linux-kernel - [PATCH 0/5] mtd: spi-nor: write protection at power-up

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Message-ID: <20190717084745.19322-1-tudor.ambarus@microchip.com>
Date:   Wed, 17 Jul 2019 08:47:56 +0000
From:   <Tudor.Ambarus@...rochip.com>
To:     <vigneshr@...com>, <marek.vasut@...il.com>
CC:     <dwmw2@...radead.org>, <computersforpeace@...il.com>,
        <miquel.raynal@...tlin.com>, <richard@....at>,
        <boris.brezillon@...labora.com>, <linux-mtd@...ts.infradead.org>,
        <linux-kernel@...r.kernel.org>, <Nicolas.Ferre@...rochip.com>,
        <Tudor.Ambarus@...rochip.com>
Subject: [PATCH 0/5] mtd: spi-nor: write protection at power-up

From: Tudor Ambarus <tudor.ambarus@...rochip.com>

There is no functional change intended for the first 2 patches.

Patch 3 adds support for the Global Block Unlock command: a single
command cycle that unlocks the entire memory array.

Patch 4 unlocks the global block protection on sst26vf064b. This is
identical with what other nor flashes are doing by clearing the
block protection bits from the status register: disable the write
protection after a power-on reset cycle.

Patch 5 adds a Kconfig option to disable the write protection at
power-up. This permits users to choose if they want the write
protection at power-up enabled or not. Backward compatibility imposes
to disable the write protection at power-up, so the Kconfig option is
selected by default.

Tudor Ambarus (5):
  mtd: spi-nor: fix description for int (*flash_is_locked)()
  mtd: spi-nor: group the code about the write protection at power-up
  mtd: spi-nor: add Global Block Unlock support
  mtd: spi-nor: unlock global block protection on sst26vf064b
  mtd: spi-nor: add Kconfig option to disable write protection at
    power-up

 drivers/mtd/spi-nor/Kconfig   |  8 ++++++
 drivers/mtd/spi-nor/spi-nor.c | 66 ++++++++++++++++++++++++++++++++-----------
 include/linux/mtd/spi-nor.h   |  9 +++---
 3 files changed, 62 insertions(+), 21 deletions(-)

-- 
2.9.5