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