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Message-Id: <20251105-winbond-v6-18-rc1-spi-nor-v1-6-42cc9fb46e1b@bootlin.com>
Date: Wed, 05 Nov 2025 18:27:05 +0100
From: Miquel Raynal <miquel.raynal@...tlin.com>
To: Tudor Ambarus <tudor.ambarus@...aro.org>,
Pratyush Yadav <pratyush@...nel.org>, Michael Walle <mwalle@...nel.org>,
Miquel Raynal <miquel.raynal@...tlin.com>,
Richard Weinberger <richard@....at>, Vignesh Raghavendra <vigneshr@...com>
Cc: Thomas Petazzoni <thomas.petazzoni@...tlin.com>,
Steam Lin <STLin2@...bond.com>, linux-mtd@...ts.infradead.org,
linux-kernel@...r.kernel.org, stable@...r.kernel.org
Subject: [PATCH 6/6] mtd: spi-nor: winbond: Add support for W25H02NWxxAM
chips
These chips must be described as none of the block protection
information are discoverable. This chip supports 4 bits plus the
top/bottom addressing capability to identify the protected blocks.
Cc: stable@...r.kernel.org
Signed-off-by: Miquel Raynal <miquel.raynal@...tlin.com>
---
$ cat /sys/bus/spi/devices/spi0.0/spi-nor/partname
cat: can't open '/sys/bus/spi/devices/spi0.0/spi-nor/partname': No such file or directory
$ cat /sys/bus/spi/devices/spi0.0/spi-nor/jedec_id
efa022
$ cat /sys/bus/spi/devices/spi0.0/spi-nor/manufacturer
winbond
$ xxd -p /sys/bus/spi/devices/spi0.0/spi-nor/sfdp
53464450060101ff00060110800000ff84000102d00000ff03000102f000
00ffffffffffffffffffffffffffffffffffffffffffffffffffffffffff
ffffffffffffffffffffffffffffffffffffffffffffffffffffffffffff
ffffffffffffffffffffffffffffffffffffffffffffffffffffffffffff
ffffffffffffffffe520fbffffffff7f44eb086b083b42bbfeffffffffff
0000ffff40eb0c200f5210d800003652b50082ea14e2e96376337a757a75
f7a2d55c199148ffe970f8a1ffffffffffffffffffffffffffffffffff0a
f0ff21ffdcff
$ sha256sum /sys/bus/spi/devices/spi0.0/spi-nor/sfdp
679145368f2188ac975ec3f4c9b691e7e250147c13b6f18a28a9192700925d95 /sys/bus/spi/devices/spi0.0/spi-nor/sfdp
$ cat /sys/kernel/debug/spi-nor/spi0.0/params
name (null)
id ef a0 22 00 00 00
size 256 MiB
write size 1
page size 256
address nbytes 4
flags HAS_SR_TB | 4B_OPCODES | HAS_4BAIT | HAS_LOCK | HAS_16BIT_SR | NO_READ_CR | HAS_SR_TB_BIT6 | HAS_4BIT_BP | SOFT_RESET | NO_WP
opcodes
read 0xec
dummy cycles 6
erase 0xdc
program 0x34
8D extension none
protocols
read 1S-4S-4S
write 1S-1S-4S
register 1S-1S-1S
erase commands
21 (4.00 KiB) [1]
dc (64.0 KiB) [3]
c7 (256 MiB)
sector map
region (in hex) | erase mask | overlaid
------------------+------------+---------
00000000-0fffffff | [ 3] | no
$ cat /sys/kernel/debug/spi-nor/spi0.0/capabilities
Supported read modes by the flash
1S-1S-1S
opcode 0x13
mode cycles 0
dummy cycles 0
1S-1S-2S
opcode 0x3c
mode cycles 0
dummy cycles 8
1S-2S-2S
opcode 0xbc
mode cycles 2
dummy cycles 2
1S-1S-4S
opcode 0x6c
mode cycles 0
dummy cycles 8
1S-4S-4S
opcode 0xec
mode cycles 2
dummy cycles 4
4S-4S-4S
opcode 0xec
mode cycles 2
dummy cycles 0
Supported page program modes by the flash
1S-1S-1S
opcode 0x12
1S-1S-4S
opcode 0x34
$ dd if=/dev/urandom of=./spi_test bs=1M count=2
2+0 records in
2+0 records out
$ mtd_debug erase /dev/mtd0 0 2097152
Erased 2097152 bytes from address 0x00000000 in flash
$ mtd_debug read /dev/mtd0 0 2097152 spi_read
Copied 2097152 bytes from address 0x00000000 in flash to spi_read
$ hexdump spi_read
0000000 ffff ffff ffff ffff ffff ffff ffff ffff
*
0200000
$ sha256sum spi_read
4bda3a28f4ffe603c0ec1258c0034d65a1a0d35ab7bd523a834608adabf03cc5 spi_read
$ mtd_debug write /dev/mtd0 0 2097152 spi_test
Copied 2097152 bytes from spi_test to address 0x00000000 in flash
$ mtd_debug read /dev/mtd0 0 2097152 spi_read
Copied 2097152 bytes from address 0x00000000 in flash to spi_read
$ sha256sum spi*
0f59f02ed36e0c9a0c075787e27175d3428ac008be71c2322dcaf9000ef1e324 spi_read
0f59f02ed36e0c9a0c075787e27175d3428ac008be71c2322dcaf9000ef1e324 spi_test
$ mtd_debug erase /dev/mtd0 0 2097152
mtd_debug read /dev/mtd0 0 2097152 spi_read
Erased 2097152 bytes from address 0x00000000 in flash
$ mtd_debug read /dev/mtd0 0 2097152 spi_read
sha256sum spi*
Copied 2097152 bytes from address 0x00000000 in flash to spi_read
$ sha256sum spi*
4bda3a28f4ffe603c0ec1258c0034d65a1a0d35ab7bd523a834608adabf03cc5 spi_read
0f59f02ed36e0c9a0c075787e27175d3428ac008be71c2322dcaf9000ef1e324 spi_test
$ mtd_debug info /dev/mtd0
mtd.type = MTD_NORFLASH
mtd.flags = MTD_CAP_NORFLASH
mtd.size = 268435456 (256M)
mtd.erasesize = 65536 (64K)
mtd.writesize = 1
mtd.oobsize = 0
regions = 0
---
drivers/mtd/spi-nor/winbond.c | 4 ++++
1 file changed, 4 insertions(+)
diff --git a/drivers/mtd/spi-nor/winbond.c b/drivers/mtd/spi-nor/winbond.c
index 338e44db506a819b15e21f312c06ec13e6d37d28..fb855fe44733db5664c200520d19a6be33edc323 100644
--- a/drivers/mtd/spi-nor/winbond.c
+++ b/drivers/mtd/spi-nor/winbond.c
@@ -363,6 +363,10 @@ static const struct flash_info winbond_nor_parts[] = {
/* W25H01NWxxAM */
.id = SNOR_ID(0xef, 0xa0, 0x21),
.flags = SPI_NOR_HAS_LOCK | SPI_NOR_HAS_TB | SPI_NOR_TB_SR_BIT6 | SPI_NOR_4BIT_BP,
+ }, {
+ /* W25H02NWxxAM */
+ .id = SNOR_ID(0xef, 0xa0, 0x22),
+ .flags = SPI_NOR_HAS_LOCK | SPI_NOR_HAS_TB | SPI_NOR_TB_SR_BIT6 | SPI_NOR_4BIT_BP,
},
};
--
2.51.0
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