From fe2585e9c29a650af26824684e5033757fd6bc0c Mon Sep 17 00:00:00 2001 From: Michal Suchanek Date: Wed, 28 Oct 2015 15:48:06 -0700 Subject: 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 Acked-by: Rob Herring Signed-off-by: Brian Norris --- .../devicetree/bindings/mtd/partition.txt | 71 +++++++++++++--------- 1 file changed, 42 insertions(+), 29 deletions(-) (limited to 'Documentation/devicetree/bindings') diff --git a/Documentation/devicetree/bindings/mtd/partition.txt b/Documentation/devicetree/bindings/mtd/partition.txt index 8e5557da1955..f1e2a02381a4 100644 --- a/Documentation/devicetree/bindings/mtd/partition.txt +++ b/Documentation/devicetree/bindings/mtd/partition.txt @@ -4,10 +4,17 @@ 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'. Partitions are 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 +35,50 @@ Examples: flash@0 { - #address-cells = <1>; - #size-cells = <1>; + 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 { + #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 { + #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>; + }; }; }; -- cgit v1.2.3