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mtd: core: try to find OF node for every MTD partition

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So far this feature was limited to the top-level "nvmem-cells" node.
There are multiple parsers creating partitions and subpartitions
dynamically. Extend that code to handle them too.

This allows finding partition-* node for every MTD (sub)partition.

Random example:

partitions {
	compatible = "brcm,bcm947xx-cfe-partitions";

	partition-firmware {
		compatible = "brcm,trx";

		partition-loader {
		};
	};
};

Cc: Christian Marangi <ansuelsmth@gmail.com>
Signed-off-by: Rafał Miłecki <rafal@milecki.pl>
Signed-off-by: Miquel Raynal <miquel.raynal@bootlin.com>
Link: https://lore.kernel.org/linux-mtd/20221004083710.27704-2-zajec5@gmail.com
This commit is contained in:
Rafał Miłecki 2022-10-04 10:37:10 +02:00 committed by Miquel Raynal
parent c5f5d0cd40
commit 2df11f0010
1 changed files with 5 additions and 12 deletions
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17
drivers/mtd/mtdcore.c
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@ -551,13 +551,11 @@ static void mtd_check_of_node(struct mtd_info *mtd)
struct device_node *partitions, *parent_dn, *mtd_dn = NULL;
const char *pname, *prefix = "partition-";
int plen, mtd_name_len, offset, prefix_len;
bool found = false;
/* Check if MTD already has a device node */
if (mtd_get_of_node(mtd))
return;
/* Check if a partitions node exist */
if (!mtd_is_partition(mtd))
return;
@ -565,7 +563,10 @@ static void mtd_check_of_node(struct mtd_info *mtd)
if (!parent_dn)
return;
partitions = of_get_child_by_name(parent_dn, "partitions");
if (mtd_is_partition(mtd->parent))
partitions = of_node_get(parent_dn);
else
partitions = of_get_child_by_name(parent_dn, "partitions");
if (!partitions)
goto exit_parent;
@ -589,19 +590,11 @@ static void mtd_check_of_node(struct mtd_info *mtd)
plen = strlen(pname) - offset;
if (plen == mtd_name_len &&
!strncmp(mtd->name, pname + offset, plen)) {
found = true;
mtd_set_of_node(mtd, mtd_dn);
break;
}
}
if (!found)
goto exit_partitions;
/* Set of_node only for nvmem */
if (of_device_is_compatible(mtd_dn, "nvmem-cells"))
mtd_set_of_node(mtd, mtd_dn);
exit_partitions:
of_node_put(partitions);
exit_parent:
of_node_put(parent_dn);