Merge tag 'mtd/for-7.1' of git://git.kernel.org/pub/scm/linux/kernel/git/mtd/linuxHEADmaster

Pull MTD updates from Miquel Raynal:
 "MTD changes:

   - mtdconcat finally makes it in, after several years of being merged
     and reverted

   - Baikal SoC support is being removed, so MTD bits are being removed
     as well

   - misc cleanups

  NAND changes:

   - SunXi driver support for new versions of the Allwinner NAND
     controller.

   - DT-binding improvements and cleanups.

   - A few fixes (Realtek ECC and Winbond SPI NAND), aside with the
     usual load of misc changes.

  SPI NOR fixes:

   - Enable die erase on MT35XU02GCBA. We knew this flash needed this
     fixup since 7f77c561e227 ("mtd: spi-nor: micron-st: add TODO for
     fixing mt35xu02gcba") but did not add it due to lack of hardware to
     test on.

   - Fix locking on some Winbond w25q series flashes.

   - Fix Auto Address Increment (AAI) writes on SST that flashes that
     start on odd address. The write enable latch needs to be set again
     after the single byte program"

* tag 'mtd/for-7.1' of git://git.kernel.org/pub/scm/linux/kernel/git/mtd/linux: (44 commits)
  mtd: spinand: winbond: Declare the QE bit on W25NxxJW
  mtd: spi-nor: micron-st: Enable die erase support for MT35XU02GCBA
  mtd: spi-nor: winbond: Fix locking support for w25q256jw
  mtd: spi-nor: sst: Fix write enable before AAI sequence
  mtd: spi-nor: winbond: Fix locking support for w25q64jvm
  mtd: spi-nor: winbond: Fix locking support for w25q256jwm
  dt-bindings: mtd: mxc-nand: add missing compatible string and ref to nand-controller-legacy.yaml
  dt-bindings: mtd: gpmi-nand: ref to nand-controller-legacy.yaml
  dt-bindings: mtd: refactor NAND bindings and add nand-controller-legacy.yaml
  mtd: spinand: winbond: Clarify when to enable the HS bit
  mtd: rawnand: sunxi: introduce maximize variable user data length
  mtd: rawnand: sunxi: fix typos in comments
  mtd: rawnand: sunxi: change error prone variable name
  mtd: rawnand: sunxi: remove dead code
  mtd: rawnand: sunxi: make the code more self-explanatory
  mtd: rawnand: sunxi: replace hard coded value by a define - take2
  mtd: rawnand: sunxi: do not count BBM bytes twice
  mtd: rawnand: sunxi: fix sunxi_nfc_hw_ecc_read_extra_oob
  mtd: rawnand: sunxi: sunxi_nand_ooblayout_free code clarification
  mtd: cmdlinepart: use a flexible array member
  ...

1 files changed, 62 insertions, 1 deletions

diff --git a/include/linux/mtd/concat.h b/include/linux/mtd/concat.h
index d6f653e07426..f8d4d6ac1fc1 100644
--- a/include/linux/mtd/concat.h
+++ b/include/linux/mtd/concat.h
@@ -9,6 +9,18 @@
 #define MTD_CONCAT_H
 
 
+/*
+ * Our storage structure:
+ * Subdev points to an array of pointers to struct mtd_info objects
+ * which is allocated along with this structure
+ *
+ */
+struct mtd_concat {
+	struct mtd_info mtd;
+	int num_subdev;
+	struct mtd_info *subdev[];
+};
+
 struct mtd_info *mtd_concat_create(
     struct mtd_info *subdev[],  /* subdevices to concatenate */
     int num_devs,               /* number of subdevices      */
@@ -16,5 +28,54 @@ struct mtd_info *mtd_concat_create(
 
 void mtd_concat_destroy(struct mtd_info *mtd);
 
-#endif
+/**
+ * mtd_virt_concat_node_create - Create a component for concatenation
+ *
+ * Returns a positive number representing the no. of devices found for
+ * concatenation, or a negative error code.
+ *
+ * List all the devices for concatenations found in DT and create a
+ * component for concatenation.
+ */
+int mtd_virt_concat_node_create(void);
+
+/**
+ * mtd_virt_concat_add - add mtd_info object to the list of subdevices for concatenation
+ * @mtd: pointer to new MTD device info structure
+ *
+ * Returns true if the mtd_info object is added successfully else returns false.
+ *
+ * The mtd_info object is added to the list of subdevices for concatenation.
+ * It returns true if a match is found, and false if all subdevices have
+ * already been added or if the mtd_info object does not match any of the
+ * intended MTD devices.
+ */
+bool mtd_virt_concat_add(struct mtd_info *mtd);
 
+/**
+ * mtd_virt_concat_create_join - Create and register the concatenated MTD device
+ *
+ * Returns 0 on succes, or a negative error code.
+ *
+ * Creates and registers the concatenated MTD device
+ */
+int mtd_virt_concat_create_join(void);
+
+/**
+ * mtd_virt_concat_destroy - Remove the concat that includes a specific mtd device
+ *                           as one of its components.
+ * @mtd: pointer to MTD device info structure.
+ *
+ * Returns 0 on succes, or a negative error code.
+ *
+ * If the mtd_info object is part of a concatenated device, all other MTD devices
+ * within that concat are registered individually. The concatenated device is then
+ * removed, along with its concatenation component.
+ *
+ */
+int mtd_virt_concat_destroy(struct mtd_info *mtd);
+
+void mtd_virt_concat_destroy_joins(void);
+void mtd_virt_concat_destroy_items(void);
+
+#endif