awinic,aw9523b-gpio (on aw9523b bus)
Vendor: Shanghai Awinic Technology Co., Ltd.
Note
An implementation of a driver matching this compatible is available in drivers/gpio/gpio_aw9523b.c.
Description
AW9523B GPIO Controller
Properties
Top level properties
These property descriptions apply to “awinic,aw9523b-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 |
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Set GPIO connected to the controller INTN pin.
This is used for notifying interruption.
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Set GPIO connected to the controller RSTN pin.
This is used for controlling resets via GPIO.
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Configure Port0 to Push-Pull mode.
Port0 is worked in Open-Drain mode by default.
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Number of items to expect in a GPIO specifier
This property is required. Constant value: |
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Convey's this node is a GPIO controller
This property is required. |
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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: |
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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>.
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This is an array of strings defining the names of the GPIO lines
going out of the GPIO controller
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Deprecated properties not inherited from the base binding file.
(None)
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 “awinic,aw9523b-gpio” compatible.
(None)
Child node properties
Name |
Type |
Details |
|---|---|---|
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Conveys this node is a GPIO hog.
This property is required. |
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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. |
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If this property is set, the GPIO is configured as an input. This property takes
precedence over the output-low and output-high properties.
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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.
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If this property is set, the GPIO is configured as an output set to logical high.
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Optional GPIO line name.
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Specifier cell names
gpio cells: pin, flags