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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>
This commit is contained in:
Michal Suchanek 2015-10-28 15:48:06 -07:00 committed by Brian Norris
parent 4d1ea982a9
commit fe2585e9c2
1 changed files with 42 additions and 29 deletions
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71
Documentation/devicetree/bindings/mtd/partition.txt
View File

@ -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>;
};
};
};