Messages in this thread | | | From | Michael Walle <> | Subject | [PATCH 0/2] mtd: spi-nor: support dumping sfdp tables | Date | Thu, 18 Mar 2021 10:24:04 +0100 |
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Add the possibility to dump the SFDP data of a flash device.
More and more flash devices share the same flash ID and we need per device fixups. Usually, these fixups differentiate flashes by looking at differences in the SFDP data. Determining the difference is only possible if we have the SFDP data for all the flashes which share a flash ID. This will lay the foundation to dump the whole SFDP data of a flash device.
This is even more important, because some datasheets doesn't even contain the SFDP data. Fixups for these kind of flashes are nearly impossible to do.
I envision having a database of all the SFDP data for the flashes we support and make it a requirement to submit it when a new flash is added. This might or might not have legal implications. Thus I'd start with having that database private to the SPI NOR maintainers.
Changes since RFC: - Don't read SFDP data after probe. The flash might already be switched to 8D-8D-8D mode. Instead, cache the SFDP data - add two sysfs files: jedec-id and name - change the file mode of the sfdp file from 0400 to 0444. There is no hardware access anymore.
Michael Walle (2): mtd: spi-nor: sfdp: save a copy of the SFDP data mtd: spi-nor: add initial sysfs support
drivers/mtd/spi-nor/Makefile | 2 +- drivers/mtd/spi-nor/core.c | 5 +++ drivers/mtd/spi-nor/core.h | 13 ++++++ drivers/mtd/spi-nor/sfdp.c | 49 ++++++++++++++++++++ drivers/mtd/spi-nor/sysfs.c | 86 ++++++++++++++++++++++++++++++++++++ include/linux/mtd/spi-nor.h | 3 ++ 6 files changed, 157 insertions(+), 1 deletion(-) create mode 100644 drivers/mtd/spi-nor/sysfs.c
-- 2.20.1
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