linux-kernel - [PATCH v5 0/5] mtd: spi-nor: otp: 4 byte mode fix and erase support

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Message-Id: <20210604100252.9975-1-michael@walle.cc>
Date:   Fri,  4 Jun 2021 12:02:47 +0200
From:   Michael Walle <michael@...le.cc>
To:     linux-mtd@...ts.infradead.org, linux-kernel@...r.kernel.org
Cc:     Tudor Ambarus <tudor.ambarus@...rochip.com>,
        Michael Walle <michael@...le.cc>,
        Pratyush Yadav <p.yadav@...com>,
        Miquel Raynal <miquel.raynal@...tlin.com>,
        Richard Weinberger <richard@....at>,
        Vignesh Raghavendra <vigneshr@...com>
Subject: [PATCH v5 0/5] mtd: spi-nor: otp: 4 byte mode fix and erase support

This series is the follow up on the single patch
mtd: spi-nor: implement OTP erase for Winbond and similar flashes

Pratyush Yadav discovered a likely problem with bigger flashes, the address
to access the security registers is either 3 or 4 byte (at least for
winbond flashes).

Changes since v4:
 - add new patch to get rid taking the spi lock if length is zero. Please
   note, that I didn't squash this into the "Fixes:" patch because it is
   unrelated to the actual bug.
 - add comment which explains that we could also branch on an error in
   spi_nor_mtd_otp_range_is_locked()
 - check zero length in spi_nor_mtd_otp_erase() and return early before
   taking the lock

Changes since v3:
 - new patch to check for read-only OTP regions before writing
 - clarify term "security register"
 - don't combine lock and erase functions anymore. there are now
   more difference than similarities.

Changes since v2:
 - fix 3/4 byte mode access
 - use spi_nor_erase_sector() by swapping the nor->erase_opcode
 - use more consistent wording regarding the security registers

Changes since v1:
- fixed kernel doc


Michael Walle (5):
  mtd: spi-nor: otp: fix access to security registers in 4 byte mode
  mtd: spi-nor: otp: use more consistent wording
  mtd: spi-nor: otp: return -EROFS if region is read-only
  mtd: spi-nor: otp: simplify length check
  mtd: spi-nor: otp: implement erase for Winbond and similar flashes

 drivers/mtd/spi-nor/core.c    |   2 +-
 drivers/mtd/spi-nor/core.h    |   4 +
 drivers/mtd/spi-nor/otp.c     | 156 +++++++++++++++++++++++++++++++---
 drivers/mtd/spi-nor/winbond.c |   1 +
 4 files changed, 149 insertions(+), 14 deletions(-)

-- 
2.20.1