linux-kernel - [PATCH 2/2] mtd: spi-nor: unlock global block protection on sst26vf064b

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Message-ID: <20190823160452.14905-3-tudor.ambarus@microchip.com>
Date:   Fri, 23 Aug 2019 16:05:04 +0000
From:   <Tudor.Ambarus@...rochip.com>
To:     <marek.vasut@...il.com>, <vigneshr@...com>,
        <boris.brezillon@...labora.com>, <miquel.raynal@...tlin.com>,
        <richard@....at>, <linux-mtd@...ts.infradead.org>,
        <linux-kernel@...r.kernel.org>
CC:     <Tudor.Ambarus@...rochip.com>
Subject: [PATCH 2/2] mtd: spi-nor: unlock global block protection on
 sst26vf064b

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

To avoid inadvertent writes during power-up, sst26vf064b is
write-protected by default after a power-on reset cycle.
Unlock the serial flash memory by using the Global Block Protection
Unlock command - it offers a single command cycle that unlocks
the entire memory array.

Signed-off-by: Tudor Ambarus <tudor.ambarus@...rochip.com>
---
 drivers/mtd/spi-nor/spi-nor.c | 4 +++-
 1 file changed, 3 insertions(+), 1 deletion(-)

diff --git a/drivers/mtd/spi-nor/spi-nor.c b/drivers/mtd/spi-nor/spi-nor.c
index 08ae45fdc44a..5c18fd0c7fd2 100644
--- a/drivers/mtd/spi-nor/spi-nor.c
+++ b/drivers/mtd/spi-nor/spi-nor.c
@@ -2398,7 +2398,9 @@ static const struct flash_info spi_nor_ids[] = {
 	{ "sst25wf080",  INFO(0xbf2505, 0, 64 * 1024, 16, SECT_4K | SST_WRITE) },
 	{ "sst26wf016b", INFO(0xbf2651, 0, 64 * 1024, 32, SECT_4K |
 			      SPI_NOR_DUAL_READ | SPI_NOR_QUAD_READ) },
-	{ "sst26vf064b", INFO(0xbf2643, 0, 64 * 1024, 128, SECT_4K | SPI_NOR_DUAL_READ | SPI_NOR_QUAD_READ) },
+	{ "sst26vf064b", INFO(0xbf2643, 0, 64 * 1024, 128,
+			      SECT_4K | SPI_NOR_DUAL_READ | SPI_NOR_QUAD_READ |
+			      UNLOCK_GLOBAL_BLOCK) },
 
 	/* ST Microelectronics -- newer production may have feature updates */
 	{ "m25p05",  INFO(0x202010,  0,  32 * 1024,   2, 0) },
-- 
2.9.5