FreeBSD/Linux Kernel Cross Reference
sys/contrib/device-tree/Bindings/regulator/lp872x.txt

     Binding for TI/National Semiconductor LP872x Driver
     
     Required properties:
       - compatible: "ti,lp8720" or "ti,lp8725"
       - reg: I2C slave address. 0x7d = LP8720, 0x7a = LP8725
     
     Optional properties:
       - ti,general-config: the value of LP872X_GENERAL_CFG register (u8)
         (LP8720)
        bit[2]: BUCK output voltage control by external DVS pin or register
                1 = external pin, 0 = bit7 of register 08h
        bit[1]: sleep control by external DVS pin or register
                1 = external pin, 0 = bit6 of register 08h
        bit[0]: time step unit(usec). 1 = 25, 0 = 50
    
        (LP8725)
        bit[7:6]: time step unit(usec). 00 = 32, 01 = 64, 10 = 128, 11 = 256
        bit[4]:   BUCK2 enable control. 1 = enable, 0 = disable
        bit[3]:   BUCK2 output voltage register address. 1 = 0Ah, 0 = 0Bh
        bit[2]:   BUCK1 output voltage control by external DVS pin or register
                  1 = register 08h, 0 = DVS
        bit[1]:   LDO sleep control. 1 = sleep mode, 0 = normal
        bit[0]:   BUCK1 enable control, 1 = enable, 0 = disable
    
        For more details, please see the datasheet.
    
      - ti,update-config: define it when LP872X_GENERAL_CFG register should be set
      - ti,dvs-gpio: GPIO specifier for external DVS pin control of LP872x devices.
      - ti,dvs-vsel: DVS selector. 0 = SEL_V1, 1 = SEL_V2.
      - ti,dvs-state: initial DVS pin state. 0 = DVS_LOW, 1 = DVS_HIGH.
      - enable-gpios: GPIO specifier for EN pin control of LP872x devices.
    
      Sub nodes for regulator_init_data
        LP8720 has maximum 6 nodes. (child name: ldo1 ~ 5 and buck)
        LP8725 has maximum 9 nodes. (child name: ldo1 ~ 5, lilo1,2 and buck1,2)
        For more details, please see the following binding document.
        (Documentation/devicetree/bindings/regulator/regulator.txt)
    
    Datasheet
      - LP8720: https://www.ti.com/lit/ds/symlink/lp8720.pdf
      - LP8725: https://www.ti.com/lit/ds/symlink/lp8725.pdf
    
    Example 1) LP8720
    
    lp8720@7d {
            compatible = "ti,lp8720";
            reg = <0x7d>;
    
            /* external DVS pin used, timestep is 25usec */
            ti,general-config = /bits/ 8 <0x03>;
            ti,update-config;
    
            /*
             * The dvs-gpio depends on the processor environment.
             * For example, following GPIO specifier means GPIO134 in OMAP4.
             */
            ti,dvs-gpio = <&gpio5 6 0>;
            ti,dvs-vsel = /bits/ 8 <1>;             /* SEL_V2 */
            ti,dvs-state = /bits/ 8 <1>;            /* DVS_HIGH */
    
            vaf: ldo1 {
                    regulator-min-microvolt = <1200000>;
                    regulator-max-microvolt = <3300000>;
            };
    
            vmmc: ldo2 {
                    regulator-min-microvolt = <1200000>;
                    regulator-max-microvolt = <3300000>;
            };
    
            vcam_io: ldo3 {
                    regulator-min-microvolt = <1200000>;
                    regulator-max-microvolt = <3300000>;
                    regulator-boot-on;
            };
    
            vcam_core: ldo4 {
                    regulator-min-microvolt = <800000>;
                    regulator-max-microvolt = <2850000>;
                    regulator-boot-on;
            };
    
            vcam: ldo5 {
                    regulator-min-microvolt = <1200000>;
                    regulator-max-microvolt = <3300000>;
            };
    
            vcc: buck {
                    regulator-name = "VBUCK";
                    regulator-min-microvolt = <800000>;
                    regulator-max-microvolt = <2300000>;
            };
    };
    
    Example 2) LP8725
    
    lp8725@7a {
            compatible = "ti,lp8725";
            reg = <0x7a>;
   
           /* Enable BUCK1,2, no DVS, normal LDO mode, timestep is 256usec */
           ti,general-config = /bits/ 8 <0xdd>;
           ti,update-config;
   
           vcam_io: ldo1 {
                   regulator-min-microvolt = <1200000>;
                   regulator-max-microvolt = <3300000>;
           };
   
           vcam_core: ldo2 {
                   regulator-min-microvolt = <1200000>;
                   regulator-max-microvolt = <3300000>;
           };
   
           vcam: ldo3 {
                   regulator-min-microvolt = <1200000>;
                   regulator-max-microvolt = <3300000>;
           };
   
           vcmmb_io: ldo4 {
                   regulator-min-microvolt = <1200000>;
                   regulator-max-microvolt = <3300000>;
                   regulator-boot-on;
           };
   
           vcmmb_core: ldo5 {
                   regulator-min-microvolt = <1200000>;
                   regulator-max-microvolt = <3300000>;
                   regulator-boot-on;
           };
   
           vaux1: lilo1 {
                   regulator-name = "VAUX1";
                   regulator-min-microvolt = <800000>;
                   regulator-max-microvolt = <3300000>;
           };
   
           vaux2: lilo2 {
                   regulator-name = "VAUX2";
                   regulator-min-microvolt = <800000>;
                   regulator-max-microvolt = <3300000>;
           };
   
           vcc1: buck1 {
                   regulator-name = "VBUCK1";
                   regulator-min-microvolt = <800000>;
                   regulator-max-microvolt = <3000000>;
                   regulator-min-microamp  = <460000>;
                   regulator-max-microamp  = <1370000>;
                   regulator-boot-on;
           };
   
           vcc2: buck2 {
                   regulator-name = "VBUCK2";
                   regulator-min-microvolt = <800000>;
                   regulator-max-microvolt = <3000000>;
                   regulator-min-microamp  = <460000>;
                   regulator-max-microamp  = <1370000>;
                   regulator-boot-on;
           };
   };

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