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>
(cherry picked from commit e90e75b12c818c49704755b9e530491aee2d554c)

10 files changed, 260 insertions, 11 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) {
diff --git a/target/linux/generic/pending-5.4/405-0001-mtd-core-add-nvmem-cells-compatible-to-parse-mtd-as-.patch b/target/linux/generic/pending-5.4/405-0001-mtd-core-add-nvmem-cells-compatible-to-parse-mtd-as-.patch
new file mode 100644
index 0000000000..25801e4686
--- /dev/null
+++ b/target/linux/generic/pending-5.4/405-0001-mtd-core-add-nvmem-cells-compatible-to-parse-mtd-as-.patch
@@ -0,0 +1,38 @@
+From a5d83d6e2bc747b13f347962d4b335d70b23559b Mon Sep 17 00:00:00 2001
+From: Ansuel Smith <ansuelsmth@gmail.com>
+Date: Fri, 12 Mar 2021 07:28:19 +0100
+Subject: [PATCH] mtd: core: add nvmem-cells compatible to parse mtd as nvmem
+ cells
+MIME-Version: 1.0
+Content-Type: text/plain; charset=UTF-8
+Content-Transfer-Encoding: 8bit
+
+Partitions that contains the nvmem-cells compatible will register
+their direct subonodes as nvmem cells and the node will be treated as a
+nvmem provider.
+
+Signed-off-by: Ansuel Smith <ansuelsmth@gmail.com>
+Tested-by: Rafał Miłecki <rafal@milecki.pl>
+---
+ drivers/mtd/mtdcore.c | 3 ++-
+ 1 file changed, 2 insertions(+), 1 deletion(-)
+
+--- a/drivers/mtd/mtdcore.c
++++ b/drivers/mtd/mtdcore.c
+@@ -559,6 +559,7 @@ static int mtd_nvmem_reg_read(void *priv
+ 
+ static int mtd_nvmem_add(struct mtd_info *mtd)
+ {
++	struct device_node *node = mtd_get_of_node(mtd);
+ 	struct nvmem_config config = {};
+ 
+ 	config.id = -1;
+@@ -571,7 +572,7 @@ static int mtd_nvmem_add(struct mtd_info
+ 	config.stride = 1;
+ 	config.read_only = true;
+ 	config.root_only = true;
+-	config.no_of_node = true;
++	config.no_of_node = !of_device_is_compatible(node, "nvmem-cells");
+ 	config.priv = mtd;
+ 
+ 	mtd->nvmem = nvmem_register(&config);
diff --git a/target/linux/generic/pending-5.4/405-0002-devicetree-nvmem-nvmem-drop-nodename-restriction.patch b/target/linux/generic/pending-5.4/405-0002-devicetree-nvmem-nvmem-drop-nodename-restriction.patch
new file mode 100644
index 0000000000..14ea3f6b8c
--- /dev/null
+++ b/target/linux/generic/pending-5.4/405-0002-devicetree-nvmem-nvmem-drop-nodename-restriction.patch
@@ -0,0 +1,25 @@
+From 42645976c3289b03a12f1bd2bc131fd98fc27170 Mon Sep 17 00:00:00 2001
+From: Ansuel Smith <ansuelsmth@gmail.com>
+Date: Fri, 12 Mar 2021 07:28:20 +0100
+Subject: [PATCH] devicetree: nvmem: nvmem: drop $nodename restriction
+
+Drop $nodename restriction as now mtd partition can also be used as
+nvmem provider.
+
+Signed-off-by: Ansuel Smith <ansuelsmth@gmail.com>
+---
+ Documentation/devicetree/bindings/nvmem/nvmem.yaml | 3 ---
+ 1 file changed, 3 deletions(-)
+
+--- a/Documentation/devicetree/bindings/nvmem/nvmem.yaml
++++ b/Documentation/devicetree/bindings/nvmem/nvmem.yaml
+@@ -20,9 +20,6 @@ description: |
+   storage device.
+ 
+ properties:
+-  $nodename:
+-    pattern: "^(eeprom|efuse|nvram)(@.*|-[0-9a-f])*$"
+-
+   "#address-cells":
+     const: 1
+ 
diff --git a/target/linux/generic/pending-5.4/405-0003-dt-bindings-mtd-Document-use-of-nvmem-cells-compatib.patch b/target/linux/generic/pending-5.4/405-0003-dt-bindings-mtd-Document-use-of-nvmem-cells-compatib.patch
new file mode 100644
index 0000000000..0eb4c637cf
--- /dev/null
+++ b/target/linux/generic/pending-5.4/405-0003-dt-bindings-mtd-Document-use-of-nvmem-cells-compatib.patch
@@ -0,0 +1,117 @@
+From 377aa0135dc8489312edd3184d143ce3a89ff7ee Mon Sep 17 00:00:00 2001
