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