projects / deliverable / linux.git / blame
| Commit | Line | Data |
|---|---|---|
| bc6b1e7b DM |
1 | Device tree bindings for GPMC connected NANDs |
| 2 | ||
| 3 | GPMC connected NAND (found on OMAP boards) are represented as child nodes of | |
| 4 | the GPMC controller with a name of "nand". | |
| 5 | ||
| 6 | All timing relevant properties as well as generic gpmc child properties are | |
| 7 | explained in a separate documents - please refer to | |
| 8 | Documentation/devicetree/bindings/bus/ti-gpmc.txt | |
| 9 | ||
| 10 | For NAND specific properties such as ECC modes or bus width, please refer to | |
| 11 | Documentation/devicetree/bindings/mtd/nand.txt | |
| 12 | ||
| 13 | ||
| 14 | Required properties: | |
| 15 | ||
| 16 | - reg: The CS line the peripheral is connected to | |
| 17 | ||
| 18 | Optional properties: | |
| 19 | ||
| 20 | - nand-bus-width: Set this numeric value to 16 if the hardware | |
| 21 | is wired that way. If not specified, a bus | |
| 22 | width of 8 is assumed. | |
| 23 | ||
| 24 | - ti,nand-ecc-opt: A string setting the ECC layout to use. One of: | |
| 25 | ||
| 26 | "sw" Software method (default) | |
| 27 | "hw" Hardware method | |
| 28 | "hw-romcode" gpmc hamming mode method & romcode layout | |
| 29 | "bch4" 4-bit BCH ecc code | |
| 30 | "bch8" 8-bit BCH ecc code | |
| 31 | ||
| 97c794a1 PA |
32 | - elm_id: Specifies elm device node. This is required to support BCH |
| 33 | error correction using ELM module. | |
| 34 | ||
| bc6b1e7b DM |
35 | For inline partiton table parsing (optional): |
| 36 | ||
| 37 | - #address-cells: should be set to 1 | |
| 38 | - #size-cells: should be set to 1 | |
| 39 | ||
| 40 | Example for an AM33xx board: | |
| 41 | ||
| 42 | gpmc: gpmc@50000000 { | |
| 43 | compatible = "ti,am3352-gpmc"; | |
| 44 | ti,hwmods = "gpmc"; | |
| 45 | reg = <0x50000000 0x1000000>; | |
| 46 | interrupts = <100>; | |
| 47 | gpmc,num-cs = <8>; | |
| 48 | gpmc,num-waitpins = <2>; | |
| 49 | #address-cells = <2>; | |
| 50 | #size-cells = <1>; | |
| 51 | ranges = <0 0 0x08000000 0x2000>; /* CS0: NAND */ | |
| 97c794a1 | 52 | elm_id = <&elm>; |
| bc6b1e7b DM |
53 | |
| 54 | nand@0,0 { | |
| 55 | reg = <0 0 0>; /* CS0, offset 0 */ | |
| 56 | nand-bus-width = <16>; | |
| 57 | ti,nand-ecc-opt = "bch8"; | |
| 58 | ||
| 59 | gpmc,sync-clk = <0>; | |
| 60 | gpmc,cs-on = <0>; | |
| 61 | gpmc,cs-rd-off = <44>; | |
| 62 | gpmc,cs-wr-off = <44>; | |
| 63 | gpmc,adv-on = <6>; | |
| 64 | gpmc,adv-rd-off = <34>; | |
| 65 | gpmc,adv-wr-off = <44>; | |
| 66 | gpmc,we-off = <40>; | |
| 67 | gpmc,oe-off = <54>; | |
| 68 | gpmc,access = <64>; | |
| 69 | gpmc,rd-cycle = <82>; | |
| 70 | gpmc,wr-cycle = <82>; | |
| 71 | gpmc,wr-access = <40>; | |
| 72 | gpmc,wr-data-mux-bus = <0>; | |
| 73 | ||
| 74 | #address-cells = <1>; | |
| 75 | #size-cells = <1>; | |
| 76 | ||
| 77 | /* partitions go here */ | |
| 78 | }; | |
| 79 | }; | |
| 80 |