This patch adds binding documentation for the Azoteq IQS550/572/525
family of trackpad/touchscreen controllers.
Signed-off-by: Jeff LaBundy <jeff@xxxxxxxxxxx>
Reviewed-by: Rob Herring <robh@xxxxxxxxxx>
---
Changes in v6:
- None
Changes in v5:
- None
Changes in v4:
- None
Changes in v3:
- Added Reviewed-by trailer
Changes in v2:
- Separated each valid "compatible" property with a line break
- Specified the polarity of the RDY and NRST pins
- Replaced duplicate definitions of common touchscreen properties with a
reference to touchscreen.txt
- Specified the example node as "touchscreen@74"
.../bindings/input/touchscreen/iqs5xx.txt | 109 +++++++++++++++++++++
.../devicetree/bindings/vendor-prefixes.txt | 1 +
2 files changed, 110 insertions(+)
create mode 100644 Documentation/devicetree/bindings/input/touchscreen/iqs5xx.txt
diff --git a/Documentation/devicetree/bindings/input/touchscreen/iqs5xx.txt b/Documentation/devicetree/bindings/input/touchscreen/iqs5xx.txt
new file mode 100644
index 0000000..25ee2a0
--- /dev/null
+++ b/Documentation/devicetree/bindings/input/touchscreen/iqs5xx.txt
@@ -0,0 +1,109 @@
+Azoteq IQS550/572/525 Trackpad/Touchscreen Controller
+
+Required properties:
+
+- compatible : Must be equal to one of the following:
+ "azoteq,iqs550"
+ "azoteq,iqs572"
+ "azoteq,iqs525"
+
+- reg : I2C slave address for the device.
+
+- interrupts : GPIO to which the device's active-high RDY
+ output is connected (see [0]).
+
+- reset-gpios : GPIO to which the device's active-low NRST
+ input is connected (see [1]). Hardware reset
+ access is required in order to to facilitate
+ in-system firmware replacement.
+
+Optional properties:
+
+- azoteq,exp-ver-major : Major field of the export file version number
+ (0 through 255 inclusive). This property must
+ be specified as a '/bits/ 8' value.
+
+- azoteq,exp-ver-minor : Minor field of the export file version number
+ (0 through 255 inclusive). This property must
+ be specified as a '/bits/ 8' value.
+
+ The export file version number is a customer-
+ assigned parameter embedded in the device's
+ firmware at the time it is exported from the
+ manufacturer's PC-based configuration tool.
+
+ If the export file version number stored in
+ the device's nonvolatile memory does not match
+ the number specified here, the driver replaces
+ the firmware on the device with that which is
+ stored on the local filesystem (for which the
+ export file version number must match).
+
+ If both major and minor fields are omitted or
+ specified as zero, the driver does not query
+ the device's export file version number.
+
+- touchscreen-min-x : See [2].
+
+- touchscreen-min-y : See [2].
+
+- touchscreen-size-x : See [2]. If this property is omitted, the
+ maximum x-coordinate is specified by the
+ device's "X Resolution" register.
+
+- touchscreen-size-y : See [2]. If this property is omitted, the
+ maximum y-coordinate is specified by the
+ device's "Y Resolution" register.
+
+- touchscreen-max-pressure : See [2]. Pressure is expressed as the sum of
+ the deltas across all channels impacted by a
+ touch event. A channel's delta is calculated
+ as its count value minus a reference, where
+ the count value is inversely proportional to
+ the channel's capacitance.
+
+- touchscreen-fuzz-x : See [2].
+
+- touchscreen-fuzz-y : See [2].
+
+- touchscreen-fuzz-pressure : See [2].
+
+- touchscreen-inverted-x : See [2]. Inversion is applied relative to that
+ which may already be specified by the device's
+ FLIP_X and FLIP_Y register fields.
+
+- touchscreen-inverted-y : See [2]. Inversion is applied relative to that
+ which may already be specified by the device's
+ FLIP_X and FLIP_Y register fields.
+
+- touchscreen-swapped-x-y : See [2]. Swapping is applied relative to that
+ which may already be specified by the device's
+ SWITCH_XY_AXIS register fields.
+
+[0]: Documentation/devicetree/bindings/interrupt-controller/interrupts.txt
+[1]: Documentation/devicetree/bindings/gpio/gpio.txt
+[2]: Documentation/devicetree/bindings/input/touchscreen/touchscreen.txt
+
+Example:
+
+ &i2c1 {
+ /* ... */
+
+ touchscreen@74 {
+ compatible = "azoteq,iqs550";
+ reg = <0x74>;
+ interrupt-parent = <&gpio>;
+ interrupts = <17 1>;
+ reset-gpios = <&gpio 27 0>;
+
+ azoteq,exp-ver-major = /bits/ 8 <1>;
+ azoteq,exp-ver-minor = /bits/ 8 <0>;
+
+ touchscreen-size-x = <640>;
+ touchscreen-size-y = <480>;
+
+ touchscreen-max-pressure = <16000>;
+ };
+
+ /* ... */
+ };
diff --git a/Documentation/devicetree/bindings/vendor-prefixes.txt b/Documentation/devicetree/bindings/vendor-prefixes.txt
index 4b1a2a8..51f9954 100644
--- a/Documentation/devicetree/bindings/vendor-prefixes.txt
+++ b/Documentation/devicetree/bindings/vendor-prefixes.txt
@@ -53,6 +53,7 @@ avic Shanghai AVIC Optoelectronics Co., Ltd.
avnet Avnet, Inc.
axentia Axentia Technologies AB
axis Axis Communications AB
+azoteq Azoteq (Pty) Ltd
bananapi BIPAI KEJI LIMITED
bhf Beckhoff Automation GmbH & Co. KG
bitmain Bitmain Technologies
--
2.7.4
