openwrtv4/target/linux/brcm63xx/patches-4.14/120-mtd-add-of_match_table-parsing-for-partition-parsers.patch

From 53980645bb12bd8723ac226805ee171780b24196 Mon Sep 17 00:00:00 2001
From: Jonas Gorski <jonas.gorski@gmail.com>
Date: Mon, 26 Jun 2017 13:37:11 +0200
Subject: [PATCH 1/4] mtd: add of_match_table parsing for partition parsers

Allow partition parsers to be matched by attaching compatible strings to
partitions.

This allows specifying the expected format of flash partitions for
matching partition parsers.

Example:

flash@foo {
	...
	partitions {
		compatible = "fixed-partitions";

		cfe@0 {
			reg = <0x0 0x10000>;
			label = "cfe";
			read-only;
		};

		firmware@10000 {
			reg = <0x10000 0x3e0000>;
			label = "firmware";
			compatible = "brcm,bcm63xx-imagetag";
		};

		nvram@3f0000 {
			reg = <0x3e0000 0x10000>;
			label = "nvram";
		};
	};
};

Signed-off-by: Jonas Gorski <jonas.gorski@gmail.com>
---
 drivers/mtd/mtdpart.c | 12 ++++++++----
 1 file changed, 8 insertions(+), 4 deletions(-)

--- a/drivers/mtd/mtdpart.c
+++ b/drivers/mtd/mtdpart.c
@@ -948,8 +948,7 @@ int add_mtd_partitions(struct mtd_info *
 		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);
+		mtd_parse_part(slave, parts[i].types);
 
 		cur_offset = slave->offset + slave->mtd.size;
 	}
@@ -1121,7 +1120,9 @@ 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)
@@ -1190,8 +1191,12 @@ int parse_mtd_partitions(struct mtd_info
 			types = types_of;
 	}
 
-	if (!types)
+	if (!types) {
+		if (mtd_is_partition(master))
+			return -ENOENT;
+
 		types = default_mtd_part_types;
+	}
 
 	for ( ; *types; types++) {
 		/*