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

[Miquel Raynal]

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.

Thanks a lot!
Miquèl