how to add spi flash driver?

[youyong]

the cpu is imx6dl,and we need add a driver of AT45DB021E spi flash.but it is not succeed.because it is also nor flash,so i add it like m25p80.c.but the result is as follows images.I can not see it in the "/dev".why?

[igorpadykov]

Hi youyong

please check struct spi_device_id spi_nor_ids in linux/drivers/mtd/devices/spi-nor/spi-nor.c

and add necessary model parameters. More details can be found in Chapter 31
SPI NOR Flash Memory Technology Device (MTD) Driver attached Linux Manual.

Best regards
igor
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[youyong]

How do I know if this drive is successful? For example, there are specific flags in the “/dev” directory.

[igorpadykov]

having sources, one can debug it using AN4553 Using Open Source Debugging

Tools for Linux on i.MX Processors
https://www.nxp.com/docs/en/application-note/AN4553.pdf

~igor