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kernel: backport mtd support for subpartitions in DT

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This is a new & warm feature that allows nesting partiitons in DT and
mixing their types (e.g. static vs. dynamic). It's very useful for
boards that have most partitions static but some of them require extra
parsing (e.g. a "firmware" partition).

It's required to successfully backport support for new devices using
that new syntax in their DT files.

Since brcm63xx has a custom alternative patch the upstream one is being
reverted for it. The plan is to make brcm63xx use the upstream
implementation.

Signed-off-by: Rafał Miłecki <rafal@milecki.pl>
This commit is contained in:
Rafał Miłecki
2018-07-27 21:54:08 +02:00
parent 4c1aa64b4d
commit 2a598bbaa3
18 changed files with 402 additions and 36 deletions
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10
target/linux/generic/pending-4.14/400-mtd-add-rootfs-split-support.patch
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@@ -60,7 +60,7 @@ Signed-off-by: Felix Fietkau <nbd@nbd.name>
/*
* Given a pointer to the MTD object in the mtd_part structure, we can retrieve
* the pointer to that structure.
@@ -674,6 +678,7 @@ int mtd_add_partition(struct mtd_info *p
@@ -658,6 +662,7 @@ int mtd_add_partition(struct mtd_info *p
mutex_unlock(&mtd_partitions_mutex);
add_mtd_device(&new->mtd);
@@ -68,7 +68,7 @@ Signed-off-by: Felix Fietkau <nbd@nbd.name>
mtd_add_partition_attrs(new);
@@ -752,6 +757,35 @@ int mtd_del_partition(struct mtd_info *m
@@ -736,6 +741,35 @@ int mtd_del_partition(struct mtd_info *m
}
EXPORT_SYMBOL_GPL(mtd_del_partition);
@@ -104,14 +104,14 @@ Signed-off-by: Felix Fietkau <nbd@nbd.name>
/*
* This function, given a master MTD object and a partition table, creates
* and registers slave MTD objects which are bound to the master according to
@@ -783,6 +817,7 @@ int add_mtd_partitions(struct mtd_info *
@@ -767,6 +801,7 @@ int add_mtd_partitions(struct mtd_info *
mutex_unlock(&mtd_partitions_mutex);
add_mtd_device(&slave->mtd);
+ mtd_partition_split(master, slave);
mtd_add_partition_attrs(slave);
if (parts[i].types)
mtd_parse_part(slave, parts[i].types);
/* Look for subpartitions */
parse_mtd_partitions(&slave->mtd, parts[i].types, NULL);
--- a/include/linux/mtd/partitions.h
+++ b/include/linux/mtd/partitions.h
@@ -110,5 +110,7 @@ int mtd_add_partition(struct mtd_info *m