forked from Minki/linux
cf1d54394d
Bindings documentation for the AXP20x driver. In this file also sub-nodes are documented. Signed-off-by: Carlo Caione <carlo@caione.org> [wens@csie.org: clarify interrupt source for the axp PMIC] [wens@csie.org: explain dcdc-workmode in detail and trim lines to 80 chars] [wens@csie.org: make regulator supplies optional if using unregulated input] [wens@csie.org: use cubieboard2 regulator nodes as example] [wens@csie.org: x-powers,dcdc-workmode default changed to 'current hardware setting'] [wens@csie.org: reorganized regulator related properties into separate section.] Signed-off-by: Chen-Yu Tsai <wens@csie.org> Acked-by: Maxime Ripard <maxime.ripard@free-electrons.com> Signed-off-by: Lee Jones <lee.jones@linaro.org>
97 lines
2.8 KiB
Plaintext
97 lines
2.8 KiB
Plaintext
AXP202/AXP209 device tree bindings
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The axp20x family current members :
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axp202 (X-Powers)
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axp209 (X-Powers)
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Required properties:
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- compatible: "x-powers,axp202" or "x-powers,axp209"
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- reg: The I2C slave address for the AXP chip
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- interrupt-parent: The parent interrupt controller
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- interrupts: SoC NMI / GPIO interrupt connected to the PMIC's IRQ pin
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- interrupt-controller: axp20x has its own internal IRQs
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- #interrupt-cells: Should be set to 1
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Optional properties:
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- x-powers,dcdc-freq: defines the work frequency of DC-DC in KHz
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(range: 750-1875). Default: 1.5MHz
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- <input>-supply: a phandle to the regulator supply node. May be omitted if
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inputs are unregulated, such as using the IPSOUT output
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from the PMIC.
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- regulators: A node that houses a sub-node for each regulator. Regulators
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not used but preferred to be managed by the OS should be
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listed as well.
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See Documentation/devicetree/bindings/regulator/regulator.txt
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for more information on standard regulator bindings.
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Optional properties for DCDC regulators:
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- x-powers,dcdc-workmode: 1 for PWM mode, 0 for AUTO (PWM/PFM) mode
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Default: Current hardware setting
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The DCDC regulators work in a mixed PWM/PFM mode,
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using PFM under light loads and switching to PWM
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for heavier loads. Forcing PWM mode trades efficiency
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under light loads for lower output noise. This
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probably makes sense for HiFi audio related
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applications that aren't battery constrained.
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AXP202/AXP209 regulators, type, and corresponding input supply names:
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Regulator Type Supply Name Notes
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--------- ---- ----------- -----
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DCDC2 : DC-DC buck : vin2-supply
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DCDC3 : DC-DC buck : vin3-supply
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LDO1 : LDO : acin-supply : always on
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LDO2 : LDO : ldo24in-supply : shared supply
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LDO3 : LDO : ldo3in-supply
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LDO4 : LDO : ldo24in-supply : shared supply
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LDO5 : LDO : ldo5in-supply
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Example:
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axp209: pmic@34 {
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compatible = "x-powers,axp209";
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reg = <0x34>;
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interrupt-parent = <&nmi_intc>;
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interrupts = <0 IRQ_TYPE_LEVEL_LOW>;
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interrupt-controller;
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#interrupt-cells = <1>;
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regulators {
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x-powers,dcdc-freq = <1500>;
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vdd_cpu: dcdc2 {
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regulator-always-on;
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regulator-min-microvolt = <1000000>;
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regulator-max-microvolt = <1450000>;
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regulator-name = "vdd-cpu";
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};
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vdd_int_dll: dcdc3 {
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regulator-always-on;
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regulator-min-microvolt = <1000000>;
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regulator-max-microvolt = <1400000>;
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regulator-name = "vdd-int-dll";
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};
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vdd_rtc: ldo1 {
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regulator-always-on;
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regulator-min-microvolt = <1200000>;
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regulator-max-microvolt = <1400000>;
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regulator-name = "vdd-rtc";
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};
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avcc: ldo2 {
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regulator-always-on;
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regulator-min-microvolt = <2700000>;
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regulator-max-microvolt = <3300000>;
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regulator-name = "avcc";
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};
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ldo3 {
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/* unused but preferred to be managed by OS */
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};
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};
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};
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