Kernel-3.10.0-957.el7_gpmc-nan

Device tree bindings for GPMC connected NANDs

GPMC connected NAND (found on OMAP boards) are represented as child nodes of
the GPMC controller with a name of “nand”.

All timing relevant properties as well as generic gpmc child properties are
explained in a separate documents - please refer to
Documentation/devicetree/bindings/bus/ti-gpmc.txt

For NAND specific properties such as ECC modes or bus width, please refer to
Documentation/devicetree/bindings/mtd/nand.txt

Required properties:

• reg: The CS line the peripheral is connected to

Optional properties:

• nand-bus-width: Set this numeric value to 16 if the hardware

           is wired that way. If not specified, a bus
           width of 8 is assumed.
  

• ti,nand-ecc-opt: A string setting the ECC layout to use. One of:

   "sw"        Software method (default)
   "hw"        Hardware method
   "hw-romcode"    gpmc hamming mode method & romcode layout
   "bch4"        4-bit BCH ecc code
   "bch8"        8-bit BCH ecc code
  

• elm_id: Specifies elm device node. This is required to support BCH

    error correction using ELM module.
  

For inline partiton table parsing (optional):

• #address-cells: should be set to 1
• #size-cells: should be set to 1

Example for an AM33xx board:

gpmc: gpmc@50000000 {
    compatible = "ti,am3352-gpmc";
    ti,hwmods = "gpmc";
    reg = <0x50000000 0x1000000>;
    interrupts = <100>;
    gpmc,num-cs = <8>;
    gpmc,num-waitpins = <2>;
    #address-cells = <2>;
    #size-cells = <1>;
    ranges = <0 0 0x08000000 0x2000>;    /* CS0: NAND */
    elm_id = <&elm>;

    nand@0,0 {
        reg = <0 0 0>; /* CS0, offset 0 */
        nand-bus-width = <16>;
        ti,nand-ecc-opt = "bch8";

        gpmc,sync-clk-ps = <0>;
        gpmc,cs-on-ns = <0>;
        gpmc,cs-rd-off-ns = <44>;
        gpmc,cs-wr-off-ns = <44>;
        gpmc,adv-on-ns = <6>;
        gpmc,adv-rd-off-ns = <34>;
        gpmc,adv-wr-off-ns = <44>;
        gpmc,we-off-ns = <40>;
        gpmc,oe-off-ns = <54>;
        gpmc,access-ns = <64>;
        gpmc,rd-cycle-ns = <82>;
        gpmc,wr-cycle-ns = <82>;
        gpmc,wr-access-ns = <40>;
        gpmc,wr-data-mux-bus-ns = <0>;

        #address-cells = <1>;
        #size-cells = <1>;

        /* partitions go here */
    };
};