Add support for Sercomm partitions

This patch add support for Sercomm mtd partition table parser. It's used in some Beeline, Netgear and Sercomm routers. The Sercomm partition map table contains real partition offsets, which may differ from device to device depending on the number and location of bad blocks on NAND. All necessary dt bindings has already been added previously.

Changes since:
v5:
- Fix undefined "__udivdi3" on 32-bit platforms (Reported-by: kernel test robot <[email protected]>): limit patch scope to RALINK platform only
- Sort variables

v4:
- Add Acked-by to the first patch

v3:
- Fix commit message of the first patch
- Add Reviewed-by to the second patch

v2:
- Fix mistakes in dt-binding
- Add patch for new vendor prefix
- Add vendor prefix to scpart-id property

v1:
- Add dt-binding in a separate patch
- Remove redundant braces and logical NOT operator
- Define pr_fmt
- Replace kcalloc by kzalloc
- Use of_get_child_count() and alloc big enough array before the for_each_child_of_node()

Mikhail Zhilkin (1):
mtd: parsers: add support for Sercomm partitions

 drivers/mtd/parsers/Kconfig  |   9 ++
 drivers/mtd/parsers/Makefile |   1 +
 drivers/mtd/parsers/scpart.c | 248 +++++++++++++++++++++++++++++++++++
 3 files changed, 258 insertions(+)
 create mode 100644 drivers/mtd/parsers/scpart.c

2.25.1

This adds an MTD partition parser for the Sercomm partition table that is used in some Beeline, Netgear and Sercomm routers.

The Sercomm partition map table contains real partition offsets, which may differ from device to device depending on the number and location of bad blocks on NAND.

Original patch (proposed by NOGUCHI Hiroshi):

---
 drivers/mtd/parsers/Kconfig  |   9 ++
 drivers/mtd/parsers/Makefile |   1 +
 drivers/mtd/parsers/scpart.c | 248 +++++++++++++++++++++++++++++++++++
 3 files changed, 258 insertions(+)
 create mode 100644 drivers/mtd/parsers/scpart.c

index 23763d16e4f9..b43df73927a0 100644
@@ -186,3 +186,12 @@ config MTD_QCOMSMEM_PARTS
 	help
 	  This provides support for parsing partitions from Shared Memory (SMEM)
 	  for NAND and SPI flash on Qualcomm platforms.
+
+config MTD_SERCOMM_PARTS
+	tristate "Sercomm partition table parser"
+	depends on MTD && RALINK
+	help
+	  This provides partitions table parser for devices with Sercomm
+	  partition map. This partition table contains real partition
+	  offsets, which may differ from device to device depending on the
+	  number and location of bad blocks on NAND.

index 2e98aa048278..2fcf0ab9e7da 100644
@@ -10,6 +10,7 @@ ofpart-$(CONFIG_MTD_OF_PARTS_LINKSYS_NS)+= ofpart_linksys_ns.o
 obj-$(CONFIG_MTD_PARSER_IMAGETAG)	+= parser_imagetag.o
 obj-$(CONFIG_MTD_AFS_PARTS)		+= afs.o
 obj-$(CONFIG_MTD_PARSER_TRX)		+= parser_trx.o
+obj-$(CONFIG_MTD_SERCOMM_PARTS)		+= scpart.o
 obj-$(CONFIG_MTD_SHARPSL_PARTS)		+= sharpslpart.o
 obj-$(CONFIG_MTD_REDBOOT_PARTS)		+= redboot.o
 obj-$(CONFIG_MTD_QCOMSMEM_PARTS)	+= qcomsmempart.o

2.25.1

Applied to https://git.kernel.org/pub/scm/linux/kernel/git/mtd/linux.git mtd/next, thanks.

Miquel