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

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Date:   Mon, 18 Apr 2022 14:13:28 +0200
From:   Michael Walle <michael@...le.cc>
To:     Tudor Ambarus <tudor.ambarus@...rochip.com>,
        Pratyush Yadav <p.yadav@...com>
Cc:     Miquel Raynal <miquel.raynal@...tlin.com>,
        Richard Weinberger <richard@....at>,
        Vignesh Raghavendra <vigneshr@...com>,
        linux-mtd@...ts.infradead.org, linux-kernel@...r.kernel.org
Subject: Re: [PATCH RFC v1 2/2] mtd: spi-nor: expose internal parameters via
 debugfs

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