1*4882a593SmuzhiyunFreescale mx25 TS conversion queue module 2*4882a593Smuzhiyun 3*4882a593Smuzhiyunmx25 touchscreen conversion queue module which controls the ADC unit of the 4*4882a593Smuzhiyunmx25 for attached touchscreens. 5*4882a593Smuzhiyun 6*4882a593SmuzhiyunRequired properties: 7*4882a593Smuzhiyun - compatible: Should be "fsl,imx25-tcq". 8*4882a593Smuzhiyun - reg: Memory range of the device. 9*4882a593Smuzhiyun - interrupts: Should be the interrupt number associated with this module within 10*4882a593Smuzhiyun the tscadc unit (<0>). 11*4882a593Smuzhiyun - fsl,wires: Should be '<4>' or '<5>' 12*4882a593Smuzhiyun 13*4882a593SmuzhiyunOptional properties: 14*4882a593Smuzhiyun - fsl,pen-debounce-ns: Pen debounce time in nanoseconds. 15*4882a593Smuzhiyun - fsl,pen-threshold: Pen-down threshold for the touchscreen. This is a value 16*4882a593Smuzhiyun between 1 and 4096. It is the ratio between the internal reference voltage 17*4882a593Smuzhiyun and the measured voltage after the plate was precharged. Resistance between 18*4882a593Smuzhiyun plates and therefore the voltage decreases with pressure so that a smaller 19*4882a593Smuzhiyun value is equivalent to a higher pressure. 20*4882a593Smuzhiyun - fsl,settling-time-ns: Settling time in nanoseconds. The settling time is before 21*4882a593Smuzhiyun the actual touch detection to wait for an even charge distribution in the 22*4882a593Smuzhiyun plate. 23*4882a593Smuzhiyun 24*4882a593SmuzhiyunThis device includes two conversion queues which can be added as subnodes. 25*4882a593SmuzhiyunThe first queue is for the touchscreen, the second for general purpose ADC. 26*4882a593Smuzhiyun 27*4882a593SmuzhiyunExample: 28*4882a593Smuzhiyun tsc: tcq@50030400 { 29*4882a593Smuzhiyun compatible = "fsl,imx25-tcq"; 30*4882a593Smuzhiyun reg = <0x50030400 0x60>; 31*4882a593Smuzhiyun interrupt-parent = <&tscadc>; 32*4882a593Smuzhiyun interrupts = <0>; 33*4882a593Smuzhiyun fsl,wires = <4>; 34*4882a593Smuzhiyun }; 35