215 lines
6.6 KiB
Plaintext
215 lines
6.6 KiB
Plaintext
* ams AS3722 Power management IC.
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Required properties:
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-------------------
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- compatible: Must be "ams,as3722".
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- reg: I2C device address.
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- interrupt-controller: AS3722 has internal interrupt controller which takes the
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interrupt request from internal sub-blocks like RTC, regulators, GPIOs as well
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as external input.
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- #interrupt-cells: Should be set to 2 for IRQ number and flags.
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The first cell is the IRQ number. IRQ numbers for different interrupt source
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of AS3722 are defined at dt-bindings/mfd/as3722.h
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The second cell is the flags, encoded as the trigger masks from binding document
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interrupts.txt, using dt-bindings/irq.
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Optional properties:
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--------------------
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- ams,enable-internal-int-pullup: Boolean property, to enable internal pullup on
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interrupt pin. Missing this will disable internal pullup on INT pin.
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- ams,enable-internal-i2c-pullup: Boolean property, to enable internal pullup on
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i2c scl/sda pins. Missing this will disable internal pullup on i2c
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scl/sda lines.
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- ams,enable-ac-ok-power-on: Boolean property, to enable exit out of power off
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mode with AC_OK pin (pin enabled in power off mode).
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Optional submodule and their properties:
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=======================================
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Pinmux and GPIO:
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===============
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Device has 8 GPIO pins which can be configured as GPIO as well as the special IO
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functions.
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Please refer to pinctrl-bindings.txt in this directory for details of the
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common pinctrl bindings used by client devices, including the meaning of the
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phrase "pin configuration node".
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Following are properties which is needed if GPIO and pinmux functionality
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is required:
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Required properties:
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-------------------
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- gpio-controller: Marks the device node as a GPIO controller.
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- #gpio-cells: Number of GPIO cells. Refer to binding document
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gpio/gpio.txt
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Optional properties:
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--------------------
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Following properties are require if pin control setting is required
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at boot.
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- pinctrl-names: A pinctrl state named "default" be defined, using the
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bindings in pinctrl/pinctrl-bindings.txt.
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- pinctrl[0...n]: Properties to contain the phandle that refer to
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different nodes of pin control settings. These nodes represents
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the pin control setting of state 0 to state n. Each of these
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nodes contains different subnodes to represents some desired
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configuration for a list of pins. This configuration can
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include the mux function to select on those pin(s), and
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various pin configuration parameters, such as pull-up,
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open drain.
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Each subnode have following properties:
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Required properties:
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- pins: List of pins. Valid values of pins properties are:
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gpio0, gpio1, gpio2, gpio3, gpio4, gpio5,
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gpio6, gpio7
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Optional properties:
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function, bias-disable, bias-pull-up, bias-pull-down,
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bias-high-impedance, drive-open-drain.
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Valid values for function properties are:
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gpio, interrupt-out, gpio-in-interrupt,
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vsup-vbat-low-undebounce-out,
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vsup-vbat-low-debounce-out,
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voltage-in-standby, oc-pg-sd0, oc-pg-sd6,
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powergood-out, pwm-in, pwm-out, clk32k-out,
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watchdog-in, soft-reset-in
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Regulators:
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===========
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Device has multiple DCDC and LDOs. The node "regulators" is require if regulator
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functionality is needed.
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Following are properties of regulator subnode.
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Optional properties:
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-------------------
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The input supply of regulators are the optional properties on the
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regulator node. The input supply of these regulators are provided
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through following properties:
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vsup-sd2-supply: Input supply for SD2.
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vsup-sd3-supply: Input supply for SD3.
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vsup-sd4-supply: Input supply for SD4.
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vsup-sd5-supply: Input supply for SD5.
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vin-ldo0-supply: Input supply for LDO0.
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vin-ldo1-6-supply: Input supply for LDO1 and LDO6.
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vin-ldo2-5-7-supply: Input supply for LDO2, LDO5 and LDO7.
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vin-ldo3-4-supply: Input supply for LDO3 and LDO4.
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vin-ldo9-10-supply: Input supply for LDO9 and LDO10.
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vin-ldo11-supply: Input supply for LDO11.
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Optional sub nodes for regulators:
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---------------------------------
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The subnodes name is the name of regulator and it must be one of:
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sd[0-6], ldo[0-7], ldo[9-11]
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Each sub-node should contain the constraints and initialization
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information for that regulator. See regulator.txt for a description
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of standard properties for these sub-nodes.
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Additional optional custom properties are listed below.
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ams,ext-control: External control of the rail. The option of
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this properties will tell which external input is
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controlling this rail. Valid values are 0, 1, 2 ad 3.
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0: There is no external control of this rail.
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1: Rail is controlled by ENABLE1 input pin.
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2: Rail is controlled by ENABLE2 input pin.
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3: Rail is controlled by ENABLE3 input pin.
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Missing this property on DT will be assume as no
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external control. The external control pin macros
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are defined @dt-bindings/mfd/as3722.h
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ams,enable-tracking: Enable tracking with SD1, only supported
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by LDO3.
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Power-off:
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=========
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AS3722 supports the system power off by turning off all its rails.
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The device node should have the following properties to enable this
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functionality
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ams,system-power-controller: Boolean, to enable the power off functionality
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through this device.
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Example:
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--------
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#include <dt-bindings/mfd/as3722.h>
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...
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ams3722 {
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compatible = "ams,as3722";
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reg = <0x48>;
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ams,system-power-controller;
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interrupt-parent = <&intc>;
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interrupt-controller;
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#interrupt-cells = <2>;
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gpio-controller;
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#gpio-cells = <2>;
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pinctrl-names = "default";
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pinctrl-0 = <&as3722_default>;
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as3722_default: pinmux {
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gpio0 {
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pins = "gpio0";
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function = "gpio";
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bias-pull-down;
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};
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gpio1_2_4_7 {
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pins = "gpio1", "gpio2", "gpio4", "gpio7";
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function = "gpio";
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bias-pull-up;
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};
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gpio5 {
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pins = "gpio5";
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function = "clk32k_out";
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};
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}
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regulators {
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vsup-sd2-supply = <...>;
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...
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sd0 {
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regulator-name = "vdd_cpu";
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regulator-min-microvolt = <700000>;
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regulator-max-microvolt = <1400000>;
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regulator-always-on;
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ams,ext-control = <2>;
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};
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sd1 {
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regulator-name = "vdd_core";
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regulator-min-microvolt = <700000>;
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regulator-max-microvolt = <1400000>;
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regulator-always-on;
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ams,ext-control = <1>;
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};
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sd2 {
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regulator-name = "vddio_ddr";
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regulator-min-microvolt = <1350000>;
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regulator-max-microvolt = <1350000>;
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regulator-always-on;
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};
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sd4 {
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regulator-name = "avdd-hdmi-pex";
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regulator-min-microvolt = <1050000>;
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regulator-max-microvolt = <1050000>;
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regulator-always-on;
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};
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sd5 {
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regulator-name = "vdd-1v8";
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regulator-min-microvolt = <1800000>;
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regulator-max-microvolt = <1800000>;
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regulator-always-on;
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};
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....
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};
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};
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