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-rw-r--r--target/linux/generic/backport-4.9/402-v4.19-mtd-partitions-use-DT-info-for-parsing-partitions-wi.patch102
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++) {
+ /*