diff options
Diffstat (limited to 'Documentation/devicetree/bindings/bus/uniphier-system-bus.txt')
-rw-r--r-- | Documentation/devicetree/bindings/bus/uniphier-system-bus.txt | 66 |
1 files changed, 0 insertions, 66 deletions
diff --git a/Documentation/devicetree/bindings/bus/uniphier-system-bus.txt b/Documentation/devicetree/bindings/bus/uniphier-system-bus.txt deleted file mode 100644 index 68ef80afff16..000000000000 --- a/Documentation/devicetree/bindings/bus/uniphier-system-bus.txt +++ /dev/null @@ -1,66 +0,0 @@ -UniPhier System Bus - -The UniPhier System Bus is an external bus that connects on-board devices to -the UniPhier SoC. It is a simple (semi-)parallel bus with address, data, and -some control signals. It supports up to 8 banks (chip selects). - -Before any access to the bus, the bus controller must be configured; the bus -controller registers provide the control for the translation from the offset -within each bank to the CPU-viewed address. The needed setup includes the base -address, the size of each bank. Optionally, some timing parameters can be -optimized for faster bus access. - -Required properties: -- compatible: should be "socionext,uniphier-system-bus". -- reg: offset and length of the register set for the bus controller device. -- #address-cells: should be 2. The first cell is the bank number (chip select). - The second cell is the address offset within the bank. -- #size-cells: should be 1. -- ranges: should provide a proper address translation from the System Bus to - the parent bus. - -Note: -The address region(s) that can be assigned for the System Bus is implementation -defined. Some SoCs can use 0x00000000-0x0fffffff and 0x40000000-0x4fffffff, -while other SoCs can only use 0x40000000-0x4fffffff. There might be additional -limitations depending on SoCs and the boot mode. The address translation is -arbitrary as long as the banks are assigned in the supported address space with -the required alignment and they do not overlap one another. -For example, it is possible to map: - bank 0 to 0x42000000-0x43ffffff, bank 5 to 0x46000000-0x46ffffff -It is also possible to map: - bank 0 to 0x48000000-0x49ffffff, bank 5 to 0x44000000-0x44ffffff -There is no reason to stick to a particular translation mapping, but the -"ranges" property should provide a "reasonable" default that is known to work. -The software should initialize the bus controller according to it. - -Example: - - system-bus { - compatible = "socionext,uniphier-system-bus"; - reg = <0x58c00000 0x400>; - #address-cells = <2>; - #size-cells = <1>; - ranges = <1 0x00000000 0x42000000 0x02000000 - 5 0x00000000 0x46000000 0x01000000>; - - ethernet@1,01f00000 { - compatible = "smsc,lan9115"; - reg = <1 0x01f00000 0x1000>; - interrupts = <0 48 4> - phy-mode = "mii"; - }; - - uart@5,00200000 { - compatible = "ns16550a"; - reg = <5 0x00200000 0x20>; - interrupts = <0 49 4> - clock-frequency = <12288000>; - }; - }; - -In this example, - - the Ethernet device is connected at the offset 0x01f00000 of CS1 and - mapped to 0x43f00000 of the parent bus. - - the UART device is connected at the offset 0x00200000 of CS5 and - mapped to 0x46200000 of the parent bus. |