Documentation/devicetree/bindings/mtd/gpmi-nand.txt

   1 * Freescale General-Purpose Media Interface (GPMI)
   2
   3 The GPMI nand controller provides an interface to control the
   4 NAND flash chips.
   5
   6 Required properties:
   7   - compatible : should be "fsl,<chip>-gpmi-nand"
   8   - reg : should contain registers location and length for gpmi and bch.
   9   - reg-names: Should contain the reg names "gpmi-nand" and "bch"
  10   - interrupts : BCH interrupt number.
  11   - interrupt-names : Should be "bch".
  12   - dmas: DMA specifier, consisting of a phandle to DMA controller node
  13     and GPMI DMA channel ID.
  14     Refer to dma.txt and fsl-mxs-dma.txt for details.
  15   - dma-names: Must be "rx-tx".
  16
  17 Optional properties:
  18   - nand-on-flash-bbt: boolean to enable on flash bbt option if not
  19                        present false
  20   - fsl,use-minimum-ecc: Protect this NAND flash with the minimum ECC
  21                        strength required. The required ECC strength is
  22                        automatically discoverable for some flash
  23                        (e.g., according to the ONFI standard).
  24                        However, note that if this strength is not
  25                        discoverable or this property is not enabled,
  26                        the software may chooses an implementation-defined
  27                        ECC scheme.
  28   - fsl,no-blockmark-swap: Don't swap the bad block marker from the OOB
  29                        area with the byte in the data area but rely on the
  30                        flash based BBT for identifying bad blocks.
  31                        NOTE: this is only valid in conjunction with
  32                              'nand-on-flash-bbt'.
  33                        WARNING: on i.MX28 blockmark swapping cannot be
  34                        disabled for the BootROM in the FCB. Thus,
  35                        partitions written from Linux with this feature
  36                        turned on may not be accessible by the BootROM
  37                        code.
  38
  39 The device tree may optionally contain sub-nodes describing partitions of the
  40 address space. See partition.txt for more detail.
  41
  42 Examples:
  43
  44 gpmi-nand@8000c000 {
  45         compatible = "fsl,imx28-gpmi-nand";
  46         #address-cells = <1>;
  47         #size-cells = <1>;
  48         reg = <0x8000c000 2000>, <0x8000a000 2000>;
  49         reg-names = "gpmi-nand", "bch";
  50         interrupts = <41>;
  51         interrupt-names = "bch";
  52         dmas = <&dma_apbh 4>;
  53         dma-names = "rx-tx";
  54
  55         partition@0 {
  56         ...
  57         };
  58 };