mtd: gpmi: add a new field for HW_GPMI_CTRL1

add the WRN_DLY_SEL field for HW_GPMI_CTRL1.
This field is used as delay for gpmi write strobe.

Signed-off-by: Huang Shijie <b32955@freescale.com>
Signed-off-by: Artem Bityutskiy <artem.bityutskiy@linux.intel.com>
Signed-off-by: David Woodhouse <David.Woodhouse@intel.com>
diff --git a/drivers/mtd/nand/gpmi-nand/gpmi-nand.h b/drivers/mtd/nand/gpmi-nand/gpmi-nand.h
index c814bdd..5c11e76 100644
--- a/drivers/mtd/nand/gpmi-nand/gpmi-nand.h
+++ b/drivers/mtd/nand/gpmi-nand/gpmi-nand.h
@@ -195,6 +195,7 @@
  * @use_half_periods:          Indicates the clock is running slowly, so the
  *                             NFC DLL should use half-periods.
  * @sample_delay_factor:       The sample delay factor.
+ * @wrn_dly_sel:               The delay on the GPMI write strobe.
  */
 struct gpmi_nfc_hardware_timing {
 	/* for HW_GPMI_TIMING0 */
@@ -209,6 +210,7 @@
 	/* for HW_GPMI_CTRL1 */
 	bool     use_half_periods;
 	uint8_t  sample_delay_factor;
+	uint8_t  wrn_dly_sel;
 };
 
 /**