Qualcomm PMIC GPIO block
This binding describes the GPIO block(s) found in the 8xxx series of
PMIC's from Qualcomm.
- compatible:
Usage: required
Value type: <string>
Definition: must be one of:
"qcom,pm8018-gpio"
"qcom,pm8038-gpio"
"qcom,pm8058-gpio"
"qcom,pm8916-gpio"
"qcom,pm8917-gpio"
"qcom,pm8921-gpio"
"qcom,pm8941-gpio"
"qcom,pma8084-gpio"
- reg:
Usage: required
Value type: <prop-encoded-array>
Definition: Register base of the GPIO block and length.
- interrupts:
Usage: required
Value type: <prop-encoded-array>
Definition: Must contain an array of encoded interrupt specifiers for
each available GPIO
- gpio-controller:
Usage: required
Value type: <none>
Definition: Mark the device node as a GPIO controller
- #gpio-cells:
Usage: required
Value type: <u32>
Definition: Must be 2;
the first cell will be used to define gpio number and the
second denotes the flags for this gpio
Please refer to ../gpio/gpio.txt and ../interrupt-controller/interrupts.txt for
a general description of GPIO and interrupt bindings.
Please refer to pinctrl-bindings.txt in this directory for details of the
common pinctrl bindings used by client devices, including the meaning of the
phrase "pin configuration node".
The pin configuration nodes act as a container for an arbitrary number of
subnodes. Each of these subnodes represents some desired configuration for a
pin or a list of pins. This configuration can include the
mux function to select on those pin(s), and various pin configuration
parameters, as listed below.
SUBNODES:
The name of each subnode is not important; all subnodes should be enumerated
and processed purely based on their content.
Each subnode only affects those parameters that are explicitly listed. In
other words, a subnode that lists a mux function but no pin configuration
parameters implies no information about any pin configuration parameters.
Similarly, a pin subnode that describes a pullup parameter implies no
information about e.g. the mux function.
The following generic properties as defined in pinctrl-bindings.txt are valid
to specify in a pin configuration subnode:
- pins:
Usage: required
Value type: <string-array>
Definition: List of gpio pins affected by the properties specified in
this subnode. Valid pins are:
gpio1-gpio6 for pm8018
gpio1-gpio12 for pm8038
gpio1-gpio40 for pm8058
gpio1-gpio4 for pm8916
gpio1-gpio38 for pm8917
gpio1-gpio44 for pm8921
gpio1-gpio36 for pm8941
gpio1-gpio22 for pma8084
- function:
Usage: required
Value type: <string>
Definition: Specify the alternative function to be configured for the
specified pins. Valid values are:
"normal",
"paired",
"func1",
"func2",
"dtest1",
"dtest2",
"dtest3",
"dtest4"
- bias-disable:
Usage: optional
Value type: <none>
Definition: The specified pins should be configured as no pull.
- bias-pull-down:
Usage: optional
Value type: <none>
Definition: The specified pins should be configured as pull down.
- bias-pull-up:
Usage: optional
Value type: <empty>
Definition: The specified pins should be configured as pull up.
- qcom,pull-up-strength:
Usage: optional
Value type: <u32>
Definition: Specifies the strength to use for pull up, if selected.
Valid values are; as defined in
<dt-bindings/pinctrl/qcom,pmic-gpio.h>:
1: 30uA (PMIC_GPIO_PULL_UP_30)
2: 1.5uA (PMIC_GPIO_PULL_UP_1P5)
3: 31.5uA (PMIC_GPIO_PULL_UP_31P5)
4: 1.5uA + 30uA boost (PMIC_GPIO_PULL_UP_1P5_30)
If this property is ommited 30uA strength will be used if
pull up is selected
- bias-high-impedance:
Usage: optional
Value type: <none>
Definition: The specified pins will put in high-Z mode and disabled.
- input-enable:
Usage: optional
Value type: <none>
Definition: The specified pins are put in input mode.
- output-high:
Usage: optional
Value type: <none>
Definition: The specified pins are configured in output mode, driven
high.
- output-low:
Usage: optional
Value type: <none>
Definition: The specified pins are configured in output mode, driven
low.
- power-source:
Usage: optional
Value type: <u32>
Definition: Selects the power source for the specified pins. Valid
power sources are defined per chip in
<dt-bindings/pinctrl/qcom,pmic-gpio.h>
- qcom,drive-strength:
Usage: optional
Value type: <u32>
Definition: Selects the drive strength for the specified pins. Value
drive strengths are:
0: no (PMIC_GPIO_STRENGTH_NO)
1: high (PMIC_GPIO_STRENGTH_HIGH) 0.9mA @ 1.8V - 1.9mA @ 2.6V
2: medium (PMIC_GPIO_STRENGTH_MED) 0.6mA @ 1.8V - 1.25mA @ 2.6V
3: low (PMIC_GPIO_STRENGTH_LOW) 0.15mA @ 1.8V - 0.3mA @ 2.6V
as defined in <dt-bindings/pinctrl/qcom,pmic-gpio.h>
- drive-push-pull:
Usage: optional
Value type: <none>
Definition: The specified pins are configured in push-pull mode.
- drive-open-drain:
Usage: optional
Value type: <none>
Definition: The specified pins are configured in open-drain mode.
- drive-open-source:
Usage: optional
Value type: <none>
Definition: The specified pins are configured in open-source mode.
Example:
pm8921_gpio: gpio@150 {
compatible = "qcom,pm8921-gpio";
reg = <0x150 0x160>;
interrupts = <192 1>, <193 1>, <194 1>,
<195 1>, <196 1>, <197 1>,
<198 1>, <199 1>, <200 1>,
<201 1>, <202 1>, <203 1>,
<204 1>, <205 1>, <206 1>,
<207 1>, <208 1>, <209 1>,
<210 1>, <211 1>, <212 1>,
<213 1>, <214 1>, <215 1>,
<216 1>, <217 1>, <218 1>,
<219 1>, <220 1>, <221 1>,
<222 1>, <223 1>, <224 1>,
<225 1>, <226 1>, <227 1>,
<228 1>, <229 1>, <230 1>,
<231 1>, <232 1>, <233 1>,
<234 1>, <235 1>;
gpio-controller;
#gpio-cells = <2>;
pm8921_gpio_keys: gpio-keys {
volume-keys {
pins = "gpio20", "gpio21";
function = "normal";
input-enable;
bias-pull-up;
drive-push-pull;
qcom,drive-strength = <PMIC_GPIO_STRENGTH_NO>;
power-source = <PM8921_GPIO_S4>;
};
};
};