On 25.08.2022 23:44, Michael Walle wrote:

Instead of hardcoding the underlying access method mtd_read() and
duplicating all the error handling, rewrite the driver as a nvmem
layout which just uses nvmem_device_read() and thus works with any
NVMEM device.

But because this is now not a device anymore, the compatible string
will have to be changed so the device will still be probed:
   compatible = "u-boot,env";
to
   compatible = "u-boot,env", "nvmem-cells";

"nvmem-cells" will tell the mtd layer to register a nvmem_device().
"u-boot,env" will tell the NVMEM that it should apply the u-boot
environment layout to the NVMEM device.

That's fishy but maybe we can ignore backward compatibility at
point.

Still you need to update DT binding.