[MTD NAND] Allocate chip->buffers separately to allow it to be overridden

In particular, the board driver might need it to be DMAable.

Signed-off-by: David Woodhouse <dwmw2@infradead.org>

1 files changed, 4 insertions, 2 deletions

diff --git a/include/linux/mtd/nand.h b/include/linux/mtd/nand.h
index 88d690d79d77..cd4fe9ae8622 100644
--- a/include/linux/mtd/nand.h
+++ b/include/linux/mtd/nand.h
@@ -183,7 +183,9 @@ typedef enum {
 #define NAND_USE_FLASH_BBT      0x00010000
 /* This option skips the bbt scan during initialization. */
 #define NAND_SKIP_BBTSCAN       0x00020000
-
+/* This option is defined if the board driver allocates its own buffers
+   (e.g. because it needs them DMA-coherent */
+#define NAND_OWN_BUFFERS        0x00040000
 /* Options set by nand scan */
 /* Nand scan has allocated controller struct */
 #define NAND_CONTROLLER_ALLOC   0x80000000
@@ -385,7 +387,7 @@ struct nand_chip {
         struct nand_ecclayout   *ecclayout;
 
         struct nand_ecc_ctrl ecc;
-        struct nand_buffers buffers;
+        struct nand_buffers *buffers;
         struct nand_hw_control hwcontrol;
 
         struct mtd_oob_ops ops;