diff options
Diffstat (limited to 'target/linux/generic/backport-4.9/402-v4.19-mtd-partitions-use-DT-info-for-parsing-partitions-wi.patch')
| -rw-r--r-- | target/linux/generic/backport-4.9/402-v4.19-mtd-partitions-use-DT-info-for-parsing-partitions-wi.patch | 102 |
1 files changed, 102 insertions, 0 deletions
diff --git a/target/linux/generic/backport-4.9/402-v4.19-mtd-partitions-use-DT-info-for-parsing-partitions-wi.patch b/target/linux/generic/backport-4.9/402-v4.19-mtd-partitions-use-DT-info-for-parsing-partitions-wi.patch new file mode 100644 index 0000000000..4186f5599f --- /dev/null +++ b/target/linux/generic/backport-4.9/402-v4.19-mtd-partitions-use-DT-info-for-parsing-partitions-wi.patch @@ -0,0 +1,102 @@ +From 76a832254ab05502c9394cc51ded6f0abe0e0bee Mon Sep 17 00:00:00 2001 +From: =?UTF-8?q?Rafa=C5=82=20Mi=C5=82ecki?= <rafal@milecki.pl> +Date: Fri, 13 Jul 2018 16:32:21 +0200 +Subject: [PATCH] mtd: partitions: use DT info for parsing partitions with + "compatible" prop +MIME-Version: 1.0 +Content-Type: text/plain; charset=UTF-8 +Content-Transfer-Encoding: 8bit + +So far only flash devices could be described in DT regarding partitions +parsing. That could be done with "partitions" subnode and a proper +"compatible" string. + +Some devices may use hierarchical (multi-level) layouts and may mix used +layouts (fixed and dynamic). Describing that in DT is done by specifying +"compatible" for DT-represented partition plus optionally more +properties and/or subnodes. + +To support such layouts each DT partition has to be checked for +additional description. + +Please note this implementation will work in parallel with support for +partition type specified for non-DT setups. That already works since +commit 1a0915be1926 ("mtd: partitions: add support for partition +parsers"). + +Signed-off-by: Rafał Miłecki <rafal@milecki.pl> +Signed-off-by: Boris Brezillon <boris.brezillon@bootlin.com> +--- + drivers/mtd/mtdpart.c | 33 +++++++++++++-------------------- + 1 file changed, 13 insertions(+), 20 deletions(-) + +--- a/drivers/mtd/mtdpart.c ++++ b/drivers/mtd/mtdpart.c +@@ -370,22 +370,6 @@ static inline void free_partition(struct + kfree(p); + } + +-/** +- * mtd_parse_part - parse MTD partition looking for subpartitions +- * +- * @slave: part that is supposed to be a container and should be parsed +- * @types: NULL-terminated array with names of partition parsers to try +- * +- * Some partitions are kind of containers with extra subpartitions (volumes). +- * There can be various formats of such containers. This function tries to use +- * specified parsers to analyze given partition and registers found +- * subpartitions on success. +- */ +-static int mtd_parse_part(struct mtd_part *slave, const char *const *types) +-{ +- return parse_mtd_partitions(&slave->mtd, types, NULL); +-} +- + static struct mtd_part *allocate_partition(struct mtd_info *parent, + const struct mtd_partition *part, int partno, + uint64_t cur_offset) +@@ -775,8 +759,8 @@ int add_mtd_partitions(struct mtd_info * + + add_mtd_device(&slave->mtd); + 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); + + cur_offset = slave->offset + slave->mtd.size; + } +@@ -852,6 +836,12 @@ static const char * const default_mtd_pa + NULL + }; + ++/* Check DT only when looking for subpartitions. */ ++static const char * const default_subpartition_types[] = { ++ "ofpart", ++ NULL ++}; ++ + static int mtd_part_do_parse(struct mtd_part_parser *parser, + struct mtd_info *master, + struct mtd_partitions *pparts, +@@ -922,7 +912,9 @@ static int mtd_part_of_parse(struct mtd_ + const char *fixed = "fixed-partitions"; + int ret, err = 0; + +- np = of_get_child_by_name(mtd_get_of_node(master), "partitions"); ++ np = mtd_get_of_node(master); ++ if (!mtd_is_partition(master)) ++ np = of_get_child_by_name(np, "partitions"); + of_property_for_each_string(np, "compatible", prop, compat) { + parser = mtd_part_get_compatible_parser(compat); + if (!parser) +@@ -985,7 +977,8 @@ int parse_mtd_partitions(struct mtd_info + int ret, err = 0; + + if (!types) +- types = default_mtd_part_types; ++ types = mtd_is_partition(master) ? default_subpartition_types : ++ default_mtd_part_types; + + for ( ; *types; types++) { + /* |