+From: Ansuel Smith <ansuelsmth@gmail.com>
+Date: Fri, 12 Mar 2021 07:28:21 +0100
+Subject: [PATCH] dt-bindings: mtd: Document use of nvmem-cells compatible
+
+Document nvmem-cells compatible used to treat mtd partitions as a
+nvmem provider.
+
+Signed-off-by: Ansuel Smith <ansuelsmth@gmail.com>
+Reviewed-by: Rob Herring <robh@kernel.org>
+---
+ .../bindings/mtd/partitions/nvmem-cells.yaml  | 99 +++++++++++++++++++
+ 1 file changed, 99 insertions(+)
+ create mode 100644 Documentation/devicetree/bindings/mtd/partitions/nvmem-cells.yaml
+
+--- /dev/null
++++ b/Documentation/devicetree/bindings/mtd/partitions/nvmem-cells.yaml
+@@ -0,0 +1,99 @@
++# SPDX-License-Identifier: GPL-2.0-only OR BSD-2-Clause
++%YAML 1.2
++---
++$id: http://devicetree.org/schemas/mtd/partitions/nvmem-cells.yaml#
++$schema: http://devicetree.org/meta-schemas/core.yaml#
++
++title: Nvmem cells
++
++description: |
++  Any partition containing the compatible "nvmem-cells" will register as a
++  nvmem provider.
++  Each direct subnodes represents a nvmem cell following the nvmem binding.
++  Nvmem binding to declare nvmem-cells can be found in:
++  Documentation/devicetree/bindings/nvmem/nvmem.yaml
++
++maintainers:
++  - Ansuel Smith <ansuelsmth@gmail.com>
++
++allOf:
++  - $ref: /schemas/nvmem/nvmem.yaml#
++
++properties:
++  compatible:
++    const: nvmem-cells
++
++required:
++  - compatible
++
++additionalProperties: true
++
++examples:
++  - |
++    partitions {
++      compatible = "fixed-partitions";
++      #address-cells = <1>;
++      #size-cells = <1>;
++
++      /* ... */
++
++      };
++      art: art@1200000 {
++        compatible = "nvmem-cells";
++        reg = <0x1200000 0x0140000>;
++        label = "art";
++        read-only;
++        #address-cells = <1>;
++        #size-cells = <1>;
++
++        macaddr_gmac1: macaddr_gmac1@0 {
++          reg = <0x0 0x6>;
++        };
++
++        macaddr_gmac2: macaddr_gmac2@6 {
++          reg = <0x6 0x6>;
++        };
++
++        pre_cal_24g: pre_cal_24g@1000 {
++          reg = <0x1000 0x2f20>;
++        };
++
++        pre_cal_5g: pre_cal_5g@5000{
++          reg = <0x5000 0x2f20>;
++        };
++      };
++  - |
++    partitions {
++        compatible = "fixed-partitions";
++        #address-cells = <1>;
++        #size-cells = <1>;
++
++        partition@0 {
++            label = "bootloader";
++            reg = <0x000000 0x100000>;
++            read-only;
++        };
++
++        firmware@100000 {
++            compatible = "brcm,trx";
++            label = "firmware";
++            reg = <0x100000 0xe00000>;
++        };
++
++        calibration@f00000 {
++            compatible = "nvmem-cells";
++            label = "calibration";
++            reg = <0xf00000 0x100000>;
++            ranges = <0 0xf00000 0x100000>;
++            #address-cells = <1>;
++            #size-cells = <1>;
++
++            wifi0@0 {
++                reg = <0x000000 0x080000>;
++            };
++
++            wifi1@80000 {
++                reg = <0x080000 0x080000>;
++            };
++        };
++    };
diff --git a/target/linux/generic/pending-5.4/480-mtd-set-rootfs-to-be-root-dev.patch b/target/linux/generic/pending-5.4/480-mtd-set-rootfs-to-be-root-dev.patch
index 3907ac2368..95863d6edb 100644
--- a/target/linux/generic/pending-5.4/480-mtd-set-rootfs-to-be-root-dev.patch
+++ b/target/linux/generic/pending-5.4/480-mtd-set-rootfs-to-be-root-dev.patch
@@ -20,7 +20,7 @@ Signed-off-by: Gabor Juhos <juhosg@openwrt.org>
  #include <linux/nvmem-provider.h>
  
