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106 lines
3.6 KiB
106 lines
3.6 KiB
Device tree bindings for TI's ADS7843, ADS7845, ADS7846, ADS7873, TSC2046 |
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SPI driven touch screen controllers. |
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The node for this driver must be a child node of a SPI controller, hence |
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all mandatory properties described in |
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Documentation/devicetree/bindings/spi/spi-bus.txt |
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must be specified. |
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Additional required properties: |
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compatible Must be one of the following, depending on the |
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model: |
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"ti,tsc2046" |
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"ti,ads7843" |
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"ti,ads7845" |
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"ti,ads7846" |
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"ti,ads7873" |
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interrupts An interrupt node describing the IRQ line the chip's |
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!PENIRQ pin is connected to. |
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vcc-supply A regulator node for the supply voltage. |
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Optional properties: |
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ti,vref-delay-usecs vref supply delay in usecs, 0 for |
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external vref (u16). |
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ti,vref-mv The VREF voltage, in millivolts (u16). |
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Set to 0 to use internal references |
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(ADS7846). |
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ti,keep-vref-on set to keep vref on for differential |
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measurements as well |
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ti,settle-delay-usec Settling time of the analog signals; |
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a function of Vcc and the capacitance |
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on the X/Y drivers. If set to non-zero, |
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two samples are taken with settle_delay |
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us apart, and the second one is used. |
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~150 uSec with 0.01uF caps (u16). |
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ti,penirq-recheck-delay-usecs If set to non-zero, after samples are |
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taken this delay is applied and penirq |
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is rechecked, to help avoid false |
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events. This value is affected by the |
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material used to build the touch layer |
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(u16). |
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ti,x-plate-ohms Resistance of the X-plate, |
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in Ohms (u16). |
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ti,y-plate-ohms Resistance of the Y-plate, |
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in Ohms (u16). |
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ti,x-min Minimum value on the X axis (u16). |
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ti,y-min Minimum value on the Y axis (u16). |
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ti,debounce-tol Tolerance used for filtering (u16). |
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ti,debounce-rep Additional consecutive good readings |
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required after the first two (u16). |
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ti,pendown-gpio-debounce Platform specific debounce time for the |
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pendown-gpio (u32). |
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pendown-gpio GPIO handle describing the pin the !PENIRQ |
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line is connected to. |
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wakeup-source use any event on touchscreen as wakeup event. |
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(Legacy property support: "linux,wakeup") |
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touchscreen-size-x General touchscreen binding, see [1]. |
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touchscreen-size-y General touchscreen binding, see [1]. |
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touchscreen-max-pressure General touchscreen binding, see [1]. |
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touchscreen-min-pressure General touchscreen binding, see [1]. |
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touchscreen-average-samples General touchscreen binding, see [1]. |
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touchscreen-inverted-x General touchscreen binding, see [1]. |
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touchscreen-inverted-y General touchscreen binding, see [1]. |
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touchscreen-swapped-x-y General touchscreen binding, see [1]. |
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[1] All general touchscreen properties are described in |
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Documentation/devicetree/bindings/input/touchscreen/touchscreen.txt. |
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Deprecated properties: |
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ti,swap-xy swap x and y axis |
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ti,x-max Maximum value on the X axis (u16). |
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ti,y-max Maximum value on the Y axis (u16). |
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ti,pressure-min Minimum reported pressure value |
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(threshold) - u16. |
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ti,pressure-max Maximum reported pressure value (u16). |
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ti,debounce-max Max number of additional readings per |
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sample (u16). |
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Example for a TSC2046 chip connected to an McSPI controller of an OMAP SoC:: |
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spi_controller { |
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tsc2046@0 { |
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reg = <0>; /* CS0 */ |
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compatible = "ti,tsc2046"; |
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interrupt-parent = <&gpio1>; |
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interrupts = <8 0>; /* BOOT6 / GPIO 8 */ |
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spi-max-frequency = <1000000>; |
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pendown-gpio = <&gpio1 8 0>; |
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vcc-supply = <®_vcc3>; |
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ti,x-min = /bits/ 16 <0>; |
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ti,x-max = /bits/ 16 <8000>; |
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ti,y-min = /bits/ 16 <0>; |
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ti,y-max = /bits/ 16 <4800>; |
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ti,x-plate-ohms = /bits/ 16 <40>; |
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ti,pressure-max = /bits/ 16 <255>; |
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wakeup-source; |
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}; |
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};
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