kernel: add pending mtd patches adding NVMEM support

It's meant to provide upstream support for mtd & NVMEM. It's required
e.g. for reading MAC address from mtd partition content. It seems to be
in a final shape so it's worth testing.

Signed-off-by: Rafał Miłecki <rafal@milecki.pl>

1 files changed, 69 insertions, 0 deletions

diff --git a/target/linux/generic/backport-5.4/404-v5.13-mtd-parsers-ofpart-limit-parsing-of-deprecated-DT-sy.patch b/target/linux/generic/backport-5.4/404-v5.13-mtd-parsers-ofpart-limit-parsing-of-deprecated-DT-sy.patch
new file mode 100644
index 0000000000..35058adba7
--- /dev/null
+++ b/target/linux/generic/backport-5.4/404-v5.13-mtd-parsers-ofpart-limit-parsing-of-deprecated-DT-sy.patch
@@ -0,0 +1,69 @@
+From 2d751203aacf86a1b301a188d8551c7da91043ab Mon Sep 17 00:00:00 2001
+From: =?UTF-8?q?Rafa=C5=82=20Mi=C5=82ecki?= <rafal@milecki.pl>
+Date: Tue, 2 Mar 2021 20:00:12 +0100
+Subject: [PATCH] mtd: parsers: ofpart: limit parsing of deprecated DT syntax
+MIME-Version: 1.0
+Content-Type: text/plain; charset=UTF-8
+Content-Transfer-Encoding: 8bit
+
+For backward compatibility ofpart still supports the old syntax like:
+spi-flash@0 {
+	compatible = "jedec,spi-nor";
+	reg = <0x0>;
+
+	partition@0 {
+		label = "bootloader";
+		reg = <0x0 0x100000>;
+	};
+};
+(without "partitions" subnode).
+
+There is no reason however to support nested partitions without a clear
+"compatible" string like:
+partitions {
+	compatible = "fixed-partitions";
+	#address-cells = <1>;
+	#size-cells = <1>;
+
+	partition@0 {
+		label = "bootloader";
+		reg = <0x0 0x100000>;
+
+		partition@0 {
+			label = "config";
+			reg = <0x80000 0x80000>;
+		};
+	};
+};
+(we never officially supported or documented that).
+
+Make sure ofpart doesn't attempt to parse above.
+
+Cc: Ansuel Smith <ansuelsmth@gmail.com>
+Signed-off-by: Rafał Miłecki <rafal@milecki.pl>
+Signed-off-by: Miquel Raynal <miquel.raynal@bootlin.com>
+Link: https://lore.kernel.org/linux-mtd/20210302190012.1255-1-zajec5@gmail.com
+---
+ drivers/mtd/parsers/ofpart_core.c | 4 +++-
+ 1 file changed, 3 insertions(+), 1 deletion(-)
+
+--- a/drivers/mtd/parsers/ofpart_core.c
++++ b/drivers/mtd/parsers/ofpart_core.c
+@@ -53,7 +53,7 @@ static int parse_fixed_partitions(struct
+ 		return 0;
+ 
+ 	ofpart_node = of_get_child_by_name(mtd_node, "partitions");
+-	if (!ofpart_node) {
++	if (!ofpart_node && !mtd_is_partition(master)) {
+ 		/*
+ 		 * We might get here even when ofpart isn't used at all (e.g.,
+ 		 * when using another parser), so don't be louder than
+@@ -64,6 +64,8 @@ static int parse_fixed_partitions(struct
+ 		ofpart_node = mtd_node;
+ 		dedicated = false;
+ 	}
++	if (!ofpart_node)
++		return 0;
+ 
+ 	of_id = of_match_node(parse_ofpart_match_table, ofpart_node);
+ 	if (dedicated && !of_id) {