The series is a follow-up and contains all patches of the previous series "mtd: ubi: behave like a good MTD citizen"[1] which was meant in preparation for implementing the NVMEM provider. The goal is to support embedded Linux devices which got NVMEM bits stored inside a UBI volume. Representing the UBI volume in the Device Tree, adding a phandle to be referenced by NVMEM consumers allows such devices to come up with their correct MAC addresses and device-specific Wi-Fi calibration data loaded. In order to be available for other drivers, attaching UBI devices has to be moved from late_initcall (which is too late for other drivers) to happen earlier. As an alternative to the existing kernel cmdline parameter the Device Tree property 'compatible = "linux,ubi";' inside an MTD partition can be used to have that MTD device attached as UBI device. MTD partitions which serve as UBI devices may have a "volumes" firmware subnode with volumes which may be compatible with "nvmem-cells". In this way, other drivers (think: Ethernet, Wi-Fi) can resolve and acquire NVMEM bits using the usual device tree phandle, just this time the NVMEM content is read from a UBI volume. [1]: https://patchwork.ozlabs.org/project/linux-mtd/list/?series=353177&state=%2A&archive=both Changes since v2: * include dt-bindings additions Changes since v1: * include patch to fix exiting Kconfig formatting issues * fix typo and indentation in Kconfig Daniel Golle (8): dt-bindings: mtd: add basic bindings for UBI dt-bindings: mtd: nvmem-cells: allow UBI volumes to provide NVMEM mtd: ubi: block: don't return on error when removing mtd: ubi: block: use notifier to create ubiblock from parameter mtd: ubi: attach MTD partition from device-tree mtd: ubi: introduce pre-removal notification for UBI volumes mtd: ubi: populate ubi volume fwnode mtd: ubi: provide NVMEM layer over UBI volumes .../bindings/mtd/partitions/linux,ubi.yaml | 66 ++++++ .../bindings/mtd/partitions/nvmem-cells.yaml | 5 +- .../bindings/mtd/partitions/ubi-volume.yaml | 35 ++++ drivers/mtd/ubi/Kconfig | 12 ++ drivers/mtd/ubi/Makefile | 1 + drivers/mtd/ubi/block.c | 186 ++++++++++------- drivers/mtd/ubi/build.c | 160 +++++++++++---- drivers/mtd/ubi/cdev.c | 4 +- drivers/mtd/ubi/nvmem.c | 189 ++++++++++++++++++ drivers/mtd/ubi/ubi.h | 6 +- drivers/mtd/ubi/vmt.c | 32 +++ include/linux/mtd/ubi.h | 2 + 12 files changed, 578 insertions(+), 120 deletions(-) create mode 100644 Documentation/devicetree/bindings/mtd/partitions/linux,ubi.yaml create mode 100644 Documentation/devicetree/bindings/mtd/partitions/ubi-volume.yaml create mode 100644 drivers/mtd/ubi/nvmem.c -- 2.41.0
