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