doc: dt: mtd: support partitions in a special 'partitions' subnode
To avoid conflict with other drivers using subnodes of the mtd device create only one ofpart-specific node rather than any number of arbitrary partition subnodes. Signed-off-by: Michal Suchanek <hramrach@gmail.com> Acked-by: Rob Herring <robh@kernel.org> Signed-off-by: Brian Norris <computersforpeace@gmail.com>
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@ -4,10 +4,17 @@ Partitions can be represented by sub-nodes of an mtd device. This can be used
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on platforms which have strong conventions about which portions of a flash are
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on platforms which have strong conventions about which portions of a flash are
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used for what purposes, but which don't use an on-flash partition table such
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used for what purposes, but which don't use an on-flash partition table such
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as RedBoot.
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as RedBoot.
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NOTE: if the sub-node has a compatible string, then it is not a partition.
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#address-cells & #size-cells must both be present in the mtd device. There are
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The partition table should be a subnode of the mtd node and should be named
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two valid values for both:
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'partitions'. Partitions are defined in subnodes of the partitions node.
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For backwards compatibility partitions as direct subnodes of the mtd device are
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supported. This use is discouraged.
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NOTE: also for backwards compatibility, direct subnodes that have a compatible
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string are not considered partitions, as they may be used for other bindings.
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#address-cells & #size-cells must both be present in the partitions subnode of the
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mtd device. There are two valid values for both:
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<1>: for partitions that require a single 32-bit cell to represent their
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<1>: for partitions that require a single 32-bit cell to represent their
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size/address (aka the value is below 4 GiB)
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size/address (aka the value is below 4 GiB)
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<2>: for partitions that require two 32-bit cells to represent their
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<2>: for partitions that require two 32-bit cells to represent their
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@ -28,6 +35,7 @@ Examples:
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flash@0 {
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flash@0 {
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partitions {
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#address-cells = <1>;
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#address-cells = <1>;
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#size-cells = <1>;
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#size-cells = <1>;
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@ -41,8 +49,10 @@ flash@0 {
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reg = <0x0100000 0x200000>;
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reg = <0x0100000 0x200000>;
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};
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};
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};
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};
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};
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flash@1 {
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flash@1 {
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partitions {
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#address-cells = <1>;
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#address-cells = <1>;
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#size-cells = <2>;
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#size-cells = <2>;
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@ -52,8 +62,10 @@ flash@1 {
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reg = <0x00000000 0x1 0x00000000>;
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reg = <0x00000000 0x1 0x00000000>;
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};
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};
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};
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};
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};
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flash@2 {
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flash@2 {
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partitions {
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#address-cells = <2>;
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#address-cells = <2>;
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#size-cells = <2>;
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#size-cells = <2>;
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@ -69,3 +81,4 @@ flash@2 {
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reg = <0x2 0x00000000 0x1 0x00000000>;
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reg = <0x2 0x00000000 0x1 0x00000000>;
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};
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};
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};
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};
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};
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