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1 ARM Broadcom STB platforms Device Tree Bindings
2 -----------------------------------------------
3 Boards with Broadcom Brahma15 ARM-based BCMxxxx (generally BCM7xxx variants)
4 SoC shall have the following DT organization:
6 Required root node properties:
7     - compatible: "brcm,bcm<chip_id>", "brcm,brcmstb"
9 example:
10 / {
11     #address-cells = <2>;
12     #size-cells = <2>;
13     model = "Broadcom STB (bcm7445)";
14     compatible = "brcm,bcm7445", "brcm,brcmstb";
16 Further, syscon nodes that map platform-specific registers used for general
17 system control is required:
19     - compatible: "brcm,bcm<chip_id>-sun-top-ctrl", "syscon"
20     - compatible: "brcm,bcm<chip_id>-cpu-biu-ctrl",
21                   "brcm,brcmstb-cpu-biu-ctrl",
22                   "syscon"
23     - compatible: "brcm,bcm<chip_id>-hif-continuation", "syscon"
25 cpu-biu-ctrl node
26 -------------------
27 SoCs with Broadcom Brahma15 ARM-based and Brahma53 ARM64-based CPUs have a
28 specific Bus Interface Unit (BIU) block which controls and interfaces the CPU
29 complex to the different Memory Controller Ports (MCP), one per memory
30 controller (MEMC). This BIU block offers a feature called Write Pairing which
31 consists in collapsing two adjacent cache lines into a single (bursted) write
32 transaction towards the memory controller (MEMC) to maximize write bandwidth.
34 Required properties:
36     - compatible: must be "brcm,bcm7445-cpu-biu-ctrl", "brcm,brcmstb-cpu-biu-ctrl", "syscon"
38 Optional properties:
40     - brcm,write-pairing:
41         Boolean property, which when present indicates that the chip
42         supports write-pairing.
44 example:
45     rdb {
46         #address-cells = <1>;
47         #size-cells = <1>;
48         compatible = "simple-bus";
49         ranges = <0 0x00 0xf0000000 0x1000000>;
51         sun_top_ctrl: syscon@404000 {
52             compatible = "brcm,bcm7445-sun-top-ctrl", "syscon";
53             reg = <0x404000 0x51c>;
54         };
56         hif_cpubiuctrl: syscon@3e2400 {
57             compatible = "brcm,bcm7445-cpu-biu-ctrl", "brcm,brcmstb-cpu-biu-ctrl", "syscon";
58             reg = <0x3e2400 0x5b4>;
59             brcm,write-pairing;
60         };
62         hif_continuation: syscon@452000 {
63             compatible = "brcm,bcm7445-hif-continuation", "syscon";
64             reg = <0x452000 0x100>;
65         };
66     };
68 Nodes that allow for support of SMP initialization and reboot are required:
70 smpboot
71 -------
72 Required properties:
74     - compatible
75         The string "brcm,brcmstb-smpboot".
77     - syscon-cpu
78         A phandle / integer array property which lets the BSP know the location
79         of certain CPU power-on registers.
81         The layout of the property is as follows:
82             o a phandle to the "hif_cpubiuctrl" syscon node
83             o offset to the base CPU power zone register
84             o offset to the base CPU reset register
86     - syscon-cont
87         A phandle pointing to the syscon node which describes the CPU boot
88         continuation registers.
89             o a phandle to the "hif_continuation" syscon node
91 example:
92     smpboot {
93         compatible = "brcm,brcmstb-smpboot";
94         syscon-cpu = <&hif_cpubiuctrl 0x88 0x178>;
95         syscon-cont = <&hif_continuation>;
96     };
98 reboot
99 -------
100 Required properties
102     - compatible
103         The string property "brcm,brcmstb-reboot" for 40nm/28nm chips with
104         the new SYS_CTRL interface, or "brcm,bcm7038-reboot" for 65nm
105         chips with the old SUN_TOP_CTRL interface.
107     - syscon
108         A phandle / integer array that points to the syscon node which describes
109         the general system reset registers.
110             o a phandle to "sun_top_ctrl"
111             o offset to the "reset source enable" register
112             o offset to the "software master reset" register
114 example:
115     reboot {
116         compatible = "brcm,brcmstb-reboot";
117         syscon = <&sun_top_ctrl 0x304 0x308>;
118     };
122 Power management
123 ----------------
125 For power management (particularly, S2/S3/S5 system suspend), the following SoC
126 components are needed:
128 = Always-On control block (AON CTRL)
130 This hardware provides control registers for the "always-on" (even in low-power
131 modes) hardware, such as the Power Management State Machine (PMSM).
