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+# SPDX-License-Identifier: (GPL-2.0 OR BSD-2-Clause)
+%YAML 1.2
+---
+$id: http://devicetree.org/schemas/input/iqs269a.yaml#
+$schema: http://devicetree.org/meta-schemas/core.yaml#
+
+title: Azoteq IQS269A Capacitive Touch Controller
+
+maintainers:
+ - Jeff LaBundy <jeff@labundy.com>
+
+description: |
+ The Azoteq IQS269A is an 8-channel capacitive touch controller that features
+ additional Hall-effect and inductive sensing capabilities.
+
+ Link to datasheet: https://www.azoteq.com/
+
+properties:
+ compatible:
+ const: azoteq,iqs269a
+
+ reg:
+ maxItems: 1
+
+ interrupts:
+ maxItems: 1
+
+ "#address-cells":
+ const: 1
+
+ "#size-cells":
+ const: 0
+
+ azoteq,hall-enable:
+ type: boolean
+ description:
+ Enables Hall-effect sensing on channels 6 and 7. In this case, keycodes
+ assigned to channel 6 are ignored and keycodes assigned to channel 7 are
+ interpreted as switch codes. Refer to the datasheet for requirements im-
+ posed on channels 6 and 7 by Hall-effect sensing.
+
+ azoteq,suspend-mode:
+ allOf:
+ - $ref: /schemas/types.yaml#/definitions/uint32
+ - enum: [0, 1, 2, 3]
+ default: 0
+ description: |
+ Specifies the power mode during suspend as follows:
+ 0: Automatic (same as normal runtime, i.e. suspend/resume disabled)
+ 1: Low power (all sensing at a reduced reporting rate)
+ 2: Ultra-low power (channel 0 proximity sensing)
+ 3: Halt (no sensing)
+
+ azoteq,clk-div:
+ type: boolean
+ description: Divides the device's core clock by a factor of 4.
+
+ azoteq,ulp-update:
+ allOf:
+ - $ref: /schemas/types.yaml#/definitions/uint32
+ - minimum: 0
+ maximum: 7
+ default: 3
+ description: Specifies the ultra-low-power mode update rate.
+
+ azoteq,reseed-offset:
+ type: boolean
+ description:
+ Applies an 8-count offset to all long-term averages upon either ATI or
+ reseed events.
+
+ azoteq,filt-str-lp-lta:
+ allOf:
+ - $ref: /schemas/types.yaml#/definitions/uint32
+ - enum: [0, 1, 2, 3]
+ default: 0
+ description:
+ Specifies the long-term average filter strength during low-power mode.
+
+ azoteq,filt-str-lp-cnt:
+ allOf:
+ - $ref: /schemas/types.yaml#/definitions/uint32
+ - enum: [0, 1, 2, 3]
+ default: 0
+ description:
+ Specifies the raw count filter strength during low-power mode.
+
+ azoteq,filt-str-np-lta:
+ allOf:
+ - $ref: /schemas/types.yaml#/definitions/uint32
+ - enum: [0, 1, 2, 3]
+ default: 0
+ description:
+ Specifies the long-term average filter strength during normal-power mode.
+
+ azoteq,filt-str-np-cnt:
+ allOf:
+ - $ref: /schemas/types.yaml#/definitions/uint32
+ - enum: [0, 1, 2, 3]
+ default: 0
+ description:
+ Specifies the raw count filter strength during normal-power mode.
+
+ azoteq,rate-np-ms:
+ minimum: 0
+ maximum: 255
+ default: 16
+ description: Specifies the report rate (in ms) during normal-power mode.
+
+ azoteq,rate-lp-ms:
+ minimum: 0
+ maximum: 255
+ default: 160
+ description: Specifies the report rate (in ms) during low-power mode.
+
+ azoteq,rate-ulp-ms:
+ multipleOf: 16
+ minimum: 0
+ maximum: 4080
+ default: 160
+ description: Specifies the report rate (in ms) during ultra-low-power mode.
+
+ azoteq,timeout-pwr-ms:
+ multipleOf: 512
+ minimum: 0
+ maximum: 130560
+ default: 2560
+ description:
+ Specifies the length of time (in ms) to wait for an event during normal-
+ power mode before transitioning to low-power mode.
+
+ azoteq,timeout-lta-ms:
+ multipleOf: 512
+ minimum: 0
+ maximum: 130560
+ default: 32768
+ description:
+ Specifies the length of time (in ms) to wait before resetting the long-
+ term average of all channels. Specify the maximum timeout to disable it
+ altogether.
