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;
};
};