STMPE Touchscreen
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----------------
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Required properties:
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- compatible: "st,stmpe-ts"
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Optional properties:
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- st,ave-ctrl : Sample average control
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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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- st,touch-det-delay : Touch detect interrupt delay (recommended is 3)
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0 -> 10 us
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1 -> 50 us
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2 -> 100 us
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3 -> 500 us
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4 -> 1 ms
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5 -> 5 ms
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6 -> 10 ms
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7 -> 50 ms
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- st,settling : Panel driver settling time (recommended is 2)
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0 -> 10 us
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1 -> 100 us
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2 -> 500 us
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3 -> 1 ms
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4 -> 5 ms
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5 -> 10 ms
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6 -> 50 ms
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7 -> 100 ms
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- st,fraction-z : Length of the fractional part in z (recommended is 7)
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(fraction-z ([0..7]) = Count of the fractional part)
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- st,i-drive : current limit value of the touchscreen drivers
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0 -> 20 mA (typical 35mA max)
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1 -> 50 mA (typical 80 mA max)
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Optional properties common with MFD (deprecated):
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- st,sample-time : ADC conversion time in number of clock.
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0 -> 36 clocks
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1 -> 44 clocks
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2 -> 56 clocks
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3 -> 64 clocks
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4 -> 80 clocks (recommended)
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5 -> 96 clocks
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6 -> 124 clocks
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- st,mod-12b : ADC Bit mode
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0 -> 10bit ADC
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1 -> 12bit ADC
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- st,ref-sel : ADC reference source
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0 -> internal
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1 -> external
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- st,adc-freq : ADC Clock speed
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0 -> 1.625 MHz
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1 -> 3.25 MHz
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2 || 3 -> 6.5 MHz
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Node name must be stmpe_touchscreen and should be child node of stmpe node to
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which it belongs.
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Note that common ADC settings of stmpe_touchscreen (child) will take precedence
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over the settings done in MFD.
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Example:
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stmpe811@41 {
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compatible = "st,stmpe811";
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pinctrl-names = "default";
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pinctrl-0 = <&pinctrl_touch_int>;
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#address-cells = <1>;
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#size-cells = <0>;
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reg = <0x41>;
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interrupts = <10 IRQ_TYPE_LEVEL_LOW>;
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interrupt-parent = <&gpio4>;
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interrupt-controller;
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id = <0>;
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blocks = <0x5>;
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irq-trigger = <0x1>;
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/* Common ADC settings */
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/* 3.25 MHz ADC clock speed */
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st,adc-freq = <1>;
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/* 12-bit ADC */
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st,mod-12b = <1>;
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/* internal ADC reference */
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st,ref-sel = <0>;
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/* ADC converstion time: 80 clocks */
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st,sample-time = <4>;
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stmpe_touchscreen {
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compatible = "st,stmpe-ts";
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reg = <0>;
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/* 8 sample average control */
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st,ave-ctrl = <3>;
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/* 5 ms touch detect interrupt delay */
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st,touch-det-delay = <5>;
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/* 1 ms panel driver settling time */
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st,settling = <3>;
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/* 7 length fractional part in z */
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st,fraction-z = <7>;
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/*
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* 50 mA typical 80 mA max touchscreen drivers
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* current limit value
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*/
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st,i-drive = <1>;
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};
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stmpe_adc {
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compatible = "st,stmpe-adc";
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st,norequest-mask = <0x0F>;
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};
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};
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