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Diffstat (limited to 'Documentation/devicetree/bindings/input/adc-keys.yaml')
-rw-r--r-- | Documentation/devicetree/bindings/input/adc-keys.yaml | 103 |
1 files changed, 103 insertions, 0 deletions
diff --git a/Documentation/devicetree/bindings/input/adc-keys.yaml b/Documentation/devicetree/bindings/input/adc-keys.yaml new file mode 100644 index 0000000000..7aa078dead --- /dev/null +++ b/Documentation/devicetree/bindings/input/adc-keys.yaml @@ -0,0 +1,103 @@ +# SPDX-License-Identifier: GPL-2.0 +%YAML 1.2 +--- +$id: http://devicetree.org/schemas/input/adc-keys.yaml# +$schema: http://devicetree.org/meta-schemas/core.yaml# + +title: ADC attached resistor ladder buttons + +maintainers: + - Alexandre Belloni <alexandre.belloni@bootlin.com> + +allOf: + - $ref: input.yaml# + +properties: + compatible: + const: adc-keys + + io-channels: + maxItems: 1 + + io-channel-names: + const: buttons + + keyup-threshold-microvolt: + description: + Voltage above or equal to which all the keys are considered up. + + poll-interval: true + autorepeat: true + +patternProperties: + '^button-': + type: object + $ref: input.yaml# + additionalProperties: false + description: + Each button (key) is represented as a sub-node. + + properties: + label: true + + linux,code: true + + press-threshold-microvolt: + description: + Voltage above or equal to which this key is considered pressed. No + two values of press-threshold-microvolt may be the same. All values + of press-threshold-microvolt must be less than + keyup-threshold-microvolt. + + required: + - linux,code + - press-threshold-microvolt + +required: + - compatible + - io-channels + - io-channel-names + - keyup-threshold-microvolt + +additionalProperties: false + +examples: + - | + #include <dt-bindings/input/input.h> + // +--------------------------------+------------------------+ + // | 2.000.000 <= value | no key pressed | + // +--------------------------------+------------------------+ + // | 1.500.000 <= value < 2.000.000 | KEY_VOLUMEUP pressed | + // +--------------------------------+------------------------+ + // | 1.000.000 <= value < 1.500.000 | KEY_VOLUMEDOWN pressed | + // +--------------------------------+------------------------+ + // | 500.000 <= value < 1.000.000 | KEY_ENTER pressed | + // +--------------------------------+------------------------+ + // | value < 500.000 | no key pressed | + // +--------------------------------+------------------------+ + + adc-keys { + compatible = "adc-keys"; + io-channels = <&lradc 0>; + io-channel-names = "buttons"; + keyup-threshold-microvolt = <2000000>; + + button-up { + label = "Volume Up"; + linux,code = <KEY_VOLUMEUP>; + press-threshold-microvolt = <1500000>; + }; + + button-down { + label = "Volume Down"; + linux,code = <KEY_VOLUMEDOWN>; + press-threshold-microvolt = <1000000>; + }; + + button-enter { + label = "Enter"; + linux,code = <KEY_ENTER>; + press-threshold-microvolt = <500000>; + }; + }; +... |