lkml.org 
[lkml]   [2022]   [Jun]   [9]   [last100]   RSS Feed
Views: [wrap][no wrap]   [headers]  [forward] 
 
Messages in this thread
/
Date
From
SubjectRe: [PATCH v5 1/3] dt-bindings: mtd: partitions: Support label only partition
On Mon, Jun 06, 2022 at 05:14:15PM +0200, Ansuel Smith wrote:
> Document new partition nodes that declare only the label instead of the
> reg used to provide an OF node for partition registred at runtime by
> parsers. This is required for nvmem system to declare and detect
> nvmem-cells.
>
> With these special partitions, the reg / offset is not required.
> The label binding is used to match the partition allocated by the
> parser at runtime and the parser will provide reg and offset of the mtd.
>
> NVMEM will use the data from the parser and provide the NVMEM cells
> declared in the DTS, "connecting" the dynamic partition with a
> static declaration of cells in them.
>
> Signed-off-by: Ansuel Smith <ansuelsmth@gmail.com>
> ---
> .../bindings/mtd/partitions/partition.yaml | 16 ++++++++++++++--
> 1 file changed, 14 insertions(+), 2 deletions(-)
>
> diff --git a/Documentation/devicetree/bindings/mtd/partitions/partition.yaml b/Documentation/devicetree/bindings/mtd/partitions/partition.yaml
> index e1ac08064425..bff6fb980e6b 100644
> --- a/Documentation/devicetree/bindings/mtd/partitions/partition.yaml
> +++ b/Documentation/devicetree/bindings/mtd/partitions/partition.yaml
> @@ -11,6 +11,13 @@ description: |
> relative offset and size specified. Depending on partition function extra
> properties can be used.
>
> + A partition may be dynamically allocated by a specific parser at runtime.
> + In this specific case, the label is required instead of the reg.
> + This is used to assign an OF node to the dynamiccally allocated partition
> + so that subsystem like NVMEM can provide an OF node and declare NVMEM cells.
> + The OF node will be assigned only if the partition label declared match the
> + one assigned by the parser at runtime.
> +
> maintainers:
> - Rafał Miłecki <rafal@milecki.pl>
>
> @@ -22,6 +29,8 @@ properties:
> label:
> description: The label / name for this partition. If omitted, the label
> is taken from the node name (excluding the unit address).
> + With dynamically allocated partition the label is required and won't
> + fallback to the node name.

Generally, label is never required being something for humans rather
than the s/w to consume. I don't see any reason why we can't still use
the node name (with 'partition-' stripped off).

If the purpose is to define what the partition contains, then
'compatible' is the right thing for that.

>
> read-only:
> description: This parameter, if present, is a hint that this partition
> @@ -41,7 +50,10 @@ properties:
> immune to paired-pages corruptions
> type: boolean
>
> -required:
> - - reg
> +if:
> + not:
> + required: [ reg ]
> +then:
> + required: [ label ]
>
> additionalProperties: true
> --
> 2.36.1
>
>

\
 
 \ /
  Last update: 2022-06-09 20:34    [W:0.430 / U:2.540 seconds]
©2003-2020 Jasper Spaans|hosted at Digital Ocean and TransIP|Read the blog|Advertise on this site