+
+ azoteq,ati-band-disable:
+ type: boolean
+ description: Disables the ATI band check.
+
+ azoteq,ati-lp-only:
+ type: boolean
+ description: Limits automatic ATI to low-power mode.
+
+ azoteq,ati-band-tighten:
+ type: boolean
+ description: Tightens the ATI band from 1/8 to 1/16 of the desired target.
+
+ azoteq,filt-disable:
+ type: boolean
+ description: Disables all raw count filtering.
+
+ azoteq,gpio3-select:
+ allOf:
+ - $ref: /schemas/types.yaml#/definitions/uint32
+ - minimum: 0
+ maximum: 7
+ default: 0
+ description:
+ Selects the channel for which the GPIO3 pin represents touch state.
+
+ azoteq,dual-direction:
+ type: boolean
+ description:
+ Specifies that long-term averages are to freeze in the presence of either
+ increasing or decreasing counts, thereby permitting events to be reported
+ in either direction.
+
+ azoteq,tx-freq:
+ allOf:
+ - $ref: /schemas/types.yaml#/definitions/uint32
+ - enum: [0, 1, 2, 3]
+ default: 0
+ description: |
+ Specifies the inductive sensing excitation frequency as follows (paren-
+ thesized numbers represent the frequency if 'azoteq,clk-div' is present):
+ 0: 16 MHz (4 MHz)
+ 1: 8 MHz (2 MHz)
+ 2: 4 MHz (1 MHz)
+ 3: 2 MHz (500 kHz)
+
+ azoteq,global-cap-increase:
+ type: boolean
+ description: Increases the global capacitance adder from 0.5 pF to 1.5 pF.
+
+ azoteq,reseed-select:
+ allOf:
+ - $ref: /schemas/types.yaml#/definitions/uint32
+ - enum: [0, 1, 2, 3]
+ default: 0
+ description: |
+ Specifies the event(s) that prompt the device to reseed (i.e. reset the
+ long-term average) of an associated channel as follows:
+ 0: None
+ 1: Proximity
+ 2: Proximity or touch
+ 3: Proximity, touch or deep touch
+
+ azoteq,tracking-enable:
+ type: boolean
+ description:
+ Enables all associated channels to track their respective reference
+ channels.
+
+ azoteq,filt-str-slider:
+ allOf:
+ - $ref: /schemas/types.yaml#/definitions/uint32
+ - enum: [0, 1, 2, 3]
+ default: 1
+ description: Specifies the slider coordinate filter strength.
+
+patternProperties:
+ "^channel@[0-7]$":
+ type: object
+ description:
+ Represents a single sensing channel. A channel is active if defined and
+ inactive otherwise.
+
+ properties:
+ reg:
+ minimum: 0
+ maximum: 7
+ description: Index of the channel.
+
+ azoteq,reseed-disable:
+ type: boolean
+ description:
+ Prevents the channel from being reseeded if the long-term average
+ timeout (defined in 'azoteq,timeout-lta') expires.
+
+ azoteq,blocking-enable:
+ type: boolean
+ description: Specifies that the channel is a blocking channel.
+
+ azoteq,slider0-select:
+ type: boolean
+ description: Specifies that the channel participates in slider 0.
+
+ azoteq,slider1-select:
+ type: boolean
+ description: Specifies that the channel participates in slider 1.
+
+ azoteq,rx-enable:
+ allOf:
+ - $ref: /schemas/types.yaml#/definitions/uint32-array
+ - minItems: 1
+ maxItems: 8
+ items:
+ minimum: 0
+ maximum: 7
+ description:
+ Specifies the CRX pin(s) associated with the channel. By default, only
+ the CRX pin corresponding to the channel's index is enabled (e.g. CRX0
+ for channel 0).
+
+ azoteq,tx-enable:
+ allOf:
+ - $ref: /schemas/types.yaml#/definitions/uint32-array
+ - minItems: 1
+ maxItems: 8
+ items:
+ minimum: 0
+ maximum: 7
+ default: [0, 1, 2, 3, 4, 5, 6, 7]
+ description: Specifies the TX pin(s) associated with the channel.
+
+ azoteq,meas-cap-decrease:
+ type: boolean
+ description:
+ Decreases the internal measurement capacitance from 60 pF to 15 pF.
+
+ azoteq,rx-float-inactive:
+ type: boolean
+ description: Floats any inactive CRX pins instead of grounding them.
