[PATCH v4] mtd: spi-nor: atmel: add at25sf321 entry

[Marcus Folkesson <marcus.folkesson@gmail.com>]

Add entry for the at25sf321 32Mbit SPI flash.

This flash is populated on a custom board and was tested at
10MHz frequency using the "ti,da830-spi" SPI controller.

Link: https://www.renesas.com/en/document/dst/at25sf321-datasheet?r=1608801
Reviewed-by: Michael Walle <mwalle@kernel.org>
Signed-off-by: Marcus Folkesson <marcus.folkesson@gmail.com>
---
root# cat /sys/class/spi_master/spi1/spi1.1/spi-nor/partname
at25sf321

root# cat /sys/class/spi_master/spi1/spi1.1/spi-nor/jedec_id
1f8701

root# cat /sys/class/spi_master/spi1/spi1.1/spi-nor/manufacturer
atmel

root# cat /sys/kernel/debug/spi-nor/spi1.1/capabilities
Supported read modes by the flash
 1S-1S-1S
  opcode        0x03
  mode cycles   0
  dummy cycles  0
 1S-1S-1S (fast read)
  opcode        0x0b
  mode cycles   0
  dummy cycles  8
 1S-1S-2S
  opcode        0x3b
  mode cycles   0
  dummy cycles  8
 1S-2S-2S
  opcode        0xbb
  mode cycles   4
  dummy cycles  0
 1S-1S-4S
  opcode        0x6b
  mode cycles   0
  dummy cycles  8
 1S-4S-4S
  opcode        0xeb
  mode cycles   2
  dummy cycles  4

Supported page program modes by the flash
 1S-1S-1S
  opcode        0x02

root# mtd_debug  info /dev/mtd6
mtd.type = MTD_NORFLASH
mtd.flags = MTD_BIT_WRITEABLE
mtd.size = 65536 (64K)
mtd.erasesize = 4096 (4K)
mtd.writesize = 1 
mtd.oobsize = 0 
regions = 0

SINGLE
======
spi-rx-bus-width = <1>;
spi-tx-bus-width = <1>;

root# cat /sys/kernel/debug/spi-nor/spi1.1/params
name            at25sf321
id              1f 87 01
size            4.00 MiB
write size      1
page size       256
address nbytes  3
flags           HAS_16BIT_SR

opcodes
 read           0x0b
  dummy cycles  8
 erase          0x20
 program        0x02
 8D extension   none

protocols
 read           1S-1S-1S
 write          1S-1S-1S
 register       1S-1S-1S

erase commands
 20 (4.00 KiB) [0]
 d8 (64.0 KiB) [1]
 c7 (4.00 MiB)

sector map
 region (in hex)   | erase mask | flags
 ------------------+------------+----------
 00000000-003fffff |     [01  ] |

DUAL
======
spi-rx-bus-width = <2>;
spi-tx-bus-width = <2>;

root# cat /sys/kernel/debug/spi-nor/spi1.1/params 
name            at25sf321
id              1f 87 01
size            4.00 MiB
write size      1
page size       256
address nbytes  3
flags           HAS_16BIT_SR | SOFT_RESET

opcodes
 read           0x0b
  dummy cycles  8
 erase          0x20
 program        0x02
 8D extension   repeat

protocols
 read           1S-1S-1S
 write          1S-1S-1S
 register       1S-1S-1S

erase commands
 20 (4.00 KiB) [1]
 52 (32.0 KiB) [2]
 d8 (64.0 KiB) [3]
 c7 (4.00 MiB)

sector map
 region (in hex)   | erase mask | flags
 ------------------+------------+----------
 00000000-003fffff |     [ 123] | 

QUAD
======
spi-rx-bus-width = <4>;
spi-tx-bus-width = <4>;

root# cat /sys/kernel/debug/spi-nor/spi1.1/params
name            at25sf321
id              1f 87 01
size            4.00 MiB
write size      1
page size       256
address nbytes  3
flags           HAS_16BIT_SR | SOFT_RESET

opcodes
 read           0x0b
  dummy cycles  8
 erase          0x20
 program        0x02
 8D extension   repeat

protocols
 read           1S-1S-1S
 write          1S-1S-1S
 register       1S-1S-1S

erase commands
 20 (4.00 KiB) [1]
 52 (32.0 KiB) [2]
 d8 (64.0 KiB) [3]
 c7 (4.00 MiB)

sector map
 region (in hex)   | erase mask | flags
 ------------------+------------+----------
 00000000-003fffff |     [ 123] |
---
Changes in v4:
- Join line for link in description
- Removed .name as the ID is reused by different chips
- Link to v3: https://lore.kernel.org/r/20241115-spi-nor-v3-1-93ec584177cb@gmail.com

Changes in v3:
- Add SPI_NOR_DUAL_READ and SPI_NOR_QUAD_READ flags
- Link to v2: https://lore.kernel.org/r/20241029-spi-nor-v2-1-e166c3900e19@gmail.com

Changes in v2:
- Change from at25sf321b to at25sf321
- Link to v1: https://lore.kernel.org/r/20241018-spi-nor-v1-1-d725bfb701ec@gmail.com
---
 drivers/mtd/spi-nor/atmel.c | 4 ++++
 1 file changed, 4 insertions(+)

diff --git a/drivers/mtd/spi-nor/atmel.c b/drivers/mtd/spi-nor/atmel.c
index 45d1153a04a07b7c61f46b117311b24ab695038f..82c592f0a1e156e6871785d58b670f76a0c03911 100644
--- a/drivers/mtd/spi-nor/atmel.c
+++ b/drivers/mtd/spi-nor/atmel.c
@@ -238,6 +238,10 @@ static const struct flash_info atmel_nor_parts[] = {
 		.flags = SPI_NOR_HAS_LOCK,
 		.no_sfdp_flags = SECT_4K,
 		.fixups = &at25fs_nor_fixups
+	}, {
+		.id = SNOR_ID(0x1f, 0x87, 0x01),
+		.size = SZ_4M,
+		.no_sfdp_flags = SECT_4K | SPI_NOR_DUAL_READ | SPI_NOR_QUAD_READ,
 	},
 };
 

---
base-commit: 200289db261f0c8131a5756133e9d30966289c3b
change-id: 20241018-spi-nor-dc29698dea0f

Best regards,
-- 
Marcus Folkesson <marcus.folkesson@gmail.com>