* Freescale General-Purpose Media Interface (GPMI)

The GPMI nand controller provides an interface to control the
NAND flash chips. We support only one NAND chip now.

Required properties:
  - compatible : should be "fsl,<chip>-gpmi-nand"
  - reg : should contain registers location and length for gpmi and bch.
  - reg-names: Should contain the reg names "gpmi-nand" and "bch"
  - interrupts : BCH interrupt number.
  - interrupt-names : Should be "bch".
  - dmas: DMA specifier, consisting of a phandle to DMA controller node
    and GPMI DMA channel ID.
    Refer to dma.txt and fsl-mxs-dma.txt for details.
  - dma-names: Must be "rx-tx".

Optional properties:
  - nand-on-flash-bbt: boolean to enable on flash bbt option if not
                       present false
  - fsl,use-minimum-ecc: Protect this NAND flash with the minimum ECC
                       strength required. The required ECC strength is
                       automatically discoverable for some flash
                       (e.g., according to the ONFI standard).
                       However, note that if this strength is not
                       discoverable or this property is not enabled,
                       the software may chooses an implementation-defined
                       ECC scheme.

The device tree may optionally contain sub-nodes describing partitions of the
address space. See partition.txt for more detail.

Examples:

gpmi-nand@8000c000 {
	compatible = "fsl,imx28-gpmi-nand";
	#address-cells = <1>;
	#size-cells = <1>;
	reg = <0x8000c000 2000>, <0x8000a000 2000>;
	reg-names = "gpmi-nand", "bch";
	interrupts = <41>;
	interrupt-names = "bch";
	dmas = <&dma_apbh 4>;
	dma-names = "rx-tx";

	partition@0 {
	...
	};
};