1 Freescale mx25 TS conversion queue module 1 Freescale mx25 TS conversion queue module
2 2
3 mx25 touchscreen conversion queue module which 3 mx25 touchscreen conversion queue module which controls the ADC unit of the
4 mx25 for attached touchscreens. 4 mx25 for attached touchscreens.
5 5
6 Required properties: 6 Required properties:
7 - compatible: Should be "fsl,imx25-tcq". 7 - compatible: Should be "fsl,imx25-tcq".
8 - reg: Memory range of the device. 8 - reg: Memory range of the device.
9 - interrupts: Should be the interrupt number 9 - interrupts: Should be the interrupt number associated with this module within
10 the tscadc unit (<0>). 10 the tscadc unit (<0>).
11 - fsl,wires: Should be '<4>' or '<5>' 11 - fsl,wires: Should be '<4>' or '<5>'
12 12
13 Optional properties: 13 Optional properties:
14 - fsl,pen-debounce-ns: Pen debounce time in n 14 - fsl,pen-debounce-ns: Pen debounce time in nanoseconds.
15 - fsl,pen-threshold: Pen-down threshold for t 15 - fsl,pen-threshold: Pen-down threshold for the touchscreen. This is a value
16 between 1 and 4096. It is the ratio between 16 between 1 and 4096. It is the ratio between the internal reference voltage
17 and the measured voltage after the plate wa 17 and the measured voltage after the plate was precharged. Resistance between
18 plates and therefore the voltage decreases 18 plates and therefore the voltage decreases with pressure so that a smaller
19 value is equivalent to a higher pressure. 19 value is equivalent to a higher pressure.
20 - fsl,settling-time-ns: Settling time in nano 20 - fsl,settling-time-ns: Settling time in nanoseconds. The settling time is before
21 the actual touch detection to wait for an e 21 the actual touch detection to wait for an even charge distribution in the
22 plate. 22 plate.
23 23
24 This device includes two conversion queues whi 24 This device includes two conversion queues which can be added as subnodes.
25 The first queue is for the touchscreen, the se 25 The first queue is for the touchscreen, the second for general purpose ADC.
26 26
27 Example: 27 Example:
28 tsc: tcq@50030400 { 28 tsc: tcq@50030400 {
29 compatible = "fsl,imx25-tcq"; 29 compatible = "fsl,imx25-tcq";
30 reg = <0x50030400 0x60>; 30 reg = <0x50030400 0x60>;
31 interrupt-parent = <&tscadc>; 31 interrupt-parent = <&tscadc>;
32 interrupts = <0>; 32 interrupts = <0>;
33 fsl,wires = <4>; 33 fsl,wires = <4>;
34 }; 34 };
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