Qualcomm PMIC GPIO block
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This binding describes the GPIO block(s) found in the 8xxx series of
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PMIC's from Qualcomm.
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- compatible:
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Usage: required
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Value type: <string>
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Definition: must be one of:
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"qcom,pm8005-gpio"
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"qcom,pm8018-gpio"
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"qcom,pm8038-gpio"
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"qcom,pm8058-gpio"
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"qcom,pm8916-gpio"
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"qcom,pm8917-gpio"
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"qcom,pm8921-gpio"
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"qcom,pm8941-gpio"
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"qcom,pm8994-gpio"
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"qcom,pm8998-gpio"
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"qcom,pma8084-gpio"
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"qcom,pmi8994-gpio"
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And must contain either "qcom,spmi-gpio" or "qcom,ssbi-gpio"
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if the device is on an spmi bus or an ssbi bus respectively
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- reg:
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Usage: required
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Value type: <prop-encoded-array>
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Definition: Register base of the GPIO block and length.
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- interrupts:
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Usage: required
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Value type: <prop-encoded-array>
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Definition: Must contain an array of encoded interrupt specifiers for
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each available GPIO
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- gpio-controller:
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Usage: required
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Value type: <none>
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Definition: Mark the device node as a GPIO controller
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- #gpio-cells:
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Usage: required
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Value type: <u32>
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Definition: Must be 2;
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the first cell will be used to define gpio number and the
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second denotes the flags for this gpio
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Please refer to ../gpio/gpio.txt and ../interrupt-controller/interrupts.txt for
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a general description of GPIO and interrupt bindings.
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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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The pin configuration nodes act as a container for an arbitrary number of
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subnodes. Each of these subnodes represents some desired configuration for a
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pin or a list of pins. This configuration can include the
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mux function to select on those pin(s), and various pin configuration
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parameters, as listed below.
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SUBNODES:
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The name of each subnode is not important; all subnodes should be enumerated
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and processed purely based on their content.
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Each subnode only affects those parameters that are explicitly listed. In
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other words, a subnode that lists a mux function but no pin configuration
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parameters implies no information about any pin configuration parameters.
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Similarly, a pin subnode that describes a pullup parameter implies no
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information about e.g. the mux function.
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The following generic properties as defined in pinctrl-bindings.txt are valid
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to specify in a pin configuration subnode:
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- pins:
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Usage: required
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Value type: <string-array>
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Definition: List of gpio pins affected by the properties specified in
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this subnode. Valid pins are:
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gpio1-gpio4 for pm8005
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gpio1-gpio6 for pm8018
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gpio1-gpio12 for pm8038
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gpio1-gpio40 for pm8058
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gpio1-gpio4 for pm8916
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gpio1-gpio38 for pm8917
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gpio1-gpio44 for pm8921
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gpio1-gpio36 for pm8941
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gpio1-gpio22 for pm8994
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gpio1-gpio26 for pm8998
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gpio1-gpio22 for pma8084
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gpio1-gpio10 for pmi8994
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- function:
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Usage: required
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Value type: <string>
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Definition: Specify the alternative function to be configured for the
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specified pins. Valid values are:
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"normal",
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"paired",
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"func1",
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"func2",
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"dtest1",
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"dtest2",
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"dtest3",
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"dtest4",
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And following values are supported by LV/MV GPIO subtypes:
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"func3",
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"func4"
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- bias-disable:
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Usage: optional
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Value type: <none>
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Definition: The specified pins should be configured as no pull.
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- bias-pull-down:
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Usage: optional
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Value type: <none>
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Definition: The specified pins should be configured as pull down.
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- bias-pull-up:
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Usage: optional
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Value type: <empty>
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Definition: The specified pins should be configured as pull up.
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- qcom,pull-up-strength:
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Usage: optional
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Value type: <u32>
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Definition: Specifies the strength to use for pull up, if selected.