  #include <linux/mtd/mtd.h>
-@@ -698,6 +699,15 @@ int add_mtd_device(struct mtd_info *mtd)
+@@ -699,6 +700,15 @@ int add_mtd_device(struct mtd_info *mtd)
  	   of this try_ nonsense, and no bitching about it
  	   either. :) */
  	__module_get(THIS_MODULE);
diff --git a/target/linux/generic/pending-5.4/495-mtd-core-add-get_mtd_device_by_node.patch b/target/linux/generic/pending-5.4/495-mtd-core-add-get_mtd_device_by_node.patch
index 3a118e38fe..b6e36410e7 100644
--- a/target/linux/generic/pending-5.4/495-mtd-core-add-get_mtd_device_by_node.patch
+++ b/target/linux/generic/pending-5.4/495-mtd-core-add-get_mtd_device_by_node.patch
@@ -17,7 +17,7 @@ Reviewed-by: Miquel Raynal <miquel.raynal@bootlin.com>
 
 --- a/drivers/mtd/mtdcore.c
 +++ b/drivers/mtd/mtdcore.c
-@@ -1049,6 +1049,44 @@ out_unlock:
+@@ -1050,6 +1050,44 @@ out_unlock:
  }
  EXPORT_SYMBOL_GPL(get_mtd_device_nm);
  
diff --git a/target/linux/kirkwood/patches-5.4/202-linksys-find-active-root.patch b/target/linux/kirkwood/patches-5.4/202-linksys-find-active-root.patch
index cc35583b98..3077e718c3 100644
--- a/target/linux/kirkwood/patches-5.4/202-linksys-find-active-root.patch
+++ b/target/linux/kirkwood/patches-5.4/202-linksys-find-active-root.patch
@@ -22,7 +22,7 @@ Signed-off-by: Imre Kaloz <kaloz@openwrt.org>
  	const char *partname;
  	struct device_node *pp;
  	int nr_parts, i, ret = 0;
-@@ -124,9 +127,15 @@ static int parse_fixed_partitions(struct
+@@ -126,9 +129,15 @@ static int parse_fixed_partitions(struct
  		parts[i].size = of_read_number(reg + a_cells, s_cells);
  		parts[i].of_node = pp;
  
@@ -41,7 +41,7 @@ Signed-off-by: Imre Kaloz <kaloz@openwrt.org>
  		parts[i].name = partname;
  
  		if (of_get_property(pp, "read-only", &len))
-@@ -239,6 +248,18 @@ static int __init ofpart_parser_init(voi
+@@ -241,6 +250,18 @@ static int __init ofpart_parser_init(voi
  	return 0;
  }
  
diff --git a/target/linux/lantiq/patches-5.4/0101-find_active_root.patch b/target/linux/lantiq/patches-5.4/0101-find_active_root.patch
index d541cc247c..201cdd3f87 100644
--- a/target/linux/lantiq/patches-5.4/0101-find_active_root.patch
+++ b/target/linux/lantiq/patches-5.4/0101-find_active_root.patch
@@ -48,7 +48,7 @@
  
