1 Binding for MediaTek's CPUFreq driver
2 =====================================
3
4 Required properties:
5 - clocks: A list of phandle + clock-specifier pairs for the clocks listed in clock names.
6 - clock-names: Should contain the following:
7 "cpu" - The multiplexer for clock input of CPU cluster.
8 "intermediate" - A parent of "cpu" clock which is used as "intermediate" clock
9 source (usually MAINPLL) when the original CPU PLL is under
10 transition and not stable yet.
11 Please refer to Documentation/devicetree/bindings/clock/clock-bindings.txt for
12 generic clock consumer properties.
13 - operating-points-v2: Please refer to Documentation/devicetree/bindings/opp/opp-v2.yaml
14 for detail.
15 - proc-supply: Regulator for Vproc of CPU cluster.
16
17 Optional properties:
18 - sram-supply: Regulator for Vsram of CPU cluster. When present, the cpufreq driver
19 needs to do "voltage tracking" to step by step scale up/down Vproc and
20 Vsram to fit SoC specific needs. When absent, the voltage scaling
21 flow is handled by hardware, hence no software "voltage tracking" is
22 needed.
23 - mediatek,cci:
24 Used to confirm the link status between cpufreq and mediatek cci. Because
25 cpufreq and mediatek cci could share the same regulator in some MediaTek SoCs.
26 To prevent the issue of high frequency and low voltage, we need to use this
27 property to make sure mediatek cci is ready.
28 For details of mediatek cci, please refer to
29 Documentation/devicetree/bindings/interconnect/mediatek,cci.yaml
30 - #cooling-cells:
31 For details, please refer to
32 Documentation/devicetree/bindings/thermal/thermal-cooling-devices.yaml
33
34 Example 1 (MT7623 SoC):
35
36 cpu_opp_table: opp_table {
37 compatible = "operating-points-v2";
38 opp-shared;
39
40 opp-598000000 {
41 opp-hz = /bits/ 64 <598000000>;
42 opp-microvolt = <1050000>;
43 };
44
45 opp-747500000 {
46 opp-hz = /bits/ 64 <747500000>;
47 opp-microvolt = <1050000>;
48 };
49
50 opp-1040000000 {
51 opp-hz = /bits/ 64 <1040000000>;
52 opp-microvolt = <1150000>;
53 };
54
55 opp-1196000000 {
56 opp-hz = /bits/ 64 <1196000000>;
57 opp-microvolt = <1200000>;
58 };
59
60 opp-1300000000 {
61 opp-hz = /bits/ 64 <1300000000>;
62 opp-microvolt = <1300000>;
63 };
64 };
65
66 cpu0: cpu@0 {
67 device_type = "cpu";
68 compatible = "arm,cortex-a7";
69 reg = <0x0>;
70 clocks = <&infracfg CLK_INFRA_CPUSEL>,
71 <&apmixedsys CLK_APMIXED_MAINPLL>;
72 clock-names = "cpu", "intermediate";
73 operating-points-v2 = <&cpu_opp_table>;
74 #cooling-cells = <2>;
75 };
76 cpu@1 {
77 device_type = "cpu";
78 compatible = "arm,cortex-a7";
79 reg = <0x1>;
80 operating-points-v2 = <&cpu_opp_table>;
81 };
82 cpu@2 {
83 device_type = "cpu";
84 compatible = "arm,cortex-a7";
85 reg = <0x2>;
86 operating-points-v2 = <&cpu_opp_table>;
87 };
88 cpu@3 {
89 device_type = "cpu";
90 compatible = "arm,cortex-a7";
91 reg = <0x3>;
92 operating-points-v2 = <&cpu_opp_table>;
93 };
94
95 Example 2 (MT8173 SoC):
96 cpu_opp_table_a: opp_table_a {
97 compatible = "operating-points-v2";
98 opp-shared;
99
100 opp-507000000 {
101 opp-hz = /bits/ 64 <507000000>;
102 opp-microvolt = <859000>;
103 };
104
105 opp-702000000 {
106 opp-hz = /bits/ 64 <702000000>;
107 opp-microvolt = <908000>;
108 };
109
