On Fri, Apr 26, 2019 at 10:30:17AM +0200, Michal Vokáč wrote:
> Normally, the MPR121 controller uses separate interrupt line to notify
> the I2C host that a key was touched/released. To support platforms that
> can not use the interrupt line, polling of the MPR121 registers can be
> used.
Other than making the 'interrupts' property optional, that's a driver
change, not a DT change. IOW, we shouldn't need a whole new binding.
>
> Signed-off-by: Michal Vokáč <michal.vokac@xxxxxxxxx>
> ---
> .../bindings/input/mpr121-touchkey-polled.txt | 26 ++++++++++++++++++++++
> 1 file changed, 26 insertions(+)
> create mode 100644 Documentation/devicetree/bindings/input/mpr121-touchkey-polled.txt
>
> diff --git a/Documentation/devicetree/bindings/input/mpr121-touchkey-polled.txt b/Documentation/devicetree/bindings/input/mpr121-touchkey-polled.txt
> new file mode 100644
> index 000000000000..6bb1d312614c
> --- /dev/null
> +++ b/Documentation/devicetree/bindings/input/mpr121-touchkey-polled.txt
> @@ -0,0 +1,26 @@
> +* Freescale MPR121 Controller without interrupt line
> +
> +Required Properties:
> +- compatible: Should be "fsl,mpr121-touchkey-polled"
> +- reg: The I2C slave address of the device.
> +- vdd-supply: Phandle to the Vdd power supply.
> +- linux,keycodes: Specifies an array of numeric keycode values to
> + be used for reporting button presses. The array can
> + contain up to 12 entries.
> +
> +Optional Properties:
> +- autorepeat: Enable autorepeat feature.
> +
> +Example:
> +
> +#include "dt-bindings/input/input.h"
> +
> + touchkeys: keys@5a {
> + compatible = "fsl,mpr121-touchkey-polled";
> + reg = <0x5a>;
> + autorepeat;
> + vdd-supply = <&ldo4_reg>;
> + linux,keycodes = <KEY_0>, <KEY_1>, <KEY_2>, <KEY_3>,
> + <KEY_4> <KEY_5>, <KEY_6>, <KEY_7>,
> + <KEY_8>, <KEY_9>, <KEY_A>, <KEY_B>;
> + };
> --
> 2.1.4
>