+
+ azoteq,local-cap-size:
+ allOf:
+ - $ref: /schemas/types.yaml#/definitions/uint32
+ - enum: [0, 1, 2]
+ default: 0
+ description: |
+ Specifies the capacitance to be added to the channel as follows:
+ 0: None
+ 1: Global adder (based on 'azoteq,global-cap-increase')
+ 2: Global adder + 0.5 pF
+
+ azoteq,invert-enable:
+ type: boolean
+ description:
+ Inverts the polarity of the states reported for proximity, touch and
+ deep-touch events relative to their respective thresholds.
+
+ azoteq,proj-bias:
+ allOf:
+ - $ref: /schemas/types.yaml#/definitions/uint32
+ - enum: [0, 1, 2, 3]
+ default: 2
+ description: |
+ Specifies the bias current applied during projected-capacitance
+ sensing as follows:
+ 0: 2.5 uA
+ 1: 5 uA
+ 2: 10 uA
+ 3: 20 uA
+
+ azoteq,sense-mode:
+ allOf:
+ - $ref: /schemas/types.yaml#/definitions/uint32
+ - enum: [0, 1, 9, 14, 15]
+ default: 0
+ description: |
+ Specifies the channel's sensing mode as follows:
+ 0: Self capacitance
+ 1: Projected capacitance
+ 9: Self or mutual inductance
+ 14: Hall effect
+ 15: Temperature
+
+ azoteq,sense-freq:
+ allOf:
+ - $ref: /schemas/types.yaml#/definitions/uint32
+ - enum: [0, 1, 2, 3]
+ default: 1
+ description: |
+ Specifies the channel's sensing frequency as follows (parenthesized
+ numbers represent the frequency if 'azoteq,clk-div' is present):
+ 0: 4 MHz (1 MHz)
+ 1: 2 MHz (500 kHz)
+ 2: 1 MHz (250 kHz)
+ 3: 500 kHz (125 kHz)
+
+ azoteq,static-enable:
+ type: boolean
+ description: Enables the static front-end for the channel.
+
+ azoteq,ati-mode:
+ allOf:
+ - $ref: /schemas/types.yaml#/definitions/uint32
+ - enum: [0, 1, 2, 3]
+ default: 3
+ description: |
+ Specifies the channel's ATI mode as follows:
+ 0: Disabled
+ 1: Semi-partial
+ 2: Partial
+ 3: Full
+
+ azoteq,ati-base:
+ allOf:
+ - $ref: /schemas/types.yaml#/definitions/uint32
+ - enum: [75, 100, 150, 200]
+ default: 100
+ description: Specifies the channel's ATI base.
+
+ azoteq,ati-target:
+ allOf:
+ - $ref: /schemas/types.yaml#/definitions/uint32
+ - multipleOf: 32
+ minimum: 0
+ maximum: 2016
+ default: 512
+ description: Specifies the channel's ATI target.
+
+ azoteq,assoc-select:
+ allOf:
+ - $ref: /schemas/types.yaml#/definitions/uint32-array
+ - minItems: 1
+ maxItems: 8
+ items:
+ minimum: 0
+ maximum: 7
+ description:
+ Specifies the associated channels for which the channel serves as a
+ reference channel. By default, no channels are selected.
+
+ azoteq,assoc-weight:
+ allOf:
+ - $ref: /schemas/types.yaml#/definitions/uint32
+ - minimum: 0
+ maximum: 255
+ default: 0
+ description:
+ Specifies the channel's impact weight if it acts as an associated
+ channel (0 = 0% impact, 255 = 200% impact).
+
+ patternProperties:
+ "^event-prox(-alt)?$":
+ type: object
+ description:
+ Represents a proximity event reported by the channel in response to
+ a decrease in counts. Node names suffixed with '-alt' instead corre-
+ spond to an increase in counts.
+
+ By default, the long-term average tracks an increase in counts such
+ that only events corresponding to a decrease in counts are reported
+ (refer to the datasheet for more information).
+
+ Specify 'azoteq,dual-direction' to freeze the long-term average when
+ the counts increase or decrease such that events of either direction
+ can be reported. Alternatively, specify 'azoteq,invert-enable' to in-
+ vert the polarity of the states reported by the channel.
+
+ Complementary events (e.g. event-touch and event-touch-alt) can both
+ be present and specify different key or switch codes, but not differ-
+ ent thresholds or hysteresis (if applicable).
+
+ properties:
+ azoteq,thresh:
+ allOf:
+ - $ref: /schemas/types.yaml#/definitions/uint32
+ - minimum: 0
+ maximum: 255
+ default: 10
+ description: Specifies the threshold for the event.
+
+ linux,code:
+ $ref: /schemas/types.yaml#/definitions/uint32
+ description: Numeric key or switch code associated with the event.
