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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 | |||
32 | - elm_id: Specifies elm device node. This is required to support BCH | ||
33 | error correction using ELM module. | ||
34 | |||
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 */ | ||
52 | elm_id = <&elm>; | ||
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 | |||