1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
|
ARM Broadcom STB platforms Device Tree Bindings
-----------------------------------------------
Boards with Broadcom Brahma15 ARM-based BCMxxxx (generally BCM7xxx variants)
SoC shall have the following DT organization:
Required root node properties:
- compatible: "brcm,bcm<chip_id>", "brcm,brcmstb"
example:
/ {
#address-cells = <2>;
#size-cells = <2>;
model = "Broadcom STB (bcm7445)";
compatible = "brcm,bcm7445", "brcm,brcmstb";
Further, syscon nodes that map platform-specific registers used for general
system control is required:
- compatible: "brcm,bcm<chip_id>-sun-top-ctrl", "syscon"
- compatible: "brcm,bcm<chip_id>-hif-cpubiuctrl", "syscon"
- compatible: "brcm,bcm<chip_id>-hif-continuation", "syscon"
example:
rdb {
#address-cells = <1>;
#size-cells = <1>;
compatible = "simple-bus";
ranges = <0 0x00 0xf0000000 0x1000000>;
sun_top_ctrl: syscon@404000 {
compatible = "brcm,bcm7445-sun-top-ctrl", "syscon";
reg = <0x404000 0x51c>;
};
hif_cpubiuctrl: syscon@3e2400 {
compatible = "brcm,bcm7445-hif-cpubiuctrl", "syscon";
reg = <0x3e2400 0x5b4>;
};
hif_continuation: syscon@452000 {
compatible = "brcm,bcm7445-hif-continuation", "syscon";
reg = <0x452000 0x100>;
};
};
Lastly, nodes that allow for support of SMP initialization and reboot are
required:
smpboot
-------
Required properties:
- compatible
The string "brcm,brcmstb-smpboot".
- syscon-cpu
A phandle / integer array property which lets the BSP know the location
of certain CPU power-on registers.
The layout of the property is as follows:
o a phandle to the "hif_cpubiuctrl" syscon node
o offset to the base CPU power zone register
o offset to the base CPU reset register
- syscon-cont
A phandle pointing to the syscon node which describes the CPU boot
continuation registers.
o a phandle to the "hif_continuation" syscon node
example:
smpboot {
compatible = "brcm,brcmstb-smpboot";
syscon-cpu = <&hif_cpubiuctrl 0x88 0x178>;
syscon-cont = <&hif_continuation>;
};
reboot
-------
Required properties
- compatible
The string property "brcm,brcmstb-reboot" for 40nm/28nm chips with
the new SYS_CTRL interface, or "brcm,bcm7038-reboot" for 65nm
chips with the old SUN_TOP_CTRL interface.
- syscon
A phandle / integer array that points to the syscon node which describes
the general system reset registers.
o a phandle to "sun_top_ctrl"
o offset to the "reset source enable" register
o offset to the "software master reset" register
example:
reboot {
compatible = "brcm,brcmstb-reboot";
syscon = <&sun_top_ctrl 0x304 0x308>;
};
|
