xref: /freebsd/sys/contrib/device-tree/Bindings/mips/brcm/soc.txt (revision 02e9120893770924227138ba49df1edb3896112a) 
1* Broadcom cable/DSL/settop platforms
2
3Required properties:
4
5- compatible: "brcm,bcm3368", "brcm,bcm3384", "brcm,bcm33843"
6              "brcm,bcm3384-viper", "brcm,bcm33843-viper"
7              "brcm,bcm6328", "brcm,bcm6358", "brcm,bcm6362", "brcm,bcm6368",
8              "brcm,bcm63168", "brcm,bcm63268",
9              "brcm,bcm7125", "brcm,bcm7346", "brcm,bcm7358", "brcm,bcm7360",
10              "brcm,bcm7362", "brcm,bcm7420", "brcm,bcm7425"
11
12The experimental -viper variants are for running Linux on the 3384's
13BMIPS4355 cable modem CPU instead of the BMIPS5000 application processor.
14
15Power management
16----------------
17
18For power management (particularly, S2/S3/S5 system suspend), the following SoC
19components are needed:
20
21= Always-On control block (AON CTRL)
22
23This hardware provides control registers for the "always-on" (even in low-power
24modes) hardware, such as the Power Management State Machine (PMSM).
25
26Required properties:
27- compatible     : should be one of
28		   "brcm,bcm7425-aon-ctrl"
29		   "brcm,bcm7429-aon-ctrl"
30		   "brcm,bcm7435-aon-ctrl" and
31		   "brcm,brcmstb-aon-ctrl"
32- reg            : the register start and length for the AON CTRL block
33
34Example:
35
36syscon@410000 {
37	compatible = "brcm,bcm7425-aon-ctrl", "brcm,brcmstb-aon-ctrl";
38	reg = <0x410000 0x400>;
39};
40
41= Memory controllers
42
43A Broadcom STB SoC typically has a number of independent memory controllers,
44each of which may have several associated hardware blocks, which are versioned
45independently (control registers, DDR PHYs, etc.). One might consider
46describing these controllers as a parent "memory controllers" block, which
47contains N sub-nodes (one for each controller in the system), each of which is
48associated with a number of hardware register resources (e.g., its PHY.
49
50== MEMC (MEMory Controller)
51
52Represents a single memory controller instance.
53
54Required properties:
55- compatible     : should contain "brcm,brcmstb-memc" and "simple-bus"
56- ranges	 : should contain the child address in the parent address
57		   space, must be 0 here, and the register start and length of
58		   the entire memory controller (including all sub nodes: DDR PHY,
59		   arbiter, etc.)
60- #address-cells : must be 1
61- #size-cells	 : must be 1
62
63Example:
64
65	memory-controller@0 {
66		compatible = "brcm,brcmstb-memc", "simple-bus";
67		ranges = <0x0 0x0 0xa000>;
68		#address-cells = <1>;
69		#size-cells = <1>;
70
71		memc-arb@1000 {
72			...
73		};
74
75		memc-ddr@2000 {
76			...
77		};
78
79		ddr-phy@6000 {
80			...
81		};
82	};
83
84Should contain subnodes for any of the following relevant hardware resources:
85
86== DDR PHY control
87
88Control registers for this memory controller's DDR PHY.
89
90Required properties:
91- compatible     : should contain one of these
92		   "brcm,brcmstb-ddr-phy-v64.5"
93		   "brcm,brcmstb-ddr-phy"
94
95- reg            : the DDR PHY register range and length
96
97Example:
98
99	ddr-phy@6000 {
100		compatible = "brcm,brcmstb-ddr-phy-v64.5";
101		reg = <0x6000 0xc8>;
102	};
103
104== DDR memory controller sequencer
105
106Control registers for this memory controller's DDR memory sequencer
107
108Required properties:
109- compatible     : should contain one of these
110		   "brcm,bcm7425-memc-ddr"
111		   "brcm,bcm7429-memc-ddr"
112		   "brcm,bcm7435-memc-ddr" and
113		   "brcm,brcmstb-memc-ddr"
114
115- reg            : the DDR sequencer register range and length
116
117Example:
118
119	memc-ddr@2000 {
120		compatible = "brcm,bcm7425-memc-ddr", "brcm,brcmstb-memc-ddr";
121		reg = <0x2000 0x300>;
122	};
123
124== MEMC Arbiter
125
126The memory controller arbiter is responsible for memory clients allocation
127(bandwidth, priorities etc.) and needs to have its contents restored during
128deep sleep states (S3).
129
130Required properties:
131
132- compatible	: should contain one of these
133		  "brcm,brcmstb-memc-arb-v10.0.0.0"
134		  "brcm,brcmstb-memc-arb"
135
136- reg		: the DDR Arbiter register range and length
137
138Example:
139
140	memc-arb@1000 {
141		compatible = "brcm,brcmstb-memc-arb-v10.0.0.0";
142		reg = <0x1000 0x248>;
143	};
144
145== Timers
146
147The Broadcom STB chips contain a timer block with several general purpose
148timers that can be used.
149
150Required properties:
151
152- compatible	: should contain one of:
153		  "brcm,bcm7425-timers"
154		  "brcm,bcm7429-timers"
155		  "brcm,bcm7435-timers" and
156		  "brcm,brcmstb-timers"
157- reg		: the timers register range
158- interrupts	: the interrupt line for this timer block
159
160Example:
161
162	timers: timer@4067c0 {
163		compatible = "brcm,bcm7425-timers", "brcm,brcmstb-timers";
164		reg = <0x4067c0 0x40>;
165		interrupts = <&periph_intc 19>;
166	};
167