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dts: bindings: gpio: controller: add dts binding support for GPIO hogs

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Each GPIO controller may contain GPIO hog definitions. GPIO hogging is a
mechanism for providing automatic GPIO configuration during system
initialization.

Each GPIO hog is represented as a child node of the GPIO controller.

Signed-off-by: Henrik Brix Andersen <hebad@vestas.com>
This commit is contained in:
Henrik Brix Andersen 2022-10-25 12:21:31 +02:00 committed by Marti Bolivar
parent 98112542c2
commit b208f4da98
1 changed files with 60 additions and 0 deletions
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60
dts/bindings/gpio/gpio-controller.yaml
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@ -40,3 +40,63 @@ properties:
description: |
This is an array of strings defining the names of the GPIO lines
going out of the GPIO controller
child-binding:
description: |
Optional GPIO hog configuration.
Each GPIO controller may contain GPIO hog definitions. GPIO hogging is a mechanism for
providing automatic GPIO configuration during driver initialization when Kconfig
CONFIG_GPIO_HOGS is enabled.
Each GPIO hog is represented as a child node of the GPIO controller.
Example:
&gpio1 {
mux-hog {
gpio-hog;
gpios = <10 GPIO_ACTIVE_HIGH>, <11 GPIO_ACTIVE_HIGH>;
output-high;
};
};
&gpio2 {
test-hog {
gpio-hog;
gpios = <26 GPIO_ACTIVE_HIGH>;
output-low;
line-name = "test";
};
};
properties:
gpio-hog:
type: boolean
required: true
description: |
Conveys this node is a GPIO hog.
gpios:
type: array
required: true
description: |
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.
input:
type: boolean
description: |
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:
type: boolean
description: |
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:
type: boolean
description: |
If this property is set, the GPIO is configured as an output set to logical high.
line-name:
type: string
description: |
Optional GPIO line name.