NAND: DaVinci: allow forced disable of subpage writes

This patch introduces a configurable mechanism to disable
subpage writes in the DaVinci NAND driver.

Signed-off-by: Vitaly Andrianov <vitalya@ti.com>
Signed-off-by: Murali Karicheri <m-karicheri2@ti.com>
Acked-by: Tom Rini <trini@ti.com>
diff --git a/README b/README
index f39accf..c9990e6 100644
--- a/README
+++ b/README
@@ -4496,6 +4496,11 @@
 - CONFIG_SPL_AM33XX_ENABLE_RTC32K_OSC:
 		Enables the RTC32K OSC on AM33xx based plattforms
 
+- CONFIG_SYS_NAND_NO_SUBPAGE_WRITE
+		Option to disable subpage write in NAND driver
+		driver that uses this:
+		drivers/mtd/nand/davinci_nand.c
+
 Freescale QE/FMAN Firmware Support:
 -----------------------------------