1*4882a593SmuzhiyunRockchip cpu avs device tree bindings 2*4882a593Smuzhiyun------------------------------------- 3*4882a593Smuzhiyun 4*4882a593SmuzhiyunUnder the same frequency, the operating voltage tends to decrease with 5*4882a593Smuzhiyunincreasing leakage. so it is necessary to adjust opp's voltage according 6*4882a593Smuzhiyunto leakage for power. 7*4882a593Smuzhiyun 8*4882a593Smuzhiyun 9*4882a593SmuzhiyunRequired properties: 10*4882a593Smuzhiyun- cluster-id: At runtime, the platform can find a cpu's cluster_id 11*4882a593Smuzhiyun according to it's cpu_id and match cluster-id property. 12*4882a593Smuzhiyun- min-volt: The minimum voltage in uV. Even though opp's voltage will be 13*4882a593Smuzhiyun adjusted, it must be bigger than or equal to the minimum. 14*4882a593Smuzhiyun- min-freq: The minimum frequency in KHz. If an opp's frequency is bigger 15*4882a593Smuzhiyun than or equal to the minimum, its volatge will be adjusted. 16*4882a593Smuzhiyun- leakage-adjust-volt: The property is an array of 3-tuples items, and 17*4882a593Smuzhiyun each item consists of leakage and voltage like 18*4882a593Smuzhiyun <min-leakage-mA max-leakage-mA volt-uV>. 19*4882a593Smuzhiyun min-leakage: minimum leakage in mA, ranges from 0 to 254. 20*4882a593Smuzhiyun max-leakage: maximum leakage in mA, ranges from 0 to 254. 21*4882a593Smuzhiyun volt: voltage offset in uV to apply to the opp table entries. 22*4882a593Smuzhiyun- nvmem-cells: A phandle to the leakage data provided by efuse. 23*4882a593Smuzhiyun- nvmem-cell-names: Should be "cpu_leakage". 24*4882a593Smuzhiyun 25*4882a593SmuzhiyunExample: 26*4882a593Smuzhiyun 27*4882a593Smuzhiyun cpu_avs: cpu-avs { 28*4882a593Smuzhiyun cluster0-avs { 29*4882a593Smuzhiyun cluster-id = <0>; 30*4882a593Smuzhiyun min-volt = <800000>; /* uV */ 31*4882a593Smuzhiyun min-freq = <408000>; /* KHz */ 32*4882a593Smuzhiyun leakage-adjust-volt = < 33*4882a593Smuzhiyun /* mA mA uV */ 34*4882a593Smuzhiyun 0 254 0 35*4882a593Smuzhiyun >; 36*4882a593Smuzhiyun nvmem-cells = <&cpul_leakage>; 37*4882a593Smuzhiyun nvmem-cell-names = "cpu_leakage"; 38*4882a593Smuzhiyun }; 39*4882a593Smuzhiyun cluster1-avs { 40*4882a593Smuzhiyun cluster-id = <1>; 41*4882a593Smuzhiyun min-volt = <800000>; /* uV */ 42*4882a593Smuzhiyun min-freq = <408000>; /* KHz */ 43*4882a593Smuzhiyun leakage-adjust-volt = < 44*4882a593Smuzhiyun /* mA mA uV */ 45*4882a593Smuzhiyun 0 254 0 46*4882a593Smuzhiyun >; 47*4882a593Smuzhiyun nvmem-cells = <&cpub_leakage>; 48*4882a593Smuzhiyun nvmem-cell-names = "cpu_leakage"; 49*4882a593Smuzhiyun }; 50*4882a593Smuzhiyun }; 51