1 ======================================================================
2 Device tree bindings for Aspeed AST2400/AST2500 PCI-to-AHB Bridge Control Driver
3 ======================================================================
4
5 The bridge is available on platforms with the VGA enabled on the Aspeed device.
6 In this case, the host has access to a 64KiB window into all of the BMC's
7 memory. The BMC can disable this bridge. If the bridge is enabled, the host
8 has read access to all the regions of memory, however the host only has read
9 and write access depending on a register controlled by the BMC.
10
11 Required properties:
12 ===================
13
14 - compatible: must be one of:
15 - "aspeed,ast2400-p2a-ctrl"
16 - "aspeed,ast2500-p2a-ctrl"
17
18 Optional properties:
19 ===================
20
21 - reg: A hint for the memory regions associated with the P2A controller
22 - memory-region: A phandle to a reserved_memory region to be used for the PCI
23 to AHB mapping
24
25 The p2a-control node should be the child of a syscon node with the required
26 property:
27
28 - compatible : Should be one of the following:
29 "aspeed,ast2400-scu", "syscon", "simple-mfd"
30 "aspeed,ast2500-scu", "syscon", "simple-mfd"
31
32 Example
33 ===================
34
35 g4 Example
36 ----------
37
38 syscon: scu@1e6e2000 {
39 compatible = "aspeed,ast2400-scu", "syscon", "simple-mfd";
40 reg = <0x1e6e2000 0x1a8>;
41
42 p2a: p2a-control {
43 compatible = "aspeed,ast2400-p2a-ctrl";
44 memory-region = <&reserved_memory>;
45 };
46 };
Linux® is a registered trademark of Linus Torvalds in the United States and other countries.
TOMOYO® is a registered trademark of NTT DATA CORPORATION.