[MTD] assume mtd->writesize is 1 for NOR flashes

Signed-off-by: Artem B. Bityitskiy
diff --git a/drivers/mtd/chips/amd_flash.c b/drivers/mtd/chips/amd_flash.c
index 9e46650..16eaca6 100644
--- a/drivers/mtd/chips/amd_flash.c
+++ b/drivers/mtd/chips/amd_flash.c
@@ -730,6 +730,7 @@
 		offset += dev_size;
 	}
 	mtd->type = MTD_NORFLASH;
+	mtd->writesize = 1;
 	mtd->flags = MTD_CAP_NORFLASH;
 	mtd->name = map->name;
 	mtd->erase = amd_flash_erase;
diff --git a/drivers/mtd/chips/cfi_cmdset_0002.c b/drivers/mtd/chips/cfi_cmdset_0002.c
index 3aeb0c7..1e01ad3 100644
--- a/drivers/mtd/chips/cfi_cmdset_0002.c
+++ b/drivers/mtd/chips/cfi_cmdset_0002.c
@@ -236,6 +236,7 @@
 	mtd->resume  = cfi_amdstd_resume;
 	mtd->flags   = MTD_CAP_NORFLASH;
 	mtd->name    = map->name;
+	mtd->writesize = 1;
 
 	if (cfi->cfi_mode==CFI_MODE_CFI){
 		unsigned char bootloc;
diff --git a/drivers/mtd/chips/sharp.c b/drivers/mtd/chips/sharp.c
index 3cc0b23..967abbe 100644
--- a/drivers/mtd/chips/sharp.c
+++ b/drivers/mtd/chips/sharp.c
@@ -140,6 +140,7 @@
 	mtd->suspend = sharp_suspend;
 	mtd->resume = sharp_resume;
 	mtd->flags = MTD_CAP_NORFLASH;
+	mtd->writesize = 1;
 	mtd->name = map->name;
 
 	memset(sharp, 0, sizeof(*sharp));