From d2ad00eb78792b396a6d012f15d6297a1701b8bc Mon Sep 17 00:00:00 2001 From: =?UTF-8?q?Rafa=C5=82=20Mi=C5=82ecki?= Date: Fri, 13 Jul 2018 16:32:20 +0200 Subject: dt-bindings: mtd: explicitly document nesting partitions descriptions MIME-Version: 1.0 Content-Type: text/plain; charset=UTF-8 Content-Transfer-Encoding: 8bit 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 Reviewed-by: Rob Herring Signed-off-by: Boris Brezillon --- .../devicetree/bindings/mtd/partition.txt | 46 ++++++++++++++++++++++ 1 file changed, 46 insertions(+) (limited to 'Documentation/devicetree/bindings/mtd') 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>; + }; + }; + }; +}; -- cgit v1.2.3