Re: [PATCH RFC v1 2/2] mtd: spi-nor: expose internal parameters via debugfs

[Michael Walle]

Am 2022-04-18 14:10, schrieb Michael Walle:
> There is no way to gather all information to verify support for a new
> flash chip. Also if you want to convert an existing flash chip to the
> new SFDP parsing, there is not enough information to determine if the
> flash will work like before. To ease this development, expose internal
> parameters via the debugfs.

Here's an example:
# cat params
name		w25q32dw
id		ef6016
size		4.00 MiB
write size	1
page size	256
address width	3
flags		HAS_SR_TB|HAS_LOCK|HAS_16BIT_SR|NO_READ_CR|SOFT_RESET

opcodes
 read		3b
  dummy cycles	8
 erase		20
 program	02
 8D extension	none

protocols
 read		1S-1S-2S
 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              | erase mask | flags
 --------------------+------------+----------
 00000000 - 003fffff |     [ 123] |

# cat capabilities
Supported read modes by the flash
1S-1S-1S
  opcode	03
  mode cycles	00
  dummy cycles	00
1S-1S-1S (fast read)
  opcode	0b
  mode cycles	00
  dummy cycles	08
1S-1S-2S
  opcode	3b
  mode cycles	00
  dummy cycles	08
1S-2S-2S
  opcode	bb
  mode cycles	02
  dummy cycles	02
1S-1S-4S
  opcode	6b
  mode cycles	00
  dummy cycles	08
1S-4S-4S
  opcode	eb
  mode cycles	02
  dummy cycles	04
4S-4S-4S
  opcode	eb
  mode cycles	02
  dummy cycles	00

Supported page program modes by the flash
1S-1S-1S
  opcode	02