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102 lines
3.5 KiB
102 lines
3.5 KiB
From 76a832254ab05502c9394cc51ded6f0abe0e0bee Mon Sep 17 00:00:00 2001
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From: =?UTF-8?q?Rafa=C5=82=20Mi=C5=82ecki?= <rafal@milecki.pl>
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Date: Fri, 13 Jul 2018 16:32:21 +0200
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Subject: [PATCH] mtd: partitions: use DT info for parsing partitions with
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"compatible" prop
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MIME-Version: 1.0
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Content-Type: text/plain; charset=UTF-8
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Content-Transfer-Encoding: 8bit
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So far only flash devices could be described in DT regarding partitions
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parsing. That could be done with "partitions" subnode and a proper
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"compatible" string.
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Some devices may use hierarchical (multi-level) layouts and may mix used
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layouts (fixed and dynamic). Describing that in DT is done by specifying
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"compatible" for DT-represented partition plus optionally more
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properties and/or subnodes.
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To support such layouts each DT partition has to be checked for
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additional description.
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Please note this implementation will work in parallel with support for
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partition type specified for non-DT setups. That already works since
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commit 1a0915be1926 ("mtd: partitions: add support for partition
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parsers").
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Signed-off-by: Rafał Miłecki <rafal@milecki.pl>
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Signed-off-by: Boris Brezillon <boris.brezillon@bootlin.com>
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---
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drivers/mtd/mtdpart.c | 33 +++++++++++++--------------------
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1 file changed, 13 insertions(+), 20 deletions(-)
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--- a/drivers/mtd/mtdpart.c
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+++ b/drivers/mtd/mtdpart.c
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@@ -370,22 +370,6 @@ static inline void free_partition(struct
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kfree(p);
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}
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-/**
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- * mtd_parse_part - parse MTD partition looking for subpartitions
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- *
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- * @slave: part that is supposed to be a container and should be parsed
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- * @types: NULL-terminated array with names of partition parsers to try
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- *
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- * Some partitions are kind of containers with extra subpartitions (volumes).
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- * There can be various formats of such containers. This function tries to use
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- * specified parsers to analyze given partition and registers found
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- * subpartitions on success.
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- */
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-static int mtd_parse_part(struct mtd_part *slave, const char *const *types)
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-{
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- return parse_mtd_partitions(&slave->mtd, types, NULL);
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-}
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-
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static struct mtd_part *allocate_partition(struct mtd_info *parent,
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const struct mtd_partition *part, int partno,
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uint64_t cur_offset)
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@@ -803,8 +787,8 @@ int add_mtd_partitions(struct mtd_info *
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}
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mtd_add_partition_attrs(slave);
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- if (parts[i].types)
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- mtd_parse_part(slave, parts[i].types);
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+ /* Look for subpartitions */
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+ parse_mtd_partitions(&slave->mtd, parts[i].types, NULL);
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cur_offset = slave->offset + slave->mtd.size;
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}
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@@ -885,6 +869,12 @@ static const char * const default_mtd_pa
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NULL
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};
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+/* Check DT only when looking for subpartitions. */
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+static const char * const default_subpartition_types[] = {
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+ "ofpart",
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+ NULL
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+};
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+
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static int mtd_part_do_parse(struct mtd_part_parser *parser,
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struct mtd_info *master,
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struct mtd_partitions *pparts,
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@@ -955,7 +945,9 @@ static int mtd_part_of_parse(struct mtd_
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const char *fixed = "fixed-partitions";
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int ret, err = 0;
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- np = of_get_child_by_name(mtd_get_of_node(master), "partitions");
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+ np = mtd_get_of_node(master);
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+ if (!mtd_is_partition(master))
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+ np = of_get_child_by_name(np, "partitions");
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of_property_for_each_string(np, "compatible", prop, compat) {
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parser = mtd_part_get_compatible_parser(compat);
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if (!parser)
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@@ -1018,7 +1010,8 @@ int parse_mtd_partitions(struct mtd_info
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int ret, err = 0;
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if (!types)
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- types = default_mtd_part_types;
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+ types = mtd_is_partition(master) ? default_subpartition_types :
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+ default_mtd_part_types;
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for ( ; *types; types++) {
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/*
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