1 ============================================== 1 ======================================================================
2 Device tree bindings for Aspeed AST2400/AST250 2 Device tree bindings for Aspeed AST2400/AST2500 PCI-to-AHB Bridge Control Driver
3 ============================================== 3 ======================================================================
4 4
5 The bridge is available on platforms with the 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 w 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 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, 8 has read access to all the regions of memory, however the host only has read
9 and write access depending on a register contr 9 and write access depending on a register controlled by the BMC.
10 10
11 Required properties: 11 Required properties:
12 =================== 12 ===================
13 13
14 - compatible: must be one of: 14 - compatible: must be one of:
15 - "aspeed,ast2400-p2a-ctrl" 15 - "aspeed,ast2400-p2a-ctrl"
16 - "aspeed,ast2500-p2a-ctrl" 16 - "aspeed,ast2500-p2a-ctrl"
17 17
18 Optional properties: 18 Optional properties:
19 =================== 19 ===================
20 20
21 - reg: A hint for the memory regions associate 21 - reg: A hint for the memory regions associated with the P2A controller
22 - memory-region: A phandle to a reserved_memor 22 - memory-region: A phandle to a reserved_memory region to be used for the PCI
23 to AHB mapping 23 to AHB mapping
24 24
25 The p2a-control node should be the child of a 25 The p2a-control node should be the child of a syscon node with the required
26 property: 26 property:
27 27
28 - compatible : Should be one of the following: 28 - compatible : Should be one of the following:
29 "aspeed,ast2400-scu", "syscon" 29 "aspeed,ast2400-scu", "syscon", "simple-mfd"
30 "aspeed,ast2500-scu", "syscon" 30 "aspeed,ast2500-scu", "syscon", "simple-mfd"
31 31
32 Example 32 Example
33 =================== 33 ===================
34 34
35 g4 Example 35 g4 Example
36 ---------- 36 ----------
37 37
38 syscon: scu@1e6e2000 { 38 syscon: scu@1e6e2000 {
39 compatible = "aspeed,ast2400-scu", "sy 39 compatible = "aspeed,ast2400-scu", "syscon", "simple-mfd";
40 reg = <0x1e6e2000 0x1a8>; 40 reg = <0x1e6e2000 0x1a8>;
41 41
42 p2a: p2a-control { 42 p2a: p2a-control {
43 compatible = "aspeed,ast2400-p 43 compatible = "aspeed,ast2400-p2a-ctrl";
44 memory-region = <&reserved_mem 44 memory-region = <&reserved_memory>;
45 }; 45 };
46 }; 46 };
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