0 {
- label = "filesystem #1";
- reg = <0x0 0x00000000 0x2 0x00000000>;
- };
+ /* 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>;
+ /* a 4 GiB partition */
+ partition@200000000 {
+ label = "filesystem #2";
+ reg = <0x2 0x00000000 0x1 0x00000000>;
+ };
};
};