Adesto AT25SF041(formerly atmel) with chip erase

I'm adding support for AT25SF041 which is an Adesto product. Formerly Atmel. We you prefer this under the AT25 heading since it's not officially Atmel? Or create a new class for Adesto? I'm also working with Winbond W25X4 and both chips support chip_erase, but I"m not immediately seeing a clean way to implement this with the existing structure. It's a different command w/ different parameters and operating requirements. I have added a separate 'erase_chip' method as a POC, but if you have any ideas on how to integrate this into the existing erase() methods, I'm all ears.