nvmem: Defining cells on mtd created by mtdparts
sven at narfation.org
Mon Oct 11 00:06:56 PDT 2021
On Sunday, 10 October 2021 14:53:13 CEST Sven Eckelmann wrote:
> Since there are most likely more devices out there which use mtdparts, I would
> guess that there might already be a strategy out there which can be used to
> define the nvmem-provider for mtdparts defined partitions. At least I saw that
> Bartosz Golaszewski added all the mtd devices automatically as nvmem provider
> in c4dfa25ab307 ("mtd: add support for reading MTD devices via the nvmem
> API"). So there might also be something for nvmem-cells to find the correct
> mtd instead of relying on the fixed-partitions registration + of_node (which
> doesn't exist because it comes from mtdparts and not devicetree).
Ansuel Smith just proposed in OpenWrt  a workaround. It basically adds a
minimal fixed-partitions parser to the mtd cmdlinepart parser (responsible for
the mtdparts=) that tries to find the matching (size + offset) fixed-partition
from the devicetree. The code in mtd_device_parse_register
(add_mtd_partitions -> add_mtd_device -> mtd_nvmem_add) will then
automatically take care of the rest.
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