+#define GIGADEVICE_GD25VQ21B 0x4212 +#define GIGADEVICE_GD25VQ41B 0x4213 /* Same as GD25VQ40C, can be distinguished by SFDP */
This comment should go in the .c file, above the model_id for the GD25VQ40C and GD25VQ41B.
Aside from that, this patch looks good to me. I tested read/write/erase on a GD25VQ41B.