rohm,bd8lb600fs-gpio (on bd8lb600fs bus)
Vendor: ROHM Semiconductor Co., Ltd
Description
This is a representation of the Rohm BD8LB600FS SPI Gpio Expander.
Multiple instances may be daisy chained, which can be configured
via the number of supported GPIOs.
Properties
Top level properties
These property descriptions apply to “rohm,bd8lb600fs-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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Convey's this node is a GPIO controller
This property is required. |
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Number of items to expect in a GPIO specifier
This property is required. Constant value: |
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Number of pins for the expander. This must be a multiple of 8.
The number of pins also defines how many devices are daisy chained.
Set to 8 for one instance without daisy chaining.
This property is required. Default value: Legal values: |
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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 “rohm,bd8lb600fs-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