| Freescale mx25 TS conversion queue module | |
| mx25 touchscreen conversion queue module which controls the ADC unit of the | |
| mx25 for attached touchscreens. | |
| Required properties: | |
| - compatible: Should be "fsl,imx25-tcq". | |
| - reg: Memory range of the device. | |
| - interrupts: Should be the interrupt number associated with this module within | |
| the tscadc unit (<0>). | |
| - interrupt-parent: Should be a phandle to the tscadc unit. | |
| - fsl,wires: Should be '<4>' or '<5>' | |
| Optional properties: | |
| - fsl,pen-debounce-ns: Pen debounce time in nanoseconds. | |
| - fsl,pen-threshold: Pen-down threshold for the touchscreen. This is a value | |
| between 1 and 4096. It is the ratio between the internal reference voltage | |
| and the measured voltage after the plate was precharged. Resistance between | |
| plates and therefore the voltage decreases with pressure so that a smaller | |
| value is equivalent to a higher pressure. | |
| - fsl,settling-time-ns: Settling time in nanoseconds. The settling time is before | |
| the actual touch detection to wait for an even charge distribution in the | |
| plate. | |
| This device includes two conversion queues which can be added as subnodes. | |
| The first queue is for the touchscreen, the second for general purpose ADC. | |
| Example: | |
| tsc: tcq@50030400 { | |
| compatible = "fsl,imx25-tcq"; | |
| reg = <0x50030400 0x60>; | |
| interrupt-parent = <&tscadc>; | |
| interrupts = <0>; | |
| fsl,wires = <4>; | |
| }; |