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mtd: core: add OTP nvmem provider support

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Flash OTP regions can already be read via user space. Some boards have
their serial number or MAC addresses stored in the OTP regions. Add
support for them being a (read-only) nvmem provider.

The API to read the OTP data is already in place. It distinguishes
between factory and user OTP, thus there are up to two different
providers.

Signed-off-by: Michael Walle <michael@walle.cc>
Signed-off-by: Miquel Raynal <miquel.raynal@bootlin.com>
Link: https://lore.kernel.org/linux-mtd/20210424110608.15748-6-michael@walle.cc
This commit is contained in:
Michael Walle
2021-04-24 13:06:08 +02:00
committed by Miquel Raynal
parent 96d3af22f8
commit 4b361cfa86
2 changed files with 150 additions and 0 deletions
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2
include/linux/mtd/mtd.h
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@@ -380,6 +380,8 @@ struct mtd_info {
int usecount;
struct mtd_debug_info dbg;
struct nvmem_device *nvmem;
struct nvmem_device *otp_user_nvmem;
struct nvmem_device *otp_factory_nvmem;
/*
* Parent device from the MTD partition point of view.