gpmi-nand.txt

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    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", chip can be:
    8     * imx23
    9     * imx28
   10     * imx6q
   11     * imx6sx
   12     * imx7d
   13   - reg : should contain registers location and length for gpmi and bch.
   14   - reg-names: Should contain the reg names "gpmi-nand" and "bch"
   15   - interrupts : BCH interrupt number.
   16   - interrupt-names : Should be "bch".
   17   - dmas: DMA specifier, consisting of a phandle to DMA controller node
   18     and GPMI DMA channel ID.
   19     Refer to dma.txt and fsl-mxs-dma.txt for details.
   20   - dma-names: Must be "rx-tx".
   21   - clocks : clocks phandle and clock specifier corresponding to each clock
   22     specified in clock-names.
   23   - clock-names : The "gpmi_io" clock is always required. Which clocks are
   24     exactly required depends on chip:
   25     * imx23/imx28 : "gpmi_io"
   26     * imx6q/sx : "gpmi_io", "gpmi_apb", "gpmi_bch", "gpmi_bch_apb", "per1_bch"
   27     * imx7d : "gpmi_io", "gpmi_bch_apb"
   28 
   29 Optional properties:
   30   - nand-on-flash-bbt: boolean to enable on flash bbt option if not
   31                        present false
   32   - fsl,use-minimum-ecc: Protect this NAND flash with the minimum ECC
   33                        strength required. The required ECC strength is
   34                        automatically discoverable for some flash
   35                        (e.g., according to the ONFI standard).
   36                        However, note that if this strength is not
   37                        discoverable or this property is not enabled,
   38                        the software may chooses an implementation-defined
   39                        ECC scheme.
   40   - fsl,no-blockmark-swap: Don't swap the bad block marker from the OOB
   41                        area with the byte in the data area but rely on the
   42                        flash based BBT for identifying bad blocks.
   43                        NOTE: this is only valid in conjunction with
   44                              'nand-on-flash-bbt'.
   45                        WARNING: on i.MX28 blockmark swapping cannot be
   46                        disabled for the BootROM in the FCB. Thus,
   47                        partitions written from Linux with this feature
   48                        turned on may not be accessible by the BootROM
   49                        code.
   50   - nand-ecc-strength: integer representing the number of bits to correct
   51                        per ECC step. Needs to be a multiple of 2.
   52   - nand-ecc-step-size: integer representing the number of data bytes
   53                        that are covered by a single ECC step. The driver
   54                        supports 512 and 1024.
   55 
   56 The device tree may optionally contain sub-nodes describing partitions of the
   57 address space. See partition.txt for more detail.
   58 
   59 Examples:
   60 
   61 gpmi-nand@8000c000 {
   62         compatible = "fsl,imx28-gpmi-nand";
   63         #address-cells = <1>;
   64         #size-cells = <1>;
   65         reg = <0x8000c000 2000>, <0x8000a000 2000>;
   66         reg-names = "gpmi-nand", "bch";
   67         interrupts = <41>;
   68         interrupt-names = "bch";
   69         dmas = <&dma_apbh 4>;
   70         dma-names = "rx-tx";
   71 
   72         partition@0 {
   73         ...
   74         };
   75 };

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FreeBSD/Linux Kernel Cross Reference sys/contrib/device-tree/Bindings/mtd/gpmi-nand.txt

FreeBSD/Linux Kernel Cross Reference
sys/contrib/device-tree/Bindings/mtd/gpmi-nand.txt