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