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mtd: mtdpart: Support MTDPART_SIZ_FULL in fixed-partitions

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Flash partitions may specify MTDPART_SIZ_FULL (=0) as the size of the
partition to indicate "the remainder of the flash". Make this work with
device-tree "fixed-partitions" as well.

This makes MTD partitioning compatible with the Linux kernel, see:
  https://github.com/torvalds/linux/blob/master/include/linux/mtd/partitions.h#L29
  https://github.com/torvalds/linux/blob/master/drivers/mtd/mtdpart.c#L123

Previously, this could only be done through MTDPARTS so this change allows
boards like topic_miami to migrate from `mtdparts`/`mtdids` to devicetree
partitions.

Signed-off-by: Mike Looijmans <mike.looijmans@topic.nl>
Reviewed-by: Michael Trimarchi <michael@amarulasolutions.com>
This commit is contained in:
Mike Looijmans 2025-04-08 07:46:38 +02:00 committed by Tom Rini
parent aa96cda0a5
commit 98a898e584
1 changed files with 4 additions and 2 deletions
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6
drivers/mtd/mtdpart.c
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@ -909,11 +909,13 @@ int add_mtd_partitions_of(struct mtd_info *master)
continue;
offset = ofnode_get_addr_size_index_notrans(child, 0, &size);
if (offset == FDT_ADDR_T_NONE || !size) {
debug("Missing partition offset/size on \"%s\" partition\n",
if (offset == FDT_ADDR_T_NONE) {
debug("Missing partition offset on \"%s\" partition\n",
master->name);
continue;
}
if (size == MTDPART_SIZ_FULL)
size = master->size - offset;
part.name = ofnode_read_string(child, "label");
if (!part.name)