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Diffstat (limited to 'kernel/Documentation/devicetree/bindings/mfd/axp20x.txt')
| -rw-r--r-- | kernel/Documentation/devicetree/bindings/mfd/axp20x.txt | 96 |
1 files changed, 96 insertions, 0 deletions
diff --git a/kernel/Documentation/devicetree/bindings/mfd/axp20x.txt b/kernel/Documentation/devicetree/bindings/mfd/axp20x.txt new file mode 100644 index 000000000..98685f291 --- /dev/null +++ b/kernel/Documentation/devicetree/bindings/mfd/axp20x.txt @@ -0,0 +1,96 @@ +AXP202/AXP209 device tree bindings + +The axp20x family current members : +axp202 (X-Powers) +axp209 (X-Powers) + +Required properties: +- compatible: "x-powers,axp202" or "x-powers,axp209" +- reg: The I2C slave address for the AXP chip +- interrupt-parent: The parent interrupt controller +- interrupts: SoC NMI / GPIO interrupt connected to the PMIC's IRQ pin +- interrupt-controller: axp20x has its own internal IRQs +- #interrupt-cells: Should be set to 1 + +Optional properties: +- x-powers,dcdc-freq: defines the work frequency of DC-DC in KHz + (range: 750-1875). Default: 1.5MHz +- <input>-supply: a phandle to the regulator supply node. May be omitted if + inputs are unregulated, such as using the IPSOUT output + from the PMIC. + +- regulators: A node that houses a sub-node for each regulator. Regulators + not used but preferred to be managed by the OS should be + listed as well. + See Documentation/devicetree/bindings/regulator/regulator.txt + for more information on standard regulator bindings. + +Optional properties for DCDC regulators: +- x-powers,dcdc-workmode: 1 for PWM mode, 0 for AUTO (PWM/PFM) mode + Default: Current hardware setting + The DCDC regulators work in a mixed PWM/PFM mode, + using PFM under light loads and switching to PWM + for heavier loads. Forcing PWM mode trades efficiency + under light loads for lower output noise. This + probably makes sense for HiFi audio related + applications that aren't battery constrained. + + +AXP202/AXP209 regulators, type, and corresponding input supply names: + +Regulator Type Supply Name Notes +--------- ---- ----------- ----- +DCDC2 : DC-DC buck : vin2-supply +DCDC3 : DC-DC buck : vin3-supply +LDO1 : LDO : acin-supply : always on +LDO2 : LDO : ldo24in-supply : shared supply +LDO3 : LDO : ldo3in-supply +LDO4 : LDO : ldo24in-supply : shared supply +LDO5 : LDO : ldo5in-supply + +Example: + +axp209: pmic@34 { + compatible = "x-powers,axp209"; + reg = <0x34>; + interrupt-parent = <&nmi_intc>; + interrupts = <0 IRQ_TYPE_LEVEL_LOW>; + interrupt-controller; + #interrupt-cells = <1>; + + regulators { + x-powers,dcdc-freq = <1500>; + + vdd_cpu: dcdc2 { + regulator-always-on; + regulator-min-microvolt = <1000000>; + regulator-max-microvolt = <1450000>; + regulator-name = "vdd-cpu"; + }; + + vdd_int_dll: dcdc3 { + regulator-always-on; + regulator-min-microvolt = <1000000>; + regulator-max-microvolt = <1400000>; + regulator-name = "vdd-int-dll"; + }; + + vdd_rtc: ldo1 { + regulator-always-on; + regulator-min-microvolt = <1200000>; + regulator-max-microvolt = <1400000>; + regulator-name = "vdd-rtc"; + }; + + avcc: ldo2 { + regulator-always-on; + regulator-min-microvolt = <2700000>; + regulator-max-microvolt = <3300000>; + regulator-name = "avcc"; + }; + + ldo3 { + /* unused but preferred to be managed by OS */ + }; + }; +}; |