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