1 Binding for ST's CPUFreq driver 1 Binding for ST's CPUFreq driver
2 =============================== 2 ===============================
3 3
4 ST's CPUFreq driver attempts to read 'process' 4 ST's CPUFreq driver attempts to read 'process' and 'version' attributes
5 from the SoC, then supplies the OPP framework 5 from the SoC, then supplies the OPP framework with 'prop' and 'supported
6 hardware' information respectively. The frame 6 hardware' information respectively. The framework is then able to read
7 the DT and operate in the usual way. 7 the DT and operate in the usual way.
8 8
9 Frequency Scaling only 9 Frequency Scaling only
10 ---------------------- 10 ----------------------
11 11
12 No vendor specific driver required for this. 12 No vendor specific driver required for this.
13 13
14 Located in CPU's node: 14 Located in CPU's node:
15 15
16 - operating-points : [See: ../pow 16 - operating-points : [See: ../power/opp-v1.yaml]
17 17
18 Example [safe] 18 Example [safe]
19 -------------- 19 --------------
20 20
21 cpus { 21 cpus {
22 cpu@0 { 22 cpu@0 {
23 /* kHz uV 23 /* kHz uV */
24 operating-points = <1500000 0 24 operating-points = <1500000 0
25 1200000 0 25 1200000 0
26 800000 0 26 800000 0
27 500000 0> 27 500000 0>;
28 }; 28 };
29 }; 29 };
30 30
31 Dynamic Voltage and Frequency Scaling (DVFS) 31 Dynamic Voltage and Frequency Scaling (DVFS)
32 -------------------------------------------- 32 --------------------------------------------
33 33
34 This requires the ST CPUFreq driver to supply 34 This requires the ST CPUFreq driver to supply 'process' and 'version' info.
35 35
36 Located in CPU's node: 36 Located in CPU's node:
37 37
38 - operating-points-v2 : [See ../powe 38 - operating-points-v2 : [See ../power/opp-v2.yaml]
39 39
40 Example [unsafe] 40 Example [unsafe]
41 ---------------- 41 ----------------
42 42
43 cpus { 43 cpus {
44 cpu@0 { 44 cpu@0 {
45 operating-points-v2 = <&cp 45 operating-points-v2 = <&cpu0_opp_table>;
46 }; 46 };
47 }; 47 };
48 48
49 cpu0_opp_table: opp_table { 49 cpu0_opp_table: opp_table {
50 compatible = "operating-points-v2"; 50 compatible = "operating-points-v2";
51 51
52 /* ################################### 52 /* ############################################################### */
53 /* # WARNING: Do not attempt to copy/r 53 /* # WARNING: Do not attempt to copy/replicate these nodes, # */
54 /* # they are only to be supp 54 /* # they are only to be supplied by the bootloader !!! # */
55 /* ################################### 55 /* ############################################################### */
56 opp0 { 56 opp0 {
57 /* Maj 57 /* Major Minor Substrate */
58 /* 2 58 /* 2 all all */
59 opp-supported-hw = <0x0 59 opp-supported-hw = <0x00000004 0xffffffff 0xffffffff>;
60 opp-hz = /bit 60 opp-hz = /bits/ 64 <1500000000>;
61 clock-latency-ns = <100 61 clock-latency-ns = <10000000>;
62 62
63 opp-microvolt-pcode0 = <120 63 opp-microvolt-pcode0 = <1200000>;
64 opp-microvolt-pcode1 = <120 64 opp-microvolt-pcode1 = <1200000>;
65 opp-microvolt-pcode2 = <120 65 opp-microvolt-pcode2 = <1200000>;
66 opp-microvolt-pcode3 = <120 66 opp-microvolt-pcode3 = <1200000>;
67 opp-microvolt-pcode4 = <117 67 opp-microvolt-pcode4 = <1170000>;
68 opp-microvolt-pcode5 = <114 68 opp-microvolt-pcode5 = <1140000>;
69 opp-microvolt-pcode6 = <110 69 opp-microvolt-pcode6 = <1100000>;
70 opp-microvolt-pcode7 = <107 70 opp-microvolt-pcode7 = <1070000>;
71 }; 71 };
72 72
73 opp1 { 73 opp1 {
74 /* Maj 74 /* Major Minor Substrate */
75 /* all 75 /* all all all */
76 opp-supported-hw = <0xf 76 opp-supported-hw = <0xffffffff 0xffffffff 0xffffffff>;
77 opp-hz = /bit 77 opp-hz = /bits/ 64 <1200000000>;
78 clock-latency-ns = <100 78 clock-latency-ns = <10000000>;
79 79
80 opp-microvolt-pcode0 = <111 80 opp-microvolt-pcode0 = <1110000>;
81 opp-microvolt-pcode1 = <115 81 opp-microvolt-pcode1 = <1150000>;
82 opp-microvolt-pcode2 = <110 82 opp-microvolt-pcode2 = <1100000>;
83 opp-microvolt-pcode3 = <108 83 opp-microvolt-pcode3 = <1080000>;
84 opp-microvolt-pcode4 = <104 84 opp-microvolt-pcode4 = <1040000>;
85 opp-microvolt-pcode5 = <102 85 opp-microvolt-pcode5 = <1020000>;
86 opp-microvolt-pcode6 = <980 86 opp-microvolt-pcode6 = <980000>;
87 opp-microvolt-pcode7 = <930 87 opp-microvolt-pcode7 = <930000>;
88 }; 88 };
89 }; 89 };
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