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Valid values are; as defined in
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<dt-bindings/pinctrl/qcom,pmic-gpio.h>:
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1: 30uA (PMIC_GPIO_PULL_UP_30)
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2: 1.5uA (PMIC_GPIO_PULL_UP_1P5)
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3: 31.5uA (PMIC_GPIO_PULL_UP_31P5)
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4: 1.5uA + 30uA boost (PMIC_GPIO_PULL_UP_1P5_30)
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If this property is omitted 30uA strength will be used if
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pull up is selected
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- bias-high-impedance:
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Usage: optional
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Value type: <none>
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Definition: The specified pins will put in high-Z mode and disabled.
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- input-enable:
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Usage: optional
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Value type: <none>
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Definition: The specified pins are put in input mode.
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- output-high:
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Usage: optional
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Value type: <none>
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Definition: The specified pins are configured in output mode, driven
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high.
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- output-low:
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Usage: optional
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Value type: <none>
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Definition: The specified pins are configured in output mode, driven
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low.
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- power-source:
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Usage: optional
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Value type: <u32>
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Definition: Selects the power source for the specified pins. Valid
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power sources are defined per chip in
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<dt-bindings/pinctrl/qcom,pmic-gpio.h>
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- qcom,drive-strength:
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Usage: optional
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Value type: <u32>
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Definition: Selects the drive strength for the specified pins. Value
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drive strengths are:
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0: no (PMIC_GPIO_STRENGTH_NO)
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1: high (PMIC_GPIO_STRENGTH_HIGH) 0.9mA @ 1.8V - 1.9mA @ 2.6V
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2: medium (PMIC_GPIO_STRENGTH_MED) 0.6mA @ 1.8V - 1.25mA @ 2.6V
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3: low (PMIC_GPIO_STRENGTH_LOW) 0.15mA @ 1.8V - 0.3mA @ 2.6V
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as defined in <dt-bindings/pinctrl/qcom,pmic-gpio.h>
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- drive-push-pull:
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Usage: optional
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Value type: <none>
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Definition: The specified pins are configured in push-pull mode.
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- drive-open-drain:
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Usage: optional
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Value type: <none>
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Definition: The specified pins are configured in open-drain mode.
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- drive-open-source:
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Usage: optional
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Value type: <none>
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Definition: The specified pins are configured in open-source mode.
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- qcom,analog-pass:
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Usage: optional
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Value type: <none>
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Definition: The specified pins are configured in analog-pass-through mode.
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- qcom,atest:
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Usage: optional
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Value type: <u32>
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Definition: Selects ATEST rail to route to GPIO when it's configured
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in analog-pass-through mode.
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Valid values are 1-4 corresponding to ATEST1 to ATEST4.
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- qcom,dtest-buffer:
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Usage: optional
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Value type: <u32>
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Definition: Selects DTEST rail to route to GPIO when it's configured
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as digital input.
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Valid values are 1-4 corresponding to DTEST1 to DTEST4.
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Example:
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pm8921_gpio: gpio@150 {
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compatible = "qcom,pm8921-gpio", "qcom,ssbi-gpio";
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reg = <0x150 0x160>;
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interrupts = <192 1>, <193 1>, <194 1>,
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<195 1>, <196 1>, <197 1>,
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<198 1>, <199 1>, <200 1>,
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<201 1>, <202 1>, <203 1>,
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<204 1>, <205 1>, <206 1>,
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<207 1>, <208 1>, <209 1>,
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<210 1>, <211 1>, <212 1>,
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<213 1>, <214 1>, <215 1>,
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<216 1>, <217 1>, <218 1>,
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<219 1>, <220 1>, <221 1>,
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<222 1>, <223 1>, <224 1>,
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<225 1>, <226 1>, <227 1>,
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<228 1>, <229 1>, <230 1>,
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<231 1>, <232 1>, <233 1>,
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<234 1>, <235 1>;
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gpio-controller;
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#gpio-cells = <2>;
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pm8921_gpio_keys: gpio-keys {
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volume-keys {
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pins = "gpio20", "gpio21";
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function = "normal";
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input-enable;
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bias-pull-up;
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drive-push-pull;
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qcom,drive-strength = <PMIC_GPIO_STRENGTH_NO>;
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power-source = <PM8921_GPIO_S4>;
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};
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};
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};
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