Hello, A year ago Bernhard Frauendienst started an effort to bring MTD devices concatenation generic [1]. Today I also need this concatenation to be possible in order to support configurations where two MTD devices are treated like one bigger in order to be able to define partitions across chip boundaries, hence reviving this patchset. After having talked with Mark Brown and Boris Brezillon this approach seems to be the cleanest and easiest one. If discussions need to happen, it is probably on the dt-bindings file where I tried to summarize the issue and the possible solutions in the commit log. I changed a bit the code logic and style but not so much, all the changes with the 2018 version are in [ ] in the commit logs. I would like to add another way to concatenate devices: with module parameters/arguments on the cmdline. I will extend this work once the bindings will have been discussed and accepted. Thanks, Miquèl [1] https://lwn.net/ml/linux-kernel/20180907173515.19990-1-kernel@xxxxxxxxxxxxxxxxx/ Bernhard Frauendienst (3): mtd: Add get_mtd_device_by_node() helper dt-bindings: mtd: Describe mtd-concat devices mtd: Add driver for concatenating devices Miquel Raynal (1): mtd: concat: Fix a comment referring to an unknown symbol .../devicetree/bindings/mtd/mtd-concat.yaml | 56 ++++++++ drivers/mtd/Kconfig | 8 ++ drivers/mtd/Makefile | 1 + drivers/mtd/mtd_virt_concat.c | 132 ++++++++++++++++++ drivers/mtd/mtdconcat.c | 5 +- drivers/mtd/mtdcore.c | 38 +++++ include/linux/mtd/mtd.h | 2 + 7 files changed, 238 insertions(+), 4 deletions(-) create mode 100644 Documentation/devicetree/bindings/mtd/mtd-concat.yaml create mode 100644 drivers/mtd/mtd_virt_concat.c -- 2.20.1
