Kernel-4.18.0-80.el8_lp872x

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: http://www.ti.com/lit/ds/symlink/lp8720.pdf
• LP8725: http://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;
};

};