88 lines
3.3 KiB
Plaintext
88 lines
3.3 KiB
Plaintext
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* Broadcom's IPROC Touchscreen Controller
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Required properties:
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- compatible: must be "brcm,iproc-touchscreen"
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- ts_syscon: handler of syscon node defining physical base
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address of the controller and length of memory mapped region.
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If this property is selected please make sure MFD_SYSCON config
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is enabled in the defconfig file.
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- clocks: The clock provided by the SOC to driver the tsc
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- clock-names: name for the clock
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- interrupts: The touchscreen controller's interrupt
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- address-cells: Specify the number of u32 entries needed in child nodes.
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Should set to 1.
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- size-cells: Specify number of u32 entries needed to specify child nodes size
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in reg property. Should set to 1.
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Optional properties:
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- scanning_period: Time between scans. Each step is 1024 us. Valid 1-256.
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- debounce_timeout: Each step is 512 us. Valid 0-255
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- settling_timeout: The settling duration (in ms) is the amount of time
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the tsc waits to allow the voltage to settle after
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turning on the drivers in detection mode.
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Valid values: 0-11
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0 = 0.008 ms
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1 = 0.01 ms
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2 = 0.02 ms
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3 = 0.04 ms
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4 = 0.08 ms
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5 = 0.16 ms
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6 = 0.32 ms
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7 = 0.64 ms
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8 = 1.28 ms
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9 = 2.56 ms
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10 = 5.12 ms
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11 = 10.24 ms
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- touch_timeout: The continuous number of scan periods in which touch is
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not detected before the controller returns to idle state.
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Valid values 0-255.
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- average_data: Number of data samples which are averaged before a final
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data point is placed into the FIFO
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Valid values 0-7
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0 = 1 sample
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1 = 2 samples
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2 = 4 samples
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3 = 8 samples
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4 = 16 samples
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5 = 32 samples
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6 = 64 samples
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7 = 128 samples
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- fifo_threshold: Interrupt is generated whenever the number of fifo
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entries exceeds this value
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Valid values 0-31
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- touchscreen-size-x: horizontal resolution of touchscreen (in pixels)
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- touchscreen-size-y: vertical resolution of touchscreen (in pixels)
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- touchscreen-fuzz-x: horizontal noise value of the absolute input
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device (in pixels)
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- touchscreen-fuzz-y: vertical noise value of the absolute input
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device (in pixels)
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- touchscreen-inverted-x: X axis is inverted (boolean)
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- touchscreen-inverted-y: Y axis is inverted (boolean)
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Example: An example of touchscreen node
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ts_adc_syscon: ts_adc_syscon@180a6000 {
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compatible = "brcm,iproc-ts-adc-syscon","syscon";
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reg = <0x180a6000 0xc30>;
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};
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touchscreen: touchscreen@180A6000 {
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compatible = "brcm,iproc-touchscreen";
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#address-cells = <1>;
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#size-cells = <1>;
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ts_syscon = <&ts_adc_syscon>;
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clocks = <&adc_clk>;
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clock-names = "tsc_clk";
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interrupts = <GIC_SPI 164 IRQ_TYPE_LEVEL_HIGH>;
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scanning_period = <5>;
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debounce_timeout = <40>;
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settling_timeout = <7>;
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touch_timeout = <10>;
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average_data = <5>;
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fifo_threshold = <1>;
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/* Touchscreen is rotated 180 degrees. */
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touchscreen-inverted-x;
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touchscreen-inverted-y;
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};
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