128 lines
3.8 KiB
Plaintext
Executable file
128 lines
3.8 KiB
Plaintext
Executable file
Pincontrol driver for MAX77620 Power management IC from Maxim Semiconductor.
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Device has 8 GPIO pins which can be configured as GPIO as well as the
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special IO functions.
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Please refer file <devicetree/bindings/pinctrl/pinctrl-bindings.txt>
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for details of the common pinctrl bindings used by client devices,
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including the meaning of the phrase "pin configuration node".
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Optional Pinmux properties:
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--------------------------
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Following properties are required if default setting of pins are required
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at boot.
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- pinctrl-names: A pinctrl state named per <pinctrl-bindings.txt>.
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- pinctrl[0...n]: Properties to contain the phandle for pinctrl states per
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<pinctrl-bindings.txt>.
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The pin configurations are defined as child of the pinctrl states node. Each
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sub-node have following properties:
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Required properties:
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------------------
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- pins: List of pins. Valid values of pins properties are:
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gpio0, gpio1, gpio2, gpio3, gpio4, gpio5, gpio6, gpio7.
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Optional properties:
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-------------------
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Following are optional properties defined as pinmux DT binding document
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<pinctrl-bindings.txt>. Absence of properties will leave the configuration
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on default.
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function,
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drive-push-pull,
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drive-open-drain,
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bias-pull-up,
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bias-pull-down.
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Valid values for function properties are:
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gpio, lpm-control-in, fps-out, 32k-out, sd0-dvs-in, sd1-dvs-in,
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reference-out
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Theres is also customised properties for the GPIO1, GPIO2 and GPIO3. These
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customised properties are required to configure FPS configuration parameters
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of these GPIOs. Please refer <devicetree/bindings/mfd/max77620.txt> for more
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detail of Flexible Power Sequence (FPS).
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- maxim,active-fps-source: FPS source for the GPIOs to get
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enabled/disabled when system is in
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active state. Valid values are:
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- MAX77620_FPS_SRC_0,
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FPS source is FPS0.
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- MAX77620_FPS_SRC_1,
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FPS source is FPS1
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- MAX77620_FPS_SRC_2 and
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FPS source is FPS2
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- MAX77620_FPS_SRC_NONE.
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GPIO is not controlled
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by FPS events and it gets
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enabled/disabled by register
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access.
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Absence of this property will leave
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the FPS configuration register for that
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GPIO to default configuration.
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- maxim,active-fps-power-up-slot: Sequencing event slot number on which
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the GPIO get enabled when
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master FPS input event set to HIGH.
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Valid values are 0 to 7.
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This is applicable if FPS source is
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selected as FPS0, FPS1 or FPS2.
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- maxim,active-fps-power-down-slot: Sequencing event slot number on which
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the GPIO get disabled when master
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FPS input event set to LOW.
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Valid values are 0 to 7.
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This is applicable if FPS source is
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selected as FPS0, FPS1 or FPS2.
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- maxim,suspend-fps-source: This is same as property
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"maxim,active-fps-source" but value
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get configured when system enters in
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to suspend state.
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- maxim,suspend-fps-power-up-slot: This is same as property
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"maxim,active-fps-power-up-slot" but
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this value get configured into FPS
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configuration register when system
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enters into suspend.
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This is applicable if suspend state
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FPS source is selected as FPS0, FPS1 or
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- maxim,suspend-fps-power-down-slot: This is same as property
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"maxim,active-fps-power-down-slot" but
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this value get configured into FPS
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configuration register when system
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enters into suspend.
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This is applicable if suspend state
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FPS source is selected as FPS0, FPS1 or
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FPS2.
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Example:
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--------
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#include <dt-bindings/mfd/max77620.h>
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...
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max77620@3c {
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pinctrl-names = "default";
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pinctrl-0 = <&spmic_default>;
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spmic_default: pinmux@0 {
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pin_gpio0 {
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pins = "gpio0";
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function = "gpio";
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};
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pin_gpio1 {
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pins = "gpio1";
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function = "fps-out";
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maxim,active-fps-source = <MAX77620_FPS_SRC_0>;
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};
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pin_gpio2 {
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pins = "gpio2";
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function = "fps-out";
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maxim,active-fps-source = <MAX77620_FPS_SRC_1>;
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};
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};
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};
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