+
+ additionalProperties: false
+
+ "^event-touch(-alt)?$":
+ type: object
+ description: Represents a touch event reported by the channel.
+
+ properties:
+ azoteq,thresh:
+ allOf:
+ - $ref: /schemas/types.yaml#/definitions/uint32
+ - minimum: 0
+ maximum: 255
+ default: 8
+ description: Specifies the threshold for the event.
+
+ azoteq,hyst:
+ allOf:
+ - $ref: /schemas/types.yaml#/definitions/uint32
+ - minimum: 0
+ maximum: 15
+ default: 4
+ description: Specifies the hysteresis for the event.
+
+ linux,code:
+ $ref: /schemas/types.yaml#/definitions/uint32
+ description: Numeric key or switch code associated with the event.
+
+ additionalProperties: false
+
+ "^event-deep(-alt)?$":
+ type: object
+ description: Represents a deep-touch event reported by the channel.
+
+ properties:
+ azoteq,thresh:
+ allOf:
+ - $ref: /schemas/types.yaml#/definitions/uint32
+ - minimum: 0
+ maximum: 255
+ default: 26
+ description: Specifies the threshold for the event.
+
+ azoteq,hyst:
+ allOf:
+ - $ref: /schemas/types.yaml#/definitions/uint32
+ - minimum: 0
+ maximum: 15
+ default: 0
+ description: Specifies the hysteresis for the event.
+
+ linux,code:
+ $ref: /schemas/types.yaml#/definitions/uint32
+ description: Numeric key or switch code associated with the event.
+
+ additionalProperties: false
+
+ required:
+ - reg
+
+ additionalProperties: false
+
+required:
+ - compatible
+ - reg
+ - interrupts
+ - "#address-cells"
+ - "#size-cells"
+
+additionalProperties: false
+
+examples:
+ - |
+ #include <dt-bindings/input/input.h>
+ #include <dt-bindings/interrupt-controller/irq.h>
+
+ i2c {
+ #address-cells = <1>;
+ #size-cells = <0>;
+
+ iqs269a@44 {
+ #address-cells = <1>;
+ #size-cells = <0>;
+
+ compatible = "azoteq,iqs269a";
+ reg = <0x44>;
+ interrupt-parent = <&gpio>;
+ interrupts = <17 IRQ_TYPE_LEVEL_LOW>;
+
+ azoteq,hall-enable;
+ azoteq,suspend-mode = <2>;
+
+ channel@0 {
+ reg = <0x0>;
+
+ event-prox {
+ linux,code = <KEY_POWER>;
+ };
+ };
+
+ channel@1 {
+ reg = <0x1>;
+ azoteq,slider0-select;
+ };
+
+ channel@2 {
+ reg = <0x2>;
+ azoteq,slider0-select;
+ };
+
+ channel@3 {
+ reg = <0x3>;
+ azoteq,slider0-select;
+ };
+
+ channel@4 {
+ reg = <0x4>;
+ azoteq,slider0-select;
+ };
+
+ channel@5 {
+ reg = <0x5>;
+ azoteq,slider0-select;
+ };
+
+ channel@6 {
+ reg = <0x6>;
+ azoteq,invert-enable;
+ azoteq,static-enable;
+ azoteq,reseed-disable;
+ azoteq,rx-enable = <0>;
+ azoteq,sense-freq = <0x0>;
+ azoteq,sense-mode = <0xE>;
+ azoteq,ati-mode = <0x0>;
+ azoteq,ati-base = <200>;
+ azoteq,ati-target = <320>;
+ };
+
+ channel@7 {
+ reg = <0x7>;
+ azoteq,invert-enable;
+ azoteq,static-enable;
+ azoteq,reseed-disable;
+ azoteq,rx-enable = <0>, <6>;
+ azoteq,sense-freq = <0x0>;
+ azoteq,sense-mode = <0xE>;
+ azoteq,ati-mode = <0x3>;
+ azoteq,ati-base = <200>;
+ azoteq,ati-target = <320>;
+
+ event-touch {
+ linux,code = <SW_LID>;
+ };
+ };
+ };
+ };
+
+...
This patch adds device tree bindings for the Azoteq IQS269A capacitive touch controller. Signed-off-by: Jeff LaBundy <jeff@labundy.com> --- Changes in v2: - Removed '$ref' and 'allOf' from properties with a unit suffix .../devicetree/bindings/input/iqs269a.yaml | 581 +++++++++++++++++++++ 1 file changed, 581 insertions(+) create mode 100644 Documentation/devicetree/bindings/input/iqs269a.yaml -- 2.7.4