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Message-ID: <cover.1691717480.git.daniel@makrotopia.org>
Date: Fri, 11 Aug 2023 02:36:03 +0100
From: Daniel Golle <daniel@...rotopia.org>
To: Randy Dunlap <rdunlap@...radead.org>,
Miquel Raynal <miquel.raynal@...tlin.com>,
Richard Weinberger <richard@....at>,
Vignesh Raghavendra <vigneshr@...com>,
Rob Herring <robh+dt@...nel.org>,
Krzysztof Kozlowski <krzysztof.kozlowski+dt@...aro.org>,
Conor Dooley <conor+dt@...nel.org>,
Daniel Golle <daniel@...rotopia.org>,
linux-mtd@...ts.infradead.org, devicetree@...r.kernel.org,
linux-kernel@...r.kernel.org
Subject: [PATCH v4 0/8] mtd: ubi: allow UBI volumes to provide NVMEM
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 v3:
* dt-bindings fixes as requested
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: add support for UBI volumes
mtd: ubi: block: don't return on error when removing
mtd: ubi: block: use notifier to create ubiblock
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 | 36 ++++
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, 579 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
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