Marvell Device bus (localbus) configuration.
============================================
1. Properties for localbus nodes
1.1 ranges
Property: ranges
Value type: <prop-encoded-array> encoded as arbitrary number of localbus
nodes specifiers.
Description: ranges property defines values used for mapping devices
connected to localbus, in Marvell devices it is used also for
setting decoding windows.
a) child node address-cells:
- first cell: number of bank (chip select)
- second cell: (Marvell devices) Target ID for decoding
windows setup
b) parent node address cells:
- address offset: used with parent's node base address to
specify base address of mapped device
c) child node size-cells:
- size: defines amount of memory that should be reserved for
device
1.2 bank-count
Property: bank-count
Value type: <u32>
Description: The bank_count property defines maximum number of banks on
localbus node. Bank is most often interpreted as device chip
select, but may also describe another device (e.g. SPI flash).
1.3 Example
localbus@0 {
#address-cells = <2>;
#size-cells = <1>;
compatible = "mrvl,lbc";
bank-count = <5>;
/* This reflects CPU decode windows setup. */
ranges = <0x0 0x2f 0xb2200000 0x00100000
0x1 0x3e 0xb2100000 0x00100000
0x2 0x3d 0xb0000000 0x02000000
0x3 0x3b 0xb2000000 0x00100000>;
};
2. Properties for localbus consumer nodes:
2.1 reg
Property: reg
Value type: <prop-encoded-array>
Description: A standard property required for localbus child nodes. Defines
the device memory region.
a) first cell: number of bank (chip select)
b) address offset: used with address offset from parent's ranges
for corresponding bank to specify base address of
the device
c) size: defines size of the device memory region
2.2 Example
nor@0,0 {
#address-cells = <1>;
#size-cells = <1>;
compatible = "cfi-flash";
reg = <0x0 0x0 0x00100000>;
};
