dt-bindings: touchscreen: ti,am3359-tsc: Remove deprecated text file

* TI - TSC ADC (Touschscreen and analog digital converter)

~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~

Required properties:

- mfd

	compatible: Should be

		"ti,am3359-tscadc" for AM335x/AM437x SoCs

		"ti,am654-tscadc", "ti,am3359-tscadc" for AM654 SoCs

- child "tsc"

	compatible: Should be "ti,am3359-tsc".

	ti,wires: Wires refer to application modes i.e. 4/5/8 wire touchscreen

		  support on the platform.

	ti,x-plate-resistance: X plate resistance

	ti,coordinate-readouts: The sequencer supports a total of 16

				programmable steps each step is used to

				read a single coordinate. A single

                                readout is enough but multiple reads can

				increase the quality.

				A value of 5 means, 5 reads for X, 5 for

				Y and 2 for Z (always). This utilises 12

				of the 16 software steps available. The

				remaining 4 can be used by the ADC.

	ti,wire-config: Different boards could have a different order for

			connecting wires on touchscreen. We need to provide an

			8 bit number where in the 1st four bits represent the

			analog lines and the next 4 bits represent positive/

			negative terminal on that input line. Notations to

			represent the input lines and terminals resoectively

			is as follows:

			AIN0 = 0, AIN1 = 1 and so on till AIN7 = 7.

			XP  = 0, XN = 1, YP = 2, YN = 3.

- child "adc"

	compatible: Should be

		    "ti,am3359-adc" for AM335x/AM437x SoCs

		    "ti,am654-adc", "ti,am3359-adc" for AM654 SoCs

	ti,adc-channels: List of analog inputs available for ADC.

			 AIN0 = 0, AIN1 = 1 and so on till AIN7 = 7.

Optional properties:

- child "tsc"

	ti,charge-delay: Length of touch screen charge delay step in terms of

			 ADC clock cycles. Charge delay value should be large

			 in order to avoid false pen-up events. This value

			 effects the overall sampling speed, hence need to be

			 kept as low as possible, while avoiding false pen-up

			 event. Start from a lower value, say 0x400, and

			 increase value until false pen-up events are avoided.

			 The pen-up detection happens immediately after the

			 charge step, so this does in fact function as a

			 hardware knob for adjusting the amount of "settling

			 time".

- child "adc"

	ti,chan-step-opendelay: List of open delays for each channel of

				ADC in the order of ti,adc-channels. The

				value corresponds to the number of ADC

				clock cycles to wait after applying the

				step configuration registers and before

				sending the start of ADC conversion.

				Maximum value is 0x3FFFF.

       ti,chan-step-sampledelay: List of sample delays for each channel

				  of ADC in the order of ti,adc-channels.

				  The value corresponds to the number of

				  ADC clock cycles to sample (to hold

				  start of conversion high).

				  Maximum value is 0xFF.

       ti,chan-step-avg: Number of averages to be performed for each

			  channel of ADC. If average is 16 then input

			  is sampled 16 times and averaged to get more

			  accurate value. This increases the time taken

			  by ADC to generate a sample. Valid range is 0

			  average to 16 averages. Maximum value is 16.

Example:

	tscadc: tscadc@44e0d000 {

		compatible = "ti,am3359-tscadc";

		tsc {

			ti,wires = <4>;

			ti,x-plate-resistance = <200>;

			ti,coordiante-readouts = <5>;

			ti,wire-config = <0x00 0x11 0x22 0x33>;

			ti,charge-delay = <0x400>;

		};

		adc {

			ti,adc-channels = <4 5 6 7>;

			ti,chan-step-opendelay = <0x098 0x3ffff 0x098 0x0>;

			ti,chan-step-sampledelay = <0xff 0x0 0xf 0x0>;

			ti,chan-step-avg = <16 2 4 8>;

		};

	}