On Fri, 13 Jul 2018 16:32:20 +0200
Rafał Miłecki <zajec5@xxxxxxxxx> wrote:
> From: Rafał Miłecki <rafal@xxxxxxxxxx>
>
> Documentation was already saying that fixed and dynamic partitioning can
> be mixed but was missing a clear description and examples. This commit
> adds a proper documentation of how descriptions can be nested and how
> layouts can be mixed.
>
> This addition is important for partitions that contain subpartitions.
> In such cases partitions have to be properly described in order to let
> system handle them correctly.
>
> Depending on situation, nesting descriptions may provide more accurate
> logic/structure and/or allow mixing partitioning types (various
> "compatible" values).
>
> Signed-off-by: Rafał Miłecki <rafal@xxxxxxxxxx>
Applied both patches.
Thanks,
Boris
> ---
> V2: Rewrote example: I can include "brcm,trx" now as its Documentation
> has been pushed into mtd git tree.
> Updated commit message.
> ---
> .../devicetree/bindings/mtd/partition.txt | 46 ++++++++++++++++++++++
> 1 file changed, 46 insertions(+)
>
> diff --git a/Documentation/devicetree/bindings/mtd/partition.txt b/Documentation/devicetree/bindings/mtd/partition.txt
> index a8f382642ba9..afbbd870496d 100644
> --- a/Documentation/devicetree/bindings/mtd/partition.txt
> +++ b/Documentation/devicetree/bindings/mtd/partition.txt
> @@ -14,6 +14,13 @@ method is used for a given flash device. To describe the method there should be
> a subnode of the flash device that is named 'partitions'. It must have a
> 'compatible' property, which is used to identify the method to use.
>
> +When a single partition is represented with a DT node (it depends on a used
> +format) it may also be described using above rules ('compatible' and optionally
> +some extra properties / subnodes). It allows describing more complex,
> +hierarchical (multi-level) layouts and should be used if there is some
> +significant relation between partitions or some partition internally uses
> +another partitioning method.
> +
> Available bindings are listed in the "partitions" subdirectory.
>
>
> @@ -109,3 +116,42 @@ flash@2 {
> };
> };
> };
> +
> +flash@3 {
> + partitions {
> + compatible = "fixed-partitions";
> + #address-cells = <1>;
> + #size-cells = <1>;
> +
> + partition@0 {
> + label = "bootloader";
> + reg = <0x000000 0x100000>;
> + read-only;
> + };
> +
> + firmware@100000 {
> + label = "firmware";
> + reg = <0x100000 0xe00000>;
> + compatible = "brcm,trx";
> + };
> +
> + calibration@f00000 {
> + label = "calibration";
> + reg = <0xf00000 0x100000>;
> + compatible = "fixed-partitions";
> + ranges = <0 0xf00000 0x100000>;
> + #address-cells = <1>;
> + #size-cells = <1>;
> +
> + partition@0 {
> + label = "wifi0";
> + reg = <0x000000 0x080000>;
> + };
> +
> + partition@80000 {
> + label = "wifi1";
> + reg = <0x080000 0x080000>;
> + };
> + };
> + };
> +};
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