  	/* Pull of_node from the master device node */
  	mtd_node = mtd_get_of_node(master);
-@@ -86,7 +120,9 @@ static int parse_fixed_partitions(struct
+@@ -88,7 +122,9 @@ static int parse_fixed_partitions(struct
  		return 0;
  
  	parts = kcalloc(nr_parts, sizeof(*parts), GFP_KERNEL);
@@ -59,7 +59,7 @@
  		return -ENOMEM;
  
  	i = 0;
-@@ -135,6 +171,11 @@ static int parse_fixed_partitions(struct
+@@ -137,6 +173,11 @@ static int parse_fixed_partitions(struct
  		if (of_get_property(pp, "lock", &len))
  			parts[i].mask_flags |= MTD_POWERUP_LOCK;
  
@@ -71,7 +71,7 @@
  		i++;
  	}
  
-@@ -144,6 +185,11 @@ static int parse_fixed_partitions(struct
+@@ -146,6 +187,11 @@ static int parse_fixed_partitions(struct
  	if (quirks && quirks->post_parse)
  		quirks->post_parse(master, parts, nr_parts);
  
@@ -83,7 +83,7 @@
  	*pparts = parts;
  	return nr_parts;
  
-@@ -154,6 +200,7 @@ ofpart_fail:
+@@ -156,6 +202,7 @@ ofpart_fail:
  ofpart_none:
  	of_node_put(pp);
  	kfree(parts);
diff --git a/target/linux/mvebu/patches-5.4/400-find_active_root.patch b/target/linux/mvebu/patches-5.4/400-find_active_root.patch
index 8475bec925..6ac777a1d2 100644
--- a/target/linux/mvebu/patches-5.4/400-find_active_root.patch
+++ b/target/linux/mvebu/patches-5.4/400-find_active_root.patch
@@ -22,7 +22,7 @@ Signed-off-by: Imre Kaloz <kaloz@openwrt.org>
  	struct device_node *pp;
  	int nr_parts, i, ret = 0;
  	bool dedicated = true;
-@@ -124,9 +127,13 @@ static int parse_fixed_partitions(struct
+@@ -126,9 +129,13 @@ static int parse_fixed_partitions(struct
  		parts[i].size = of_read_number(reg + a_cells, s_cells);
  		parts[i].of_node = pp;
  
@@ -39,7 +39,7 @@ Signed-off-by: Imre Kaloz <kaloz@openwrt.org>
  		parts[i].name = partname;
  
  		if (of_get_property(pp, "read-only", &len))
-@@ -239,6 +246,18 @@ static int __init ofpart_parser_init(voi
+@@ -241,6 +248,18 @@ static int __init ofpart_parser_init(voi
  	return 0;
  }
  
diff --git a/target/linux/pistachio/patches-5.4/401-mtd-nor-support-mtd-name-from-device-tree.patch b/target/linux/pistachio/patches-5.4/401-mtd-nor-support-mtd-name-from-device-tree.patch
index 2d0b1cc634..69a8303d2b 100644
--- a/target/linux/pistachio/patches-5.4/401-mtd-nor-support-mtd-name-from-device-tree.patch
+++ b/target/linux/pistachio/patches-5.4/401-mtd-nor-support-mtd-name-from-device-tree.patch
@@ -34,7 +34,7 @@ Signed-off-by: Abhimanyu Vishwakarma <Abhimanyu.Vishwakarma@imgtec.com>
  	mtd->type = MTD_NORFLASH;
 --- a/drivers/mtd/mtdcore.c
 +++ b/drivers/mtd/mtdcore.c
-@@ -778,6 +778,17 @@ out_error:
+@@ -779,6 +779,17 @@ out_error:
   */
  static void mtd_set_dev_defaults(struct mtd_info *mtd)
  {