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- 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)
- @@ -783,8 +767,8 @@ 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;
- }
- @@ -860,6 +844,12 @@ 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,
- @@ -930,7 +920,9 @@ 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)
- @@ -993,7 +985,8 @@ 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++) {
- /*
|
