kernel: backport "ofpart" mtd parser upstream quirks support

This adds quirks support to the "ofpart" parser. It's required to
support fixed partitions that require some extra logic.

Right now only BCM4908 binding is supported (BCM4908 requires detecting
currently used "firmware" partition).

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

3 files changed, 0 insertions, 393 deletions

diff --git a/target/linux/bcm4908/patches-5.4/140-0001-dt-bindings-mtd-move-partition-binding-to-its-own-fi.patch b/target/linux/bcm4908/patches-5.4/140-0001-dt-bindings-mtd-move-partition-binding-to-its-own-fi.patch
deleted file mode 100644
index 1ad61d89f9..0000000000
--- a/target/linux/bcm4908/patches-5.4/140-0001-dt-bindings-mtd-move-partition-binding-to-its-own-fi.patch
+++ /dev/null
@@ -1,113 +0,0 @@
-From 4fdbaa5a3dbe761b231c13feaa53242aae3306cc Mon Sep 17 00:00:00 2001
-From: =?UTF-8?q?Rafa=C5=82=20Mi=C5=82ecki?= <rafal@milecki.pl>
-Date: Fri, 15 Jan 2021 15:23:02 +0100
-Subject: [PATCH 1/3] dt-bindings: mtd: move partition binding to its own file
-MIME-Version: 1.0
-Content-Type: text/plain; charset=UTF-8
-Content-Transfer-Encoding: 8bit
-
-Single partition binding is quite common and may be:
-1. Used by multiple parsers
-2. Extended for more specific cases
-
-Move it to separated file to avoid code duplication.
-
-Signed-off-by: Rafał Miłecki <rafal@milecki.pl>
----
- .../mtd/partitions/fixed-partitions.yaml      | 33 +------------
- .../bindings/mtd/partitions/partition.yaml    | 47 +++++++++++++++++++
- 2 files changed, 48 insertions(+), 32 deletions(-)
- create mode 100644 Documentation/devicetree/bindings/mtd/partitions/partition.yaml
-
---- a/Documentation/devicetree/bindings/mtd/partitions/fixed-partitions.yaml
-+++ b/Documentation/devicetree/bindings/mtd/partitions/fixed-partitions.yaml
-@@ -27,38 +27,7 @@ properties:
- 
- patternProperties:
-   "@[0-9a-f]+$":
--    description: node describing a single flash partition
--    type: object
--
--    properties:
--      reg:
--        description: partition's offset and size within the flash
--        maxItems: 1
--
--      label:
--        description: The label / name for this partition. If omitted, the label
--          is taken from the node name (excluding the unit address).
--
--      read-only:
--        description: This parameter, if present, is a hint that this partition
--          should only be mounted read-only. This is usually used for flash
--          partitions containing early-boot firmware images or data which should
--          not be clobbered.
--        type: boolean
--
--      lock:
--        description: Do not unlock the partition at initialization time (not
--          supported on all devices)
--        type: boolean
--
--      slc-mode:
--        description: This parameter, if present, allows one to emulate SLC mode
--          on a partition attached to an MLC NAND thus making this partition
--          immune to paired-pages corruptions
--        type: boolean
--
--    required:
--      - reg
-+    $ref: "partition.yaml#"
- 
- required:
-   - "#address-cells"
---- /dev/null
-+++ b/Documentation/devicetree/bindings/mtd/partitions/partition.yaml
-@@ -0,0 +1,47 @@
-+# SPDX-License-Identifier: GPL-2.0-only OR BSD-2-Clause
-+%YAML 1.2
-+---
-+$id: http://devicetree.org/schemas/mtd/partitions/partition.yaml#
-+$schema: http://devicetree.org/meta-schemas/core.yaml#
-+
-+title: Partition
-+
-+description: |
-+  This binding describes a single flash partition. Each partition must have its
-+  relative offset and size specified. Depending on partition function extra
-+  properties can be used.
-+
-+maintainers:
-+  - Rafał Miłecki <rafal@milecki.pl>
-+
-+properties:
-+  reg:
-+    description: partition's offset and size within the flash
-+    maxItems: 1
-+
-+  label:
-+    description: The label / name for this partition. If omitted, the label
-+      is taken from the node name (excluding the unit address).
-+
-+  read-only:
-+    description: This parameter, if present, is a hint that this partition
-+      should only be mounted read-only. This is usually used for flash
-+      partitions containing early-boot firmware images or data which should
-+      not be clobbered.
