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109 lines
2.5 KiB
109 lines
2.5 KiB
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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