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- $FreeBSD$
- 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>;
- };
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