1Texas Instruments OMAP compatible OPP supply description 2 3OMAP5, DRA7, and AM57 family of SoCs have Class0 AVS eFuse registers which 4contain data that can be used to adjust voltages programmed for some of their 5supplies for more efficient operation. This binding provides the information 6needed to read these values and use them to program the main regulator during 7an OPP transitions. 8 9Also, some supplies may have an associated vbb-supply which is an Adaptive Body 10Bias regulator which much be transitioned in a specific sequence with regards 11to the vdd-supply and clk when making an OPP transition. By supplying two 12regulators to the device that will undergo OPP transitions we can make use 13of the multi regulator binding that is part of the OPP core described here [1] 14to describe both regulators needed by the platform. 15 16[1] Documentation/devicetree/bindings/opp/opp-v2.yaml 17 18Required Properties for Device Node: 19- vdd-supply: phandle to regulator controlling VDD supply 20- vbb-supply: phandle to regulator controlling Body Bias supply 21 (Usually Adaptive Body Bias regulator) 22 23Required Properties for opp-supply node: 24- compatible: Should be one of: 25 "ti,omap-opp-supply" - basic OPP supply controlling VDD and VBB 26 "ti,omap5-opp-supply" - OMAP5+ optimized voltages in efuse(class0)VDD 27 along with VBB 28 "ti,omap5-core-opp-supply" - OMAP5+ optimized voltages in efuse(class0) VDD 29 but no VBB. 30- reg: Address and length of the efuse register set for the device (mandatory 31 only for "ti,omap5-opp-supply") 32- ti,efuse-settings: An array of u32 tuple items providing information about 33 optimized efuse configuration. Each item consists of the following: 34 volt: voltage in uV - reference voltage (OPP voltage) 35 efuse_offseet: efuse offset from reg where the optimized voltage is stored. 36- ti,absolute-max-voltage-uv: absolute maximum voltage for the OPP supply. 37 38Example: 39 40/* Device Node (CPU) */ 41cpus { 42 cpu0: cpu@0 { 43 device_type = "cpu"; 44 45 ... 46 47 vdd-supply = <&vcc>; 48 vbb-supply = <&abb_mpu>; 49 }; 50}; 51 52/* OMAP OPP Supply with Class0 registers */ 53opp_supply_mpu: opp_supply@4a003b20 { 54 compatible = "ti,omap5-opp-supply"; 55 reg = <0x4a003b20 0x8>; 56 ti,efuse-settings = < 57 /* uV offset */ 58 1060000 0x0 59 1160000 0x4 60 1210000 0x8 61 >; 62 ti,absolute-max-voltage-uv = <1500000>; 63}; 64