Commit | Line | Data |
---|---|---|
037db524 VKS |
1 | STMPE Touchscreen |
2 | ---------------- | |
3 | ||
4 | Required properties: | |
5 | - compatible: "st,stmpe-ts" | |
6 | ||
7 | Optional properties: | |
8 | - st,sample-time: ADC converstion time in number of clock. (0 -> 36 clocks, 1 -> | |
9 | 44 clocks, 2 -> 56 clocks, 3 -> 64 clocks, 4 -> 80 clocks, 5 -> 96 clocks, 6 | |
10 | -> 144 clocks), recommended is 4. | |
11 | - st,mod-12b: ADC Bit mode (0 -> 10bit ADC, 1 -> 12bit ADC) | |
12 | - st,ref-sel: ADC reference source (0 -> internal reference, 1 -> external | |
13 | reference) | |
14 | - st,adc-freq: ADC Clock speed (0 -> 1.625 MHz, 1 -> 3.25 MHz, 2 || 3 -> 6.5 MHz) | |
15 | - st,ave-ctrl: Sample average control (0 -> 1 sample, 1 -> 2 samples, 2 -> 4 | |
16 | samples, 3 -> 8 samples) | |
17 | - st,touch-det-delay: Touch detect interrupt delay (0 -> 10 us, 1 -> 50 us, 2 -> | |
18 | 100 us, 3 -> 500 us, 4-> 1 ms, 5 -> 5 ms, 6 -> 10 ms, 7 -> 50 ms) recommended | |
19 | is 3 | |
20 | - st,settling: Panel driver settling time (0 -> 10 us, 1 -> 100 us, 2 -> 500 us, 3 | |
21 | -> 1 ms, 4 -> 5 ms, 5 -> 10 ms, 6 for 50 ms, 7 -> 100 ms) recommended is 2 | |
22 | - st,fraction-z: Length of the fractional part in z (fraction-z ([0..7]) = Count of | |
23 | the fractional part) recommended is 7 | |
24 | - st,i-drive: current limit value of the touchscreen drivers (0 -> 20 mA typical 35 | |
25 | mA max, 1 -> 50 mA typical 80 mA max) | |
26 | ||
27 | Node name must be stmpe_touchscreen and should be child node of stmpe node to | |
28 | which it belongs. | |
29 | ||
30 | Example: | |
31 | ||
32 | stmpe_touchscreen { | |
33 | compatible = "st,stmpe-ts"; | |
34 | st,sample-time = <4>; | |
35 | st,mod-12b = <1>; | |
36 | st,ref-sel = <0>; | |
37 | st,adc-freq = <1>; | |
38 | st,ave-ctrl = <1>; | |
39 | st,touch-det-delay = <2>; | |
40 | st,settling = <2>; | |
41 | st,fraction-z = <7>; | |
42 | st,i-drive = <1>; | |
43 | }; |