-+    type: boolean
-+
-+  lock:
-+    description: Do not unlock the partition at initialization time (not
-+      supported on all devices)
-+    type: boolean
-+
-+  slc-mode:
-+    description: This parameter, if present, allows one to emulate SLC mode
-+      on a partition attached to an MLC NAND thus making this partition
-+      immune to paired-pages corruptions
-+    type: boolean
-+
-+required:
-+  - reg
-+
-+additionalProperties: true
diff --git a/target/linux/bcm4908/patches-5.4/140-0002-dt-bindings-mtd-add-binding-from-BCM4908-partitions.patch b/target/linux/bcm4908/patches-5.4/140-0002-dt-bindings-mtd-add-binding-from-BCM4908-partitions.patch
deleted file mode 100644
index 4967e6c1e3..0000000000
--- a/target/linux/bcm4908/patches-5.4/140-0002-dt-bindings-mtd-add-binding-from-BCM4908-partitions.patch
+++ /dev/null
@@ -1,89 +0,0 @@
-From 4f740351484e88bcea3776578288b6ec400829c8 Mon Sep 17 00:00:00 2001
-From: =?UTF-8?q?Rafa=C5=82=20Mi=C5=82ecki?= <rafal@milecki.pl>
-Date: Fri, 15 Jan 2021 16:01:04 +0100
-Subject: [PATCH 2/3] dt-bindings: mtd: add binding from BCM4908 partitions
-MIME-Version: 1.0
-Content-Type: text/plain; charset=UTF-8
-Content-Transfer-Encoding: 8bit
-
-BCM4908 uses fixed partitions layout but function of some partitions may
-vary. Some devices use multiple firmware partitions and those should be
-marked to let system discover their purpose.
-
-Signed-off-by: Rafał Miłecki <rafal@milecki.pl>
----
- .../partitions/brcm,bcm4908-partitions.yaml   | 68 +++++++++++++++++++
- 1 file changed, 68 insertions(+)
- create mode 100644 Documentation/devicetree/bindings/mtd/partitions/brcm,bcm4908-partitions.yaml
-
---- /dev/null
-+++ b/Documentation/devicetree/bindings/mtd/partitions/brcm,bcm4908-partitions.yaml
-@@ -0,0 +1,68 @@
-+# SPDX-License-Identifier: GPL-2.0-only OR BSD-2-Clause
-+%YAML 1.2
-+---
-+$id: http://devicetree.org/schemas/mtd/partitions/brcm,bcm4908-partitions.yaml#
-+$schema: http://devicetree.org/meta-schemas/core.yaml#
-+
-+title: Broadcom BCM4908 partitioning
-+
-+description: |
-+  Broadcom BCM4908 CFE bootloader supports two firmware partitions. One is used
-+  for regular booting, the other is treated as fallback.
-+
-+  This binding allows defining all fixed partitions and marking those containing
-+  firmware. System can use that information e.g. for booting or flashing
-+  purposes.
-+
-+maintainers:
-+  - Rafał Miłecki <rafal@milecki.pl>
-+
-+properties:
-+  compatible:
-+    const: brcm,bcm4908-partitions
-+
-+  "#address-cells": true
-+
-+  "#size-cells": true
-+
-+patternProperties:
-+  "@[0-9a-f]+$":
-+    allOf:
-+      - $ref: "partition.yaml#"
-+      - properties:
-+          compatible:
-+            const: brcm,bcm4908-firmware
-+
-+required:
-+  - "#address-cells"
-+  - "#size-cells"
-+
-+additionalProperties: false
-+
-+examples:
-+  - |
-+    partitions {
-+        compatible = "brcm,bcm4908-partitions";
-+        #address-cells = <1>;
-+        #size-cells = <1>;
-+
-+        partition@0 {
-+            label = "cferom";
-+            reg = <0x0 0x100000>;
-+        };
-+
-+        partition@100000 {
-+            compatible = "brcm,bcm4908-firmware";
-+            reg = <0x100000 0xf00000>;
-+        };
-+
-+        partition@1000000 {
-+            compatible = "brcm,bcm4908-firmware";
-+            reg = <0x1000000 0xf00000>;
-+        };
-+
-+        partition@1f00000 {
-+            label = "calibration";
-+            reg = <0x1f00000 0x100000>;
-+        };
-+    };
diff --git a/target/linux/bcm4908/patches-5.4/140-0003-mtd-parsers-ofpart-support-BCM4908-fixed-partitions.patch b/target/linux/bcm4908/patches-5.4/140-0003-mtd-parsers-ofpart-support-BCM4908-fixed-partitions.patch
deleted file mode 100644
index 689807d48e..0000000000
--- a/target/linux/bcm4908/patches-5.4/140-0003-mtd-parsers-ofpart-support-BCM4908-fixed-partitions.patch
+++ /dev/null
@@ -1,191 +0,0 @@
-From db18357719613cc40234300b10e28e4dfa075375 Mon Sep 17 00:00:00 2001
-From: =?UTF-8?q?Rafa=C5=82=20Mi=C5=82ecki?= <rafal@milecki.pl>
-Date: Fri, 15 Jan 2021 16:23:01 +0100
-Subject: [PATCH 3/3] mtd: parsers: ofpart: support BCM4908 fixed partitions
-MIME-Version: 1.0
-Content-Type: text/plain; charset=UTF-8
-Content-Transfer-Encoding: 8bit
-
-BCM4908 partitioning is based on fixed layout but allows specifying
-multiple firmware partitions. It requires detecting which firmware
-partition was used for booting current kernel.