133 Required properties:
134 - compatible     : should contain "brcm,brcmstb-aon-ctrl"
135 - reg            : the register start and length for the AON CTRL block
137 Example:
139 aon-ctrl@410000 {
140         compatible = "brcm,brcmstb-aon-ctrl";
141         reg = <0x410000 0x400>;
144 = Memory controllers
146 A Broadcom STB SoC typically has a number of independent memory controllers,
147 each of which may have several associated hardware blocks, which are versioned
148 independently (control registers, DDR PHYs, etc.). One might consider
149 describing these controllers as a parent "memory controllers" block, which
150 contains N sub-nodes (one for each controller in the system), each of which is
151 associated with a number of hardware register resources (e.g., its PHY). See
152 the example device tree snippet below.
154 == MEMC (MEMory Controller)
156 Represents a single memory controller instance.
158 Required properties:
159 - compatible     : should contain "brcm,brcmstb-memc" and "simple-bus"
161 Should contain subnodes for any of the following relevant hardware resources:
163 == DDR PHY control
165 Control registers for this memory controller's DDR PHY.
167 Required properties:
168 - compatible     : should contain one of these
169         "brcm,brcmstb-ddr-phy-v71.1"
170         "brcm,brcmstb-ddr-phy-v72.0"
171         "brcm,brcmstb-ddr-phy-v225.1"
172         "brcm,brcmstb-ddr-phy-v240.1"
173         "brcm,brcmstb-ddr-phy-v240.2"
175 - reg            : the DDR PHY register range
177 == DDR SHIMPHY
179 Control registers for this memory controller's DDR SHIMPHY.
181 Required properties:
182 - compatible     : should contain "brcm,brcmstb-ddr-shimphy-v1.0"
183 - reg            : the DDR SHIMPHY register range
185 == MEMC DDR control
187 Sequencer DRAM parameters and control registers. Used for Self-Refresh
188 Power-Down (SRPD), among other things.
190 Required properties:
191 - compatible     : should contain one of these
192         "brcm,brcmstb-memc-ddr-rev-b.2.2"
193         "brcm,brcmstb-memc-ddr"
194 - reg            : the MEMC DDR register range
196 Example:
198 memory_controllers {
199         ranges;
200         compatible = "simple-bus";
202         memc@0 {
203                 compatible = "brcm,brcmstb-memc", "simple-bus";
204                 ranges;
206                 ddr-phy@f1106000 {
207                         compatible = "brcm,brcmstb-ddr-phy-v240.1";
208                         reg = <0xf1106000 0x21c>;
209                 };
211                 shimphy@f1108000 {
212                         compatible = "brcm,brcmstb-ddr-shimphy-v1.0";
213                         reg = <0xf1108000 0xe4>;
214                 };
216                 memc-ddr@f1102000 {
217                         reg = <0xf1102000 0x800>;
218                         compatible = "brcm,brcmstb-memc-ddr";
219                 };
220         };
222         memc@1 {
223                 compatible = "brcm,brcmstb-memc", "simple-bus";
224                 ranges;
226                 ddr-phy@f1186000 {
227                         compatible = "brcm,brcmstb-ddr-phy-v240.1";
228                         reg = <0xf1186000 0x21c>;
229                 };
231                 shimphy@f1188000 {
232                         compatible = "brcm,brcmstb-ddr-shimphy-v1.0";
233                         reg = <0xf1188000 0xe4>;
234                 };
236                 memc-ddr@f1182000 {
237                         reg = <0xf1182000 0x800>;
238                         compatible = "brcm,brcmstb-memc-ddr";
239                 };
240         };
242         memc@2 {
243                 compatible = "brcm,brcmstb-memc", "simple-bus";
244                 ranges;
246                 ddr-phy@f1206000 {
247                         compatible = "brcm,brcmstb-ddr-phy-v240.1";
248                         reg = <0xf1206000 0x21c>;
249                 };
251                 shimphy@f1208000 {
252                         compatible = "brcm,brcmstb-ddr-shimphy-v1.0";
253                         reg = <0xf1208000 0xe4>;
254                 };
256                 memc-ddr@f1202000 {
257                         reg = <0xf1202000 0x800>;
258                         compatible = "brcm,brcmstb-memc-ddr";
259                 };
260         };