201 lines
5.2 KiB
YAML
201 lines
5.2 KiB
YAML
# SPDX-License-Identifier: (GPL-2.0-only OR BSD-2-Clause)
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%YAML 1.2
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---
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$id: http://devicetree.org/schemas/iio/proximity/semtech,sx9324.yaml#
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$schema: http://devicetree.org/meta-schemas/core.yaml#
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title: Semtech's SX9324 capacitive proximity sensor
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maintainers:
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- Gwendal Grignou <gwendal@chromium.org>
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- Daniel Campello <campello@chromium.org>
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description: |
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Semtech's SX9324 proximity sensor.
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properties:
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compatible:
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const: semtech,sx9324
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reg:
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maxItems: 1
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interrupts:
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description:
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Generated by device to announce preceding read request has finished
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and data is available or that a close/far proximity event has happened.
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maxItems: 1
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vdd-supply:
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description: Main power supply
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svdd-supply:
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description: Host interface power supply
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"#io-channel-cells":
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const: 1
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semtech,ph0-pin:
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$ref: /schemas/types.yaml#/definitions/uint32-array
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description: |
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Array of 3 entries. Index represent the id of the CS pin.
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Value indicates how each CS pin is used during phase 0.
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Each of the 3 pins have the following value -
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0 : unused (high impedance)
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1 : measured input
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2 : dynamic shield
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3 : grounded.
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For instance, CS0 measured, CS1 shield and CS2 ground is [1, 2, 3]
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items:
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enum: [ 0, 1, 2, 3 ]
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minItems: 3
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maxItems: 3
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semtech,ph1-pin:
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$ref: /schemas/types.yaml#/definitions/uint32-array
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description: Same as ph0-pin for phase 1.
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items:
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enum: [ 0, 1, 2, 3 ]
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minItems: 3
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maxItems: 3
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semtech,ph2-pin:
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$ref: /schemas/types.yaml#/definitions/uint32-array
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description: Same as ph0-pin for phase 2.
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items:
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enum: [ 0, 1, 2, 3 ]
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minItems: 3
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maxItems: 3
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semtech,ph3-pin:
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$ref: /schemas/types.yaml#/definitions/uint32-array
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description: Same as ph0-pin for phase 3.
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items:
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enum: [ 0, 1, 2, 3 ]
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minItems: 3
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maxItems: 3
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semtech,ph01-resolution:
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$ref: /schemas/types.yaml#/definitions/uint32
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enum: [8, 16, 32, 64, 128, 256, 512, 1024]
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description:
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Capacitance measurement resolution. For phase 0 and 1.
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Higher the number, higher the resolution.
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default: 128
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semtech,ph23-resolution:
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$ref: /schemas/types.yaml#/definitions/uint32
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enum: [8, 16, 32, 64, 128, 256, 512, 1024]
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description:
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Capacitance measurement resolution. For phase 2 and 3
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default: 128
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semtech,startup-sensor:
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$ref: /schemas/types.yaml#/definitions/uint32
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enum: [0, 1, 2, 3]
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default: 0
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description: |
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Phase used for start-up proximity detection.
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It is used when we enable a phase to remove static offset and measure
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only capacitance changes introduced by the user.
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semtech,ph01-proxraw-strength:
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$ref: /schemas/types.yaml#/definitions/uint32
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minimum: 0
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maximum: 7
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default: 1
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description:
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PROXRAW filter strength for phase 0 and 1. A value of 0 represents off,
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and other values represent 1-1/2^N.
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semtech,ph23-proxraw-strength:
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$ref: /schemas/types.yaml#/definitions/uint32
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minimum: 0
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maximum: 7
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default: 1
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description:
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Same as proxraw-strength01, for phase 2 and 3.
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semtech,avg-pos-strength:
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$ref: /schemas/types.yaml#/definitions/uint32
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enum: [0, 16, 64, 128, 256, 512, 1024, 4294967295]
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default: 16
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description: |
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Average positive filter strength. A value of 0 represents off and
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UINT_MAX (4294967295) represents infinite. Other values
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represent 1-1/N.
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semtech,cs-idle-sleep:
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description:
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State of CS pins during sleep mode and idle time.
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enum:
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- hi-z
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- gnd
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- vdd
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semtech,int-comp-resistor:
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description:
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Internal resistor setting for compensation.
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enum:
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- lowest
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- low
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- high
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- highest
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semtech,input-precharge-resistor-ohms:
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default: 4000
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multipleOf: 2000
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minimum: 0
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maximum: 30000
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description:
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Pre-charge input resistance in Ohm.
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semtech,input-analog-gain:
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$ref: /schemas/types.yaml#/definitions/uint32
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minimum: 0
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maximum: 3
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description: |
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Defines the input antenna analog gain
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0: x1.247
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1: x1 (default)
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2: x0.768
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3: x0.552
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required:
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- compatible
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- reg
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- "#io-channel-cells"
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additionalProperties: false
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examples:
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- |
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#include <dt-bindings/interrupt-controller/irq.h>
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i2c {
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#address-cells = <1>;
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#size-cells = <0>;
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proximity@28 {
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compatible = "semtech,sx9324";
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reg = <0x28>;
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interrupt-parent = <&pio>;
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interrupts = <5 IRQ_TYPE_LEVEL_LOW 5>;
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vdd-supply = <&pp3300_a>;
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svdd-supply = <&pp1800_prox>;
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#io-channel-cells = <1>;
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semtech,ph0-pin = <1 2 3>;
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semtech,ph1-pin = <3 2 1>;
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semtech,ph2-pin = <1 2 3>;
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semtech,ph3-pin = <3 2 1>;
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semtech,ph01-resolution = <256>;
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semtech,ph23-resolution = <256>;
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semtech,startup-sensor = <1>;
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semtech,ph01-proxraw-strength = <2>;
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semtech,ph23-proxraw-strength = <2>;
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semtech,avg-pos-strength = <64>;
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semtech,int-comp-resistor = "lowest";
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semtech,input-precharge-resistor-ohms = <2000>;
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semtech,cs-idle-sleep = "gnd";
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};
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};
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