-
-To support such cases without duplicating a lot of code (without copying
-most of the ofpart.c code) support for post-parsing callback was added.
-
-BCM4908 callback simply reads offset of currently used firmware
-partition from the DT. Bootloader specifies it using the "brcm_blparms"
-property.
-
-Signed-off-by: Rafał Miłecki <rafal@milecki.pl>
----
- drivers/mtd/parsers/Makefile             |  1 +
- drivers/mtd/parsers/bcm4908-partitions.c | 62 ++++++++++++++++++++++++
- drivers/mtd/parsers/bcm4908-partitions.h |  7 +++
- drivers/mtd/parsers/ofpart.c             | 28 ++++++++++-
- 4 files changed, 96 insertions(+), 2 deletions(-)
- create mode 100644 drivers/mtd/parsers/bcm4908-partitions.c
- create mode 100644 drivers/mtd/parsers/bcm4908-partitions.h
-
---- a/drivers/mtd/parsers/Makefile
-+++ b/drivers/mtd/parsers/Makefile
-@@ -5,6 +5,7 @@ obj-$(CONFIG_MTD_BCM63XX_PARTS)		+= bcm6
- obj-$(CONFIG_MTD_CMDLINE_PARTS)		+= cmdlinepart.o
- obj-$(CONFIG_MTD_MYLOADER_PARTS)		+= myloader.o
- obj-$(CONFIG_MTD_OF_PARTS)		+= ofpart.o
-+obj-$(CONFIG_MTD_OF_PARTS)		+= bcm4908-partitions.o
- obj-$(CONFIG_MTD_PARSER_IMAGETAG)	+= parser_imagetag.o
- obj-$(CONFIG_MTD_AFS_PARTS)		+= afs.o
- obj-$(CONFIG_MTD_PARSER_TRX)		+= parser_trx.o
---- /dev/null
-+++ b/drivers/mtd/parsers/bcm4908-partitions.c
-@@ -0,0 +1,62 @@
-+// SPDX-License-Identifier: GPL-2.0
-+/*
-+ * Copyright (C) 2021 Rafał Miłecki <rafal@milecki.pl>
-+ */
-+
-+#include <linux/module.h>
-+#include <linux/init.h>
-+#include <linux/of.h>
-+#include <linux/mtd/mtd.h>
-+#include <linux/slab.h>
-+#include <linux/mtd/partitions.h>
-+
-+#define BLPARAMS_FW_OFFSET		"NAND_RFS_OFS"
-+
-+static long long bcm4908_partitions_fw_offset(void)
-+{
-+	struct device_node *root;
-+	struct property *prop;
-+	const char *s;
-+
-+	root = of_find_node_by_path("/");
-+	if (!root)
-+		return -ENOENT;
-+
-+	of_property_for_each_string(root, "brcm_blparms", prop, s) {
-+		size_t len = strlen(BLPARAMS_FW_OFFSET);
-+		unsigned long offset;
-+		int err;
-+
-+		if (strncmp(s, BLPARAMS_FW_OFFSET, len) || s[len] != '=')
-+			continue;
-+
-+		err = kstrtoul(s + len + 1, 0, &offset);
-+		if (err) {
-+			pr_err("failed to parse %s\n", s + len + 1);
-+			return err;
-+		}
-+
-+		return offset << 10;
-+	}
-+
-+	return -ENOENT;
-+}
-+
-+int bcm4908_partitions_post_parse(struct mtd_info *mtd, struct mtd_partition *parts, int nr_parts)
-+{
-+	long long fw_offset;
-+	int i;
-+
-+	fw_offset = bcm4908_partitions_fw_offset();
-+
-+	for (i = 0; i < nr_parts; i++) {
-+		if (of_device_is_compatible(parts[i].of_node, "brcm,bcm4908-firmware")) {
-+			if (fw_offset < 0 || parts[i].offset == fw_offset)
-+				parts[i].name = "firmware";
