On 09/07/16 02:24, Alexandre Belloni wrote:
> Add documentation for ADC keys
>
> Signed-off-by: Alexandre Belloni <alexandre.belloni@xxxxxxxxxxxxxxxxxx>
I'm seeing a few more properties in the driver. They may be generic
input ones, but should still be listed here...
autorepeat for example.
> ---
> Changes in v2:
> - fix title
> - use keyup-threshold-mvolt and press-threshold-mvolt instead of
> voltage-keyup-mvolt and voltage-mvolt.
>
> .../devicetree/bindings/input/adc-keys.txt | 45 ++++++++++++++++++++++
> 1 file changed, 45 insertions(+)
> create mode 100644 Documentation/devicetree/bindings/input/adc-keys.txt
>
> diff --git a/Documentation/devicetree/bindings/input/adc-keys.txt b/Documentation/devicetree/bindings/input/adc-keys.txt
> new file mode 100644
> index 000000000000..e43b8979b85a
> --- /dev/null
> +++ b/Documentation/devicetree/bindings/input/adc-keys.txt
> @@ -0,0 +1,45 @@
> +ADC attached resistor ladder buttons
> +------------------------------------
> +
> +Required properties:
> + - compatible: "adc-keys"
> + - io-channels: Phandle to an ADC channel
> + - io-channel-names = "buttons";
> + - keyup-threshold-mvolt: Voltage at which all the keys are considered up.
> +
> +Each key is represented as a sub-node of "adc-keys":
> +
> +Required subnode-properties:
> + - label: Descriptive name of the key.
> + - linux,code: Keycode to emit.
> + - press-threshold-mvolt: Voltage adc input when this key is pressed.
> +
> +Example:
> +
> +#include <dt-bindings/input/input.h>
> +
> + adc-keys {
> + compatible = "adc-keys";
> + io-channels = <&lradc 0>;
> + io-channel-names = "buttons";
> + keyup-threshold-mvolt = <2000>;
> +
> + button@1500 {
> + label = "Volume Up";
> + linux,code = <KEY_VOLUMEUP>;
> + press-threshold-mvolt = <1500>;
> + };
> +
> + button@1000 {
> + label = "Volume Down";
> + linux,code = <KEY_VOLUMEDOWN>;
> + press-threshold-mvolt = <1000>;
> + };
> +
> + button@500 {
> + label = "Enter";
> + linux,code = <KEY_ENTER>;
> + press-threshold-mvolt = <500>;
> + };
> + };
> +
>
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