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nxp,s32-gpio

Description

NXP S32 GPIO controller.

The GPIO controller provides the option to route external input pad interrupts
to either the SIUL2 EIRQ interrupt controller or, when available on the SoC,
the WKPU interrupt controller. By default, GPIO interrupts are routed to the
SIUL2 EIRQ interrupt controller.

To route external interrupts to the WKPU interrupt controller, the GPIO
specifier must be supplied with the flag `NXP_S32_GPIO_INT_WKPU`. For example,
the following snippet of devicetree source code instructs the GPIO controller
to route the interrupt from pin 9 of `gpioa` to the WKPU interrupt controller:

  #include <zephyr/dt-bindings/gpio/nxp-s32-gpio.h>

  &device {
      gpios = <&gpioa 9 (NXP_S32_GPIO_INT_WKPU | GPIO_ACTIVE_HIGH)>;
  };

Explicitly specifying the routing of a GPIO interrupt to a particular
interrupt controller allows for the allocation of distinct interrupt
priorities according to application-specific requirements. This is owing to
the fact that each interrupt controller features its own interrupt vector.
To illustrate, it is plausible to allocate the board's button interrupts to
the interrupt controller configured with a lower priority compared to the one
designated for the data-ready interrupt originating from a sensor. This
decision is justified by the potentially higher importance of the latter
interrupt to the overall system operation.

The `NXP_S32_GPIO_INT_WKPU` flag is intended exclusively for specifying WKPU
as the interrupt controller for the corresponding GPIO. It's worth noting that
despite being named WKPU, the flag is not meant to configure GPIOs as wake-up
sources.

Properties

Top level properties

These property descriptions apply to “nxp,s32-gpio” nodes themselves. This page also describes child node properties in the following sections.

Properties not inherited from the base binding file.

Name	Type	Details
`gpio-controller`	`boolean`	Convey's this node is a GPIO controller This property is required.
`#gpio-cells`	`int`	Number of items to expect in a GPIO specifier This property is required. Constant value: `2`
`ngpios`	`int`	This property indicates the number of in-use slots of available slots for GPIOs. The typical example is something like this: the hardware register is 32 bits wide, but only 18 of the bits have a physical counterpart. The driver is generally written so that all 32 bits can be used, but the IP block is reused in a lot of designs, some using all 32 bits, some using 18 and some using 12. In this case, setting "ngpios = <18>;" informs the driver that only the first 18 GPIOs, at local offset 0 .. 17, are in use. For cases in which there might be holes in the slot range, this value should be the max slot number+1. Default value: `32`
`gpio-reserved-ranges`	`array`	If not all the GPIOs at offsets 0...N-1 are usable for ngpios = <N>, then this property contains an additional set of tuples which specify which GPIOs are unusable. This property indicates the start and size of the GPIOs that can't be used. For example, setting "gpio-reserved-ranges = <3 2>, <10 1>;" means that GPIO offsets 3, 4, and 10 are not usable, even if ngpios = <18>.
`gpio-line-names`	`string-array`	This is an array of strings defining the names of the GPIO lines going out of the GPIO controller
`nxp,wkpu`	`phandle`	NXP WKPU controller associated to this GPIO port.
`nxp,wkpu-interrupts`	`array`	Map between WKPU external interrupt sources and pins of this GPIO port, as in a tuple `<gpio-pin wkpu-interrupt-source>`.

Properties inherited from the base binding file, which defines common properties that may be set on many nodes. Not all of these may apply to the “nxp,s32-gpio” compatible.

Name	Type	Details
`wakeup-source`	`boolean`	Property to identify that a device can be used as wake up source. When this property is provided a specific flag is set into the device that tells the system that the device is capable of wake up the system. Wake up capable devices are disabled (interruptions will not wake up the system) by default but they can be enabled at runtime if necessary.
`power-domain`	`phandle`	Power domain the device belongs to. The device will be notified when the power domain it belongs to is either suspended or resumed.
`zephyr,pm-device-runtime-auto`	`boolean`	Automatically configure the device for runtime power management after the init function runs.
`zephyr,disabling-power-states`	`phandles`	List of power states that will disable this device power.
`status`	`string`	indicates the operational status of a device Legal values: `'ok'`, `'okay'`, `'disabled'`, `'reserved'`, `'fail'`, `'fail-sss'` See Important properties for more information.
`compatible`	`string-array`	compatible strings This property is required. See Important properties for more information.
`reg`	`array`	register space This property is required. See Important properties for more information.
`reg-names`	`string-array`	name of each register space This property is required.
`interrupts`	`array`	For GPIO ports that have pins can be used for processing external interrupt signal, this is a list of GPIO pins and respective external interrupt lines (<gpio-pin eirq-line>). See Important properties for more information.
`interrupts-extended`	`compound`	extended interrupt specifier for device
`interrupt-names`	`string-array`	name of each interrupt
`interrupt-parent`	`phandle`	phandle to interrupt controller node
`label`	`string`	Human readable string describing the device (used as device_get_binding() argument) See Important properties for more information. This property is deprecated.
`clocks`	`phandle-array`	Clock gate information
`clock-names`	`string-array`	name of each clock
`#address-cells`	`int`	number of address cells in reg property
`#size-cells`	`int`	number of size cells in reg property
`dmas`	`phandle-array`	DMA channels specifiers
`dma-names`	`string-array`	Provided names of DMA channel specifiers
`io-channels`	`phandle-array`	IO channels specifiers
`io-channel-names`	`string-array`	Provided names of IO channel specifiers
`mboxes`	`phandle-array`	mailbox / IPM channels specifiers
`mbox-names`	`string-array`	Provided names of mailbox / IPM channel specifiers
`zephyr,deferred-init`	`boolean`	Do not initialize device automatically on boot. Device should be manually initialized using device_init().

Child node properties

Name	Type	Details
`gpio-hog`	`boolean`	Conveys this node is a GPIO hog. This property is required.
`gpios`	`array`	This is an array of GPIO specifiers (e.g. pin, flags) to be hogged. The number of array entries must be an integer multiple of the number of GPIO specifier cells for the parent GPIO controller. This property is required.
`input`	`boolean`	If this property is set, the GPIO is configured as an input. This property takes precedence over the output-low and output-high properties.
`output-low`	`boolean`	If this property is set, the GPIO is configured as an output set to logical low. This property takes precedence over the output-high property.
`output-high`	`boolean`	If this property is set, the GPIO is configured as an output set to logical high.
`line-name`	`string`	Optional GPIO line name.

Specifier cell names

gpio cells: pin, flags