Hi Heiko,

On Fri, May 28, 2021 at 4:26 AM Heiko Schocher [off-list ref] wrote:

The Microchip 48l640 is a 8KByte EERAM connected via SPI.

Signed-off-by: Heiko Schocher <redacted>
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I tried to use drivers/mtd/devices/mchp23k256.c but this
driver does not use any status register and there seems
slight differences in registers (no write enable register
for example), so I decided to make a new driver.

This driver sets the continuous mode bit in Status register,
which states you can write continuous ... but after writting
32 bytes the chip goes into an undefined state, so driver now
writes data in 32 byte chunks.

I also tried to use regmap, but it leads in a lot of more code,
and as this chip has only spi interface it makes no sense, or?

Tested  this driver on board imx8mp-phyboard-pollux-rdk
board, which is already in mainline.

Made some tbot tests, which write at random offset random
length bytes with dd and and random content. Reread the data
after a reboot and compare with the written data. Works fine.

Works for me too on an imx7d based board, thanks:

Tested-by: Fabio Estevam <redacted>