45 lines
1.5 KiB
Plaintext
45 lines
1.5 KiB
Plaintext
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* TI - TSC ADC (Touschscreen and analog digital converter)
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~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
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Required properties:
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- child "tsc"
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ti,wires: Wires refer to application modes i.e. 4/5/8 wire touchscreen
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support on the platform.
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ti,x-plate-resistance: X plate resistance
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ti,coordinate-readouts: The sequencer supports a total of 16
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programmable steps each step is used to
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read a single coordinate. A single
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readout is enough but multiple reads can
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increase the quality.
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A value of 5 means, 5 reads for X, 5 for
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Y and 2 for Z (always). This utilises 12
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of the 16 software steps available. The
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remaining 4 can be used by the ADC.
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ti,wire-config: Different boards could have a different order for
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connecting wires on touchscreen. We need to provide an
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8 bit number where in the 1st four bits represent the
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analog lines and the next 4 bits represent positive/
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negative terminal on that input line. Notations to
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represent the input lines and terminals resoectively
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is as follows:
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AIN0 = 0, AIN1 = 1 and so on till AIN7 = 7.
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XP = 0, XN = 1, YP = 2, YN = 3.
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- child "adc"
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ti,adc-channels: List of analog inputs available for ADC.
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AIN0 = 0, AIN1 = 1 and so on till AIN7 = 7.
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Example:
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tscadc: tscadc@44e0d000 {
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compatible = "ti,am3359-tscadc";
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tsc {
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ti,wires = <4>;
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ti,x-plate-resistance = <200>;
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ti,coordiante-readouts = <5>;
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ti,wire-config = <0x00 0x11 0x22 0x33>;
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};
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adc {
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ti,adc-channels = <4 5 6 7>;
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};
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}
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