[PATCH v5 1/2] mtd: spi-nor: macronix: add support for Macronix octaflash

[Pratyush Yadav]

On 17/05/21 02:14PM, Zhengxun Li wrote:
> The octaflash is an xSPI compliant octal DTR flash. Add support
> for using it in octal DTR mode.
> 
> Try to verify the flash ID to check whether the flash memory in octal
> DTR mode and SPI mode are correct. When reading ID in OCTAL DTR mode,
> ID will appear in a repeated manner. ex: ID[0] = 0xc2, ID[1] = 0xc2,
> ID[2] = 0x94, ID[3] = 0x94... Rearrange the order so that the ID can pass.
> 
> The octaflash series can be divided into the following types:
> 
> MX25 series : Serial NOR Flash.
> MX66 series : Serial NOR Flash with stacked die.(Size larger than 1Gb)
> LM/UM series : Up to 250MHz clock frequency with both DTR/STR operation.
> LW/UW series : Support simultaneous Read-while-Write operation in multiple
> 	       bank architecture. Read-while-write feature which means read
> 	       data one bank while another bank is programing or erasing.
> 
> MX25LM : 3.0V Octal I/O
>  -https://www.mxic.com.tw/Lists/Datasheet/Attachments/7841/MX25LM51245G,%203V,%20512Mb,%20v1.1.pdf
> 
> MX25UM : 1.8V Octal I/O
>  -https://www.mxic.com.tw/Lists/Datasheet/Attachments/7525/MX25UM51245G%20Extreme%20Speed,%201.8V,%20512Mb,%20v1.0.pdf
> 
> MX66LM : 3.0V Octal I/O with stacked die
>  -https://www.mxic.com.tw/Lists/Datasheet/Attachments/7929/MX66LM1G45G,%203V,%201Gb,%20v1.1.pdf
> 
> MX66UM : 1.8V Octal I/O with stacked die
>  -https://www.mxic.com.tw/Lists/Datasheet/Attachments/7721/MX66UM1G45G,%201.8V,%201Gb,%20v1.1.pdf
> 
> MX25LW : 3.0V Octal I/O with Read-while-Write
> MX25UW : 1.8V Octal I/O with Read-while-Write
> MX66LW : 3.0V Octal I/O with Read-while-Write and stack die
> MX66UW : 1.8V Octal I/O with Read-while-Write and stack die
> 
> About LW/UW series, please contact us freely if you have any
> questions. For adding Octal NOR Flash IDs, we have validated
> each Flash on plateform zynq-picozed.
> 
> Signed-off-by: Zhengxun Li <zhengxunli at mxic.com.tw>

Reviewed-by: Pratyush Yadav <p.yadav at ti.com>

-- 
Regards,
Pratyush Yadav
Texas Instruments Inc.