1 $FreeBSD: releng/11.2/sys/boot/fdt/dts/bindings-localbus.txt 235609 2012-05-18 14:41:14Z gber $
2
3 Marvell Device bus (localbus) configuration.
4 ============================================
5
6 1. Properties for localbus nodes
7
8 1.1 ranges
9
10 Property: ranges
11
12 Value type: <prop-encoded-array> encoded as arbitrary number of localbus
13 nodes specifiers.
14
15 Description: ranges property defines values used for mapping devices
16 connected to localbus, in Marvell devices it is used also for
17 setting decoding windows.
18
19 a) child node address-cells:
20 - first cell: number of bank (chip select)
21 - second cell: (Marvell devices) Target ID for decoding
22 windows setup
23
24 b) parent node address cells:
25 - address offset: used with parent's node base address to
26 specify base address of mapped device
27
28 c) child node size-cells:
29 - size: defines amount of memory that should be reserved for
30 device
31
32 1.2 bank-count
33
34 Property: bank-count
35
36 Value type: <u32>
37
38 Description: The bank_count property defines maximum number of banks on
39 localbus node. Bank is most often interpreted as device chip
40 select, but may also describe another device (e.g. SPI flash).
41
42 1.3 Example
43
44 localbus@0 {
45 #address-cells = <2>;
46 #size-cells = <1>;
47 compatible = "mrvl,lbc";
48 bank-count = <5>;
49
50 /* This reflects CPU decode windows setup. */
51 ranges = <0x0 0x2f 0xb2200000 0x00100000
52 0x1 0x3e 0xb2100000 0x00100000
53 0x2 0x3d 0xb0000000 0x02000000
54 0x3 0x3b 0xb2000000 0x00100000>;
55 };
56
57 2. Properties for localbus consumer nodes:
58
59 2.1 reg
60
61 Property: reg
62
63 Value type: <prop-encoded-array>
64
65 Description: A standard property required for localbus child nodes. Defines
66 the device memory region.
67
68 a) first cell: number of bank (chip select)
69
70 b) address offset: used with address offset from parent's ranges
71 for corresponding bank to specify base address of
72 the device
73
74 c) size: defines size of the device memory region
75
76 2.2 Example
77
78 nor@0,0 {
79 #address-cells = <1>;
80 #size-cells = <1>;
81 compatible = "cfi-flash";
82 reg = <0x0 0x0 0x00100000>;
83 };
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