[PATCH v4 17/27] mtd: spi-nor: debugfs: Add locking support

[Pratyush Yadav]

On Mon, Apr 27 2026, Miquel Raynal wrote:

> Hello SPI NOR foks,
>
> On 10/04/2026 at 04:39:22 GMT, <Takahiro.Kuwano at infineon.com> wrote:
>
>>> The ioctl output may be counter intuitive in some cases. Asking for a
>>> "locked status" over a region that is only partially locked will return
>>> "unlocked" whereas in practice maybe the biggest part is actually
>>> locked.
>>> 
>>> Knowing what is the real software locking state through debugfs would be
>>> very convenient for development/debugging purposes, hence this proposal
>>> for adding an extra block at the end of the file: a "locked sectors"
>>> array which lists every section, if it is locked or not, showing both
>>> the address ranges and the sizes in numbers of blocks.
>>> 
>>> Here is an example of output, what is after the "sector map" is new.
>>> 
>>> $ cat /sys/kernel/debug/spi-nor/spi0.0/params
>>> name            (null)
>>> id              ef a0 20 00 00 00
>>> size            64.0 MiB
>>> write size      1
>>> page size       256
>>> address nbytes  4
>>> flags           HAS_SR_TB | 4B_OPCODES | HAS_4BAIT | HAS_LOCK | HAS_16BIT_SR | 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 (64.0 MiB)
>>> 
>>> sector map
>>>  region (in hex)   | erase mask | overlaid
>>>  ------------------+------------+---------
>>>  00000000-03ffffff |     [   3] | no
>>> 
>>> locked sectors
>>>  region (in hex)   | status   | #blocks
>>>  ------------------+----------+--------
>>>  00000000-03ffffff | unlocked | 1024
>>> 
>>> Signed-off-by: Miquel Raynal <miquel.raynal at bootlin.com>
>
> I don't want to be too pushy but this series has been pending for a
> while, there are real fixes inside, it (IMO) greatly improve the
> documentation, adds a testing procedure, gives a friendly interface to
> understand what is locked, etc. I am working on clarifying and improving
> the Winbond vendor driver even more now and I need these changes to get
> in for the cleanup to continue. Can someone bump spi-nor/next on top of
> v7.1-rc1 and apply this? Unless there are more changes, of course.

Yeah, my bad on this. I think a good part of this series should have
landed in the previous merge window. I was waiting to collect some
reviews on this before applying and didn't realize many patches already
had some.

Anyway, the series overall looks pretty good, although I didn't spend
time looking too closely. Will apply some time this week. Thanks for the
cleanup, it is much appreciated.

-- 
Regards,
Pratyush Yadav