1STMPE Touchscreen 2---------------- 3 4Required properties: 5 - compatible: "st,stmpe-ts" 6 7Optional 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 27Node name must be stmpe_touchscreen and should be child node of stmpe node to 28which it belongs. 29 30Example: 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 }; 44