110 opp-1001000000 {
111 opp-hz = /bits/ 64 <1001000000>;
112 opp-microvolt = <983000>;
113 };
114
115 opp-1105000000 {
116 opp-hz = /bits/ 64 <1105000000>;
117 opp-microvolt = <1009000>;
118 };
119
120 opp-1183000000 {
121 opp-hz = /bits/ 64 <1183000000>;
122 opp-microvolt = <1028000>;
123 };
124
125 opp-1404000000 {
126 opp-hz = /bits/ 64 <1404000000>;
127 opp-microvolt = <1083000>;
128 };
129
130 opp-1508000000 {
131 opp-hz = /bits/ 64 <1508000000>;
132 opp-microvolt = <1109000>;
133 };
134
135 opp-1573000000 {
136 opp-hz = /bits/ 64 <1573000000>;
137 opp-microvolt = <1125000>;
138 };
139 };
140
141 cpu_opp_table_b: opp_table_b {
142 compatible = "operating-points-v2";
143 opp-shared;
144
145 opp-507000000 {
146 opp-hz = /bits/ 64 <507000000>;
147 opp-microvolt = <828000>;
148 };
149
150 opp-702000000 {
151 opp-hz = /bits/ 64 <702000000>;
152 opp-microvolt = <867000>;
153 };
154
155 opp-1001000000 {
156 opp-hz = /bits/ 64 <1001000000>;
157 opp-microvolt = <927000>;
158 };
159
160 opp-1209000000 {
161 opp-hz = /bits/ 64 <1209000000>;
162 opp-microvolt = <968000>;
163 };
164
165 opp-1404000000 {
166 opp-hz = /bits/ 64 <1007000000>;
167 opp-microvolt = <1028000>;
168 };
169
170 opp-1612000000 {
171 opp-hz = /bits/ 64 <1612000000>;
172 opp-microvolt = <1049000>;
173 };
174
175 opp-1807000000 {
176 opp-hz = /bits/ 64 <1807000000>;
177 opp-microvolt = <1089000>;
178 };
179
180 opp-1989000000 {
181 opp-hz = /bits/ 64 <1989000000>;
182 opp-microvolt = <1125000>;
183 };
184 };
185
186 cpu0: cpu@0 {
187 device_type = "cpu";
188 compatible = "arm,cortex-a53";
189 reg = <0x000>;
190 enable-method = "psci";
191 cpu-idle-states = <&CPU_SLEEP_0>;
192 clocks = <&infracfg CLK_INFRA_CA53SEL>,
193 <&apmixedsys CLK_APMIXED_MAINPLL>;
194 clock-names = "cpu", "intermediate";
195 operating-points-v2 = <&cpu_opp_table_a>;
196 };
197
198 cpu1: cpu@1 {
199 device_type = "cpu";
200 compatible = "arm,cortex-a53";
201 reg = <0x001>;
202 enable-method = "psci";
203 cpu-idle-states = <&CPU_SLEEP_0>;
204 clocks = <&infracfg CLK_INFRA_CA53SEL>,
205 <&apmixedsys CLK_APMIXED_MAINPLL>;
206 clock-names = "cpu", "intermediate";
207 operating-points-v2 = <&cpu_opp_table_a>;
208 };
209
210 cpu2: cpu@100 {
211 device_type = "cpu";
212 compatible = "arm,cortex-a72";
213 reg = <0x100>;
214 enable-method = "psci";
215 cpu-idle-states = <&CPU_SLEEP_0>;
216 clocks = <&infracfg CLK_INFRA_CA72SEL>,
217 <&apmixedsys CLK_APMIXED_MAINPLL>;
218 clock-names = "cpu", "intermediate";
219 operating-points-v2 = <&cpu_opp_table_b>;
220 };
221
222 cpu3: cpu@101 {
223 device_type = "cpu";
224 compatible = "arm,cortex-a72";
225 reg = <0x101>;
226 enable-method = "psci";
227 cpu-idle-states = <&CPU_SLEEP_0>;
228 clocks = <&infracfg CLK_INFRA_CA72SEL>,
229 <&apmixedsys CLK_APMIXED_MAINPLL>;
230 clock-names = "cpu", "intermediate";
231 operating-points-v2 = <&cpu_opp_table_b>;
232 };
233
234 &cpu0 {
235 proc-supply = <&mt6397_vpca15_reg>;
236 };
237
238 &cpu1 {
239 proc-supply = <&mt6397_vpca15_reg>;
240 };
241
242 &cpu2 {
243 proc-supply = <&da9211_vcpu_reg>;
244 sram-supply = <&mt6397_vsramca7_reg>;
245 };
246
247 &cpu3 {
248 proc-supply = <&da9211_vcpu_reg>;
249 sram-supply = <&mt6397_vsramca7_reg>;
250 };
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