st,stmpe811 (on i2c bus)

Vendor: STMicroelectronics

Note

An implementation of a driver matching this compatible is available in drivers/input/input_stmpe811.c.

Description

STMPE811 I2C touchscreen controller

Properties

Node specific propertiesDeprecated node specific propertiesBase properties

Properties not inherited from the base binding file.

Name	Type	Details
int-gpios	phandle-array	Interrupt GPIO. Used by the controller to signal touch data is available. Active low.
raw-x-min	int	Signed raw X axis start for scaling the reported coordinates. No effect if screen size is not set.
raw-y-min	int	Signed raw Y axis start for scaling the reported coordinates. No effect if screen size is not set.
raw-x-max	int	Raw X axis end for scaling the reported coordinates. No effect if screen size is not set.
raw-y-max	int	Raw Y axis end for scaling the reported coordinates. No effect if screen size is not set.
panel-driver-settling-time-us	int	Panel driver settling time (microseconds). For large panels (> 6"), a capacitor of 10 nF is recommended at the touchscreen terminals for noise filtering. As a general rule, 1-5 nF capacitors require around 500 us settling time, and 5-10 nF need around 1 ms. When a larger capacitor is used, this value should be changed, as it can lead to inaccuracy of the measurement. This property is required. Legal values: 10, 100, 500, 1000, 5000, 10000, 50000, 100000
touch-detect-delay-us	int	Touch detect delay (microseconds) is the delay from the activation of the pull-up resistor in the X+ line to the time the device performs touch detection. If no capacitor, or a smaller capacitor is used, this value can be lowered to minimize detection latency, but it could lower the position stability. This property is required. Legal values: 10, 50, 100, 500, 1000, 5000, 10000, 50000
touch-average-control	int	Average control (number of samples). This parameter can be set to any of the possible values. Higher values result in more filtering of noise, but also introduce more latency in the touch detection process. Use cases that require low touch detection latency may benefit from using a lower value for this parameter, at the cost of less noise filtering. This property is required. Legal values: 1, 2, 4, 8
tracking-index	int	Tracking index determines the minimal distance between the current touch position and the previous touch position. If the distance is shorter than the tracking index, it is discarded. Lowering the tracking index increases the frequency of touch events, but also increases the load on the system. This property is required. Legal values: 0, 4, 8, 16, 32, 64, 92, 127
supply-gpios	phandle-array	GPIO specifier that controls power to the device. This property should be provided when the device has a dedicated switch that controls power to the device. The supply state is entirely the responsibility of the device driver. Contrast with vin-supply.
vin-supply	phandle	Reference to the regulator that controls power to the device. The referenced devicetree node must have a regulator compatible. This property should be provided when device power is supplied by a shared regulator. The supply state is dependent on the request status of all devices fed by the regulator. Contrast with supply-gpios. If both properties are provided then the regulator must be requested before the supply GPIOS is set to an active state, and the supply GPIOS must be set to an inactive state before releasing the regulator.
screen-width	int	Horizontal resolution of touchscreen (maximum x coordinate reported + 1). The default corresponds to a valid value for non-inverted axis, required for a display with an inverted x axis.
screen-height	int	Vertical resolution of touchscreen (maximum y coordinate reported + 1). The default corresponds to a valid value for non-inverted axis, required for a display with an inverted y axis.
inverted-x	boolean	X axis is inverted.
inverted-y	boolean	Y axis is inverted.
swapped-x-y	boolean	X and Y axis are swapped. Swapping is done after inverting the axis.