[PATCH V8] mtd: spi-nor: winbond: add support for W25Q512NW-IM

[Sajida Bhanu (Temp)]

Hi,

Thanks for the review.

Please find the inline comments.

Thanks,
Sajida

On 4/19/2022 1:02 PM, Tudor.Ambarus at microchip.com wrote:

> On 4/19/22 07:27, Pratyush Yadav wrote:
>> EXTERNAL EMAIL: Do not click links or open attachments unless you know the content is safe
>>
>> On 25/03/22 12:36PM, Shaik Sajida Bhanu wrote:
>>> Add support for winbond W25Q512NW-IM chip.
>>>
>>> Below are the tests done:
>>>
>>> 1. Verified flashing binary image on spi card using flashrom tool.
>>> 2. Verified OTP support, below are the test results:
>>>
>>>   localhost / # cat
>>>   /sys/bus/platform/devices/soc\@0/88dc000.spi/spi_master/spi16/
>>>   spi16.0/spi-nor/jedec_id
>>>   ef8020
>>>
>>>   localhost / # cat
>>>   /sys/bus/platform/devices/soc\@0/88dc000.spi/spi_master/spi16/
>>>   spi16.0/spi-nor/manufacturer
>>>   winbond
>>>
>>>   localhost / # cat
>>>   /sys/bus/platform/devices/soc\@0/88dc000.spi/spi_master/spi16/
>>>   spi16.0/spi-nor/partname
>>>   w25q512nwm
>>>
>>>   localhost / # hexdump
>>>   /sys/bus/platform/devices/soc\@0/88dc000.spi/spi_master/sp
>>>   i16/spi16.0/spi-nor/sfdp
>>>   0000000 4653 5044 0106 ff01 0600 1001 0080 ff00
>>>   0000010 0084 0201 00d0 ff00 ffff ffff ffff ffff
>>>   0000020 6800 6c65 6f6c 7720 726f 646c ffff ffff
>>>   0000030 ffff ffff ffff ffff ffff ffff ffff ffff
>>>   *
>>>   0000080 20e5 fffb ffff 1fff eb44 6b08 3b08 bb42
>>>   0000090 fffe ffff ffff 0000 ffff eb40 200c 520f
>>>   00000a0 d810 0000 0233 00a6 e781 d914 63e9 3376
>>>   00000b0 757a 757a bdf7 5cd5 f719 ff5d 70e9 a5f9
>>>   00000c0 ffff ffff ffff ffff ffff ffff ffff ffff
>>>   00000d0 0aff fff0 ff21 ffdc
>>>   00000d8
>>>
>>>   localhost / # md5sum
>>>   /sys/bus/platform/devices/soc\@0/88dc000.spi/spi_master/spi
>>>   16/spi16.0/spi-nor/sfdp
>>>   106d89d6c049110bc94c01517cb4ce24
>>>   /sys/bus/platform/devices/soc at 0/88dc000.spi/
>>>   spi_master/spi16/spi16.0/spi-nor/sfdp
>>>
>>> 3. Tested flash lock, below are the test results (looks like the lock is
>>>   not working as expected, so when we do lock the whole card and tried to
>>>   write, write was successful without any errors.)
>> What should we do with this then? Drop the locking support? Or is there
>> something wrong/missing in SPI NOR core that needs to be fixed first so
>> locking for this flash works?
>>
> If the locking isn't working for this flash, please drop the locking flags
> until you identify the problem and fix it.
Okay for now dropping locking flag.
>>>   localhost ~ # flash_lock -i /dev/mtd0
>>>   Device: /dev/mtd0
>>>   Start: 0
>>>   Len: 0x4000000
>>>   Lock status: locked
>>>   Return code: 1
>>>   localhost ~ # mtd_debug erase /dev/mtd0 0x400000 4096
>>>   Erased 4096 bytes from address 0x00400000 in flash
>>>   localhost ~ # mtd_debug read /dev/mtd0 0x400000 4096
>>>   temp
>>>   Copied 4096 bytes from address 0x00400000 in flash
>>>   to temp
>>>   localhost ~ # mtd_debug write /dev/mtd0 0x400000
>>>   4096 temp
>>>   Copied 4096 bytes from temp to address 0x00400000
>>>   in flash
>>>   localhost ~ # flash_lock -u /dev/mtd0
>>>   localhost ~ # flash_lock -i /dev/mtd0
>>>   Device: /dev/mtd0
>>>   Start: 0
>>>   Len: 0x4000000
>>>   Lock status: unlocked
>>>   Return code: 0
>>>   localhost ~ # mtd_debug erase /dev/mtd0 0x400000 4096
>>>   Erased 4096 bytes from address 0x00400000 in flash
>>>   localhost ~ # mtd_debug read /dev/mtd0 0x400000
>>>   4096 tempCopied 4096 bytes from address 0x00400000 in
>>>   flash to temp
>>>   localhost ~ # mtd_debug write /dev/mtd0 0x400000 4096 temp
>>>   Copied 4096 bytes from temp to address 0x00400000 in flash
>>>   localhost ~ #
>>>
>>> Signed-off-by: Shaik Sajida Bhanu <quic_c_sbhanu at quicinc.com>
>>> Reviewed-by: Doug Anderson <dianders at chromium.org>
>>> Reviewed-by: Michael Walle <michael at walle.cc>
>> [...]
>>
>> --
>> Regards,
>> Pratyush Yadav
>> Texas Instruments Inc.