mtd: gpmi: make blockmark swapping optional

With a flash-based BBT there is no reason to move the Factory Bad
Block Marker from the data area buffer (to where it is mapped by the
GPMI NAND controller) to the OOB buffer. Thus, make this feature
configurable via DT. This is required for the Ka-Ro electronics
platforms.

In the original code 'this->swap_block_mark' was synonymous with
'!GPMI_IS_MX23()', so use the latter at the relevant places.

Signed-off-by: Lothar Waßmann <LW@KARO-electronics.de>
Acked-by: Huang Shijie <b32955@freescale.com>
Signed-off-by: Brian Norris <computersforpeace@gmail.com>

1 files changed, 10 insertions, 0 deletions

diff --git a/Documentation/devicetree/bindings/mtd/gpmi-nand.txt b/Documentation/devicetree/bindings/mtd/gpmi-nand.txt
index 458d5963468..a011fdf61db 100644
--- a/Documentation/devicetree/bindings/mtd/gpmi-nand.txt
+++ b/Documentation/devicetree/bindings/mtd/gpmi-nand.txt
@@ -25,6 +25,16 @@ Optional properties:
                        discoverable or this property is not enabled,
                        the software may chooses an implementation-defined
                        ECC scheme.
+  - fsl,no-blockmark-swap: Don't swap the bad block marker from the OOB
+                       area with the byte in the data area but rely on the
+                       flash based BBT for identifying bad blocks.
+                       NOTE: this is only valid in conjunction with
+                             'nand-on-flash-bbt'.
+                       WARNING: on i.MX28 blockmark swapping cannot be
+                       disabled for the BootROM in the FCB. Thus,
+                       partitions written from Linux with this feature
+                       turned on may not be accessible by the BootROM
+                       code.
 
 The device tree may optionally contain sub-nodes describing partitions of the
 address space. See partition.txt for more detail.