[PATCH] RFC: mtd/spi-nor: add checking for the spi_nor_read

[Bean Huo 霍斌斌 (beanhuo)]

Hi,
Is it convenient to tell me that which vendor's spi nor?
For current spi nor structure, write operation has been already split transaction length
By page size(256 Bytes). But seems "retlen" not reasonable.

Spi nor read operation indeed does not take spi controller's transaction ability into
Account.but for spi nor, one-time read length is non-restrictive.

--Beanhuo