ARM: OMAP2+: Allow NAND transfer mode to be specified in DT

OMAP devices support various NAND transfer modes.

Currently all device-tree definitions will use the default "prefetch
polled" mode, so this patch enables the transfer mode to be specified
in the device-tree.

Signed-off-by: Mark Jackson <mpfj@newflow.co.uk>
Acked-by: Pekon Gupta <pekon@ti.com>
Signed-off-by: Tony Lindgren <tony@atomide.com>

1 files changed, 8 insertions, 0 deletions

diff --git a/Documentation/devicetree/bindings/mtd/gpmc-nand.txt b/Documentation/devicetree/bindings/mtd/gpmc-nand.txt
index 6a983c1d87cd..df338cb5059c 100644
--- a/Documentation/devicetree/bindings/mtd/gpmc-nand.txt
+++ b/Documentation/devicetree/bindings/mtd/gpmc-nand.txt
@@ -29,6 +29,13 @@ Optional properties:
                 "bch4"          4-bit BCH ecc code
                 "bch8"          8-bit BCH ecc code
 
+ - ti,nand-xfer-type:           A string setting the data transfer type. One of:
+
+                "prefetch-polled"       Prefetch polled mode (default)
+                "polled"                Polled mode, without prefetch
+                "prefetch-dma"          Prefetch enabled sDMA mode
+                "prefetch-irq"          Prefetch enabled irq mode
+
  - elm_id:      Specifies elm device node. This is required to support BCH
                 error correction using ELM module.
 
@@ -55,6 +62,7 @@ Example for an AM33xx board:
                         reg = <0 0 0>; /* CS0, offset 0 */
                         nand-bus-width = <16>;
                         ti,nand-ecc-opt = "bch8";
+                        ti,nand-xfer-type = "polled";
 
                         gpmc,sync-clk-ps = <0>;
                         gpmc,cs-on-ns = <0>;