| Azoteq IQS550/572/525 Trackpad/Touchscreen Controller |
| |
| Required properties: |
| |
| - compatible : Must be equal to one of the following: |
| "azoteq,iqs550" |
| "azoteq,iqs572" |
| "azoteq,iqs525" |
| |
| - reg : I2C slave address for the device. |
| |
| - interrupts : GPIO to which the device's active-high RDY |
| output is connected (see [0]). |
| |
| - reset-gpios : GPIO to which the device's active-low NRST |
| input is connected (see [1]). |
| |
| Optional properties: |
| |
| - touchscreen-min-x : See [2]. |
| |
| - touchscreen-min-y : See [2]. |
| |
| - touchscreen-size-x : See [2]. If this property is omitted, the |
| maximum x-coordinate is specified by the |
| device's "X Resolution" register. |
| |
| - touchscreen-size-y : See [2]. If this property is omitted, the |
| maximum y-coordinate is specified by the |
| device's "Y Resolution" register. |
| |
| - touchscreen-max-pressure : See [2]. Pressure is expressed as the sum of |
| the deltas across all channels impacted by a |
| touch event. A channel's delta is calculated |
| as its count value minus a reference, where |
| the count value is inversely proportional to |
| the channel's capacitance. |
| |
| - touchscreen-fuzz-x : See [2]. |
| |
| - touchscreen-fuzz-y : See [2]. |
| |
| - touchscreen-fuzz-pressure : See [2]. |
| |
| - touchscreen-inverted-x : See [2]. Inversion is applied relative to that |
| which may already be specified by the device's |
| FLIP_X and FLIP_Y register fields. |
| |
| - touchscreen-inverted-y : See [2]. Inversion is applied relative to that |
| which may already be specified by the device's |
| FLIP_X and FLIP_Y register fields. |
| |
| - touchscreen-swapped-x-y : See [2]. Swapping is applied relative to that |
| which may already be specified by the device's |
| SWITCH_XY_AXIS register field. |
| |
| [0]: Documentation/devicetree/bindings/interrupt-controller/interrupts.txt |
| [1]: Documentation/devicetree/bindings/gpio/gpio.txt |
| [2]: Documentation/devicetree/bindings/input/touchscreen/touchscreen.txt |
| |
| Example: |
| |
| &i2c1 { |
| /* ... */ |
| |
| touchscreen@74 { |
| compatible = "azoteq,iqs550"; |
| reg = <0x74>; |
| interrupt-parent = <&gpio>; |
| interrupts = <17 4>; |
| reset-gpios = <&gpio 27 1>; |
| |
| touchscreen-size-x = <640>; |
| touchscreen-size-y = <480>; |
| |
| touchscreen-max-pressure = <16000>; |
| }; |
| |
| /* ... */ |
| }; |