-+			else
-+				parts[i].name = "backup";
-+		}
-+	}
-+
-+	return 0;
-+}
---- /dev/null
-+++ b/drivers/mtd/parsers/bcm4908-partitions.h
-@@ -0,0 +1,7 @@
-+/* SPDX-License-Identifier: GPL-2.0 */
-+#ifndef __BCM4908_PARTITIONS_H
-+#define __BCM4908_PARTITIONS_H
-+
-+int bcm4908_partitions_post_parse(struct mtd_info *mtd, struct mtd_partition *parts, int nr_parts);
-+
-+#endif
---- a/drivers/mtd/parsers/ofpart.c
-+++ b/drivers/mtd/parsers/ofpart.c
-@@ -16,6 +16,18 @@
- #include <linux/slab.h>
- #include <linux/mtd/partitions.h>
- 
-+#include "bcm4908-partitions.h"
-+
-+struct fixed_partitions_quirks {
-+	int (*post_parse)(struct mtd_info *mtd, struct mtd_partition *parts, int nr_parts);
-+};
-+
-+struct fixed_partitions_quirks bcm4908_partitions_quirks = {
-+	.post_parse = bcm4908_partitions_post_parse,
-+};
-+
-+static const struct of_device_id parse_ofpart_match_table[];
-+
- static bool node_has_compatible(struct device_node *pp)
- {
- 	return of_get_property(pp, "compatible", NULL);
-@@ -25,6 +37,8 @@ static int parse_fixed_partitions(struct
- 				  const struct mtd_partition **pparts,
- 				  struct mtd_part_parser_data *data)
- {
-+	const struct fixed_partitions_quirks *quirks;
-+	const struct of_device_id *of_id;
- 	struct mtd_partition *parts;
- 	struct device_node *mtd_node;
- 	struct device_node *ofpart_node;
-@@ -33,7 +47,6 @@ static int parse_fixed_partitions(struct
- 	int nr_parts, i, ret = 0;
- 	bool dedicated = true;
- 
--
- 	/* Pull of_node from the master device node */
- 	mtd_node = mtd_get_of_node(master);
- 	if (!mtd_node)
-@@ -50,11 +63,16 @@ static int parse_fixed_partitions(struct
- 			 master->name, mtd_node);
- 		ofpart_node = mtd_node;
- 		dedicated = false;
--	} else if (!of_device_is_compatible(ofpart_node, "fixed-partitions")) {
-+	}
-+
-+	of_id = of_match_node(parse_ofpart_match_table, ofpart_node);
-+	if (dedicated && !of_id) {
- 		/* The 'partitions' subnode might be used by another parser */
- 		return 0;
- 	}
- 
-+	quirks = of_id ? of_id->data : NULL;
-+
- 	/* First count the subnodes */
- 	nr_parts = 0;
- 	for_each_child_of_node(ofpart_node,  pp) {
-@@ -123,6 +141,9 @@ static int parse_fixed_partitions(struct
- 	if (!nr_parts)
- 		goto ofpart_none;
- 
-+	if (quirks && quirks->post_parse)
-+		quirks->post_parse(master, parts, nr_parts);
-+
- 	*pparts = parts;
- 	return nr_parts;
- 
-@@ -137,7 +158,10 @@ ofpart_none:
- }
- 
- static const struct of_device_id parse_ofpart_match_table[] = {
-+	/* Generic */
- 	{ .compatible = "fixed-partitions" },
-+	/* Customized */
-+	{ .compatible = "brcm,bcm4908-partitions", .data = &bcm4908_partitions_quirks, },
- 	{},
- };
- MODULE_DEVICE_TABLE(of, parse_ofpart_match_table);