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authorDmitry Torokhov <dmitry.torokhov@gmail.com>2022-01-18 05:03:39 +0300
committerDmitry Torokhov <dmitry.torokhov@gmail.com>2022-01-18 05:03:39 +0300
commit87a0b2fafc09766d8c55461a18345a1cfb10a7fe (patch)
treef2ecd87b34a4709e49b51470056f6b6e528fefca /Documentation/devicetree/bindings/input
parentb6e43dddaea3dbfa93327f986beb3ec5e8157c4c (diff)
parentdf0cc57e057f18e44dac8e6c18aba47ab53202f9 (diff)
downloadlinux-87a0b2fafc09766d8c55461a18345a1cfb10a7fe.tar.xz
Merge tag 'v5.16' into next
Sync up with mainline to bring in the latest API changes.
Diffstat (limited to 'Documentation/devicetree/bindings/input')
-rw-r--r--Documentation/devicetree/bindings/input/cap11xx.txt79
-rw-r--r--Documentation/devicetree/bindings/input/elan,ekth3000.yaml81
-rw-r--r--Documentation/devicetree/bindings/input/elan_i2c.txt44
-rw-r--r--Documentation/devicetree/bindings/input/gpio-keys.yaml2
-rw-r--r--Documentation/devicetree/bindings/input/microchip,cap11xx.yaml149
-rw-r--r--Documentation/devicetree/bindings/input/touchscreen/silead,gsl1680.yaml91
-rw-r--r--Documentation/devicetree/bindings/input/touchscreen/silead_gsl1680.txt44
-rw-r--r--Documentation/devicetree/bindings/input/touchscreen/ti,am3359-tsc.yaml76
-rw-r--r--Documentation/devicetree/bindings/input/touchscreen/ti-tsc-adc.txt91
9 files changed, 398 insertions, 259 deletions
diff --git a/Documentation/devicetree/bindings/input/cap11xx.txt b/Documentation/devicetree/bindings/input/cap11xx.txt
deleted file mode 100644
index 74b91c398d22..000000000000
--- a/Documentation/devicetree/bindings/input/cap11xx.txt
+++ /dev/null
@@ -1,79 +0,0 @@
-Device tree bindings for Microchip CAP11xx based capacitive touch sensors
-
-The node for this device must be a child of a I2C controller node, as the
-device communication via I2C only.
-
-Required properties:
-
- compatible: Must contain one of:
- "microchip,cap1106"
- "microchip,cap1126"
- "microchip,cap1188"
- "microchip,cap1206"
-
- reg: The I2C slave address of the device.
-
- interrupts: Property describing the interrupt line the
- device's ALERT#/CM_IRQ# pin is connected to.
- The device only has one interrupt source.
-
-Optional properties:
-
- autorepeat: Enables the Linux input system's autorepeat
- feature on the input device.
-
- microchip,sensor-gain: Defines the gain of the sensor circuitry. This
- effectively controls the sensitivity, as a
- smaller delta capacitance is required to
- generate the same delta count values.
- Valid values are 1, 2, 4, and 8.
- By default, a gain of 1 is set.
-
- microchip,irq-active-high: By default the interrupt pin is active low
- open drain. This property allows using the active
- high push-pull output.
-
- linux,keycodes: Specifies an array of numeric keycode values to
- be used for the channels. If this property is
- omitted, KEY_A, KEY_B, etc are used as
- defaults. The array must have exactly six
- entries.
-
-Example:
-
-i2c_controller {
- cap1106@28 {
- compatible = "microchip,cap1106";
- interrupt-parent = <&gpio1>;
- interrupts = <0 0>;
- reg = <0x28>;
- autorepeat;
- microchip,sensor-gain = <2>;
-
- linux,keycodes = <103>, /* KEY_UP */
- <106>, /* KEY_RIGHT */
- <108>, /* KEY_DOWN */
- <105>, /* KEY_LEFT */
- <109>, /* KEY_PAGEDOWN */
- <104>; /* KEY_PAGEUP */
-
- #address-cells = <1>;
- #size-cells = <0>;
-
- usr@0 {
- label = "cap11xx:green:usr0";
- reg = <0>;
- };
-
- usr@1 {
- label = "cap11xx:green:usr1";
- reg = <1>;
- };
-
- alive@2 {
- label = "cap11xx:green:alive";
- reg = <2>;
- linux,default_trigger = "heartbeat";
- };
- };
-}
diff --git a/Documentation/devicetree/bindings/input/elan,ekth3000.yaml b/Documentation/devicetree/bindings/input/elan,ekth3000.yaml
new file mode 100644
index 000000000000..2a9bb6ace021
--- /dev/null
+++ b/Documentation/devicetree/bindings/input/elan,ekth3000.yaml
@@ -0,0 +1,81 @@
+# SPDX-License-Identifier: (GPL-2.0-only or BSD-2-Clause)
+%YAML 1.2
+---
+$id: http://devicetree.org/schemas/input/elan,ekth3000.yaml#
+$schema: http://devicetree.org/meta-schemas/core.yaml#
+
+title: Elantech I2C Touchpad
+
+maintainers:
+ - Dmitry Torokhov <dmitry.torokhov@gmail.com>
+
+allOf:
+ - $ref: touchscreen/touchscreen.yaml#
+
+properties:
+ compatible:
+ const: elan,ekth3000
+
+ reg:
+ maxItems: 1
+
+ interrupts:
+ maxItems: 1
+
+ wakeup-source:
+ type: boolean
+ description: touchpad can be used as a wakeup source
+
+ vcc-supply:
+ description: a phandle for the regulator supplying 3.3V power
+
+ elan,trackpoint:
+ type: boolean
+ description: touchpad can support a trackpoint
+
+ elan,clickpad:
+ type: boolean
+ description: touchpad is a clickpad (the entire surface is a button)
+
+ elan,middle-button:
+ type: boolean
+ description: touchpad has a physical middle button
+
+ elan,x_traces:
+ $ref: /schemas/types.yaml#/definitions/uint32
+ description: number of antennas on the x axis
+
+ elan,y_traces:
+ $ref: /schemas/types.yaml#/definitions/uint32
+ description: number of antennas on the y axis
+
+ touchscreen-size-x: true
+
+ touchscreen-size-y: true
+
+ touchscreen-x-mm: true
+
+ touchscreen-y-mm: true
+
+required:
+ - compatible
+ - reg
+ - interrupts
+
+additionalProperties: false
+
+examples:
+ - |
+ #include <dt-bindings/interrupt-controller/irq.h>
+ i2c {
+ #address-cells = <1>;
+ #size-cells = <0>;
+
+ touchpad@15 {
+ compatible = "elan,ekth3000";
+ reg = <0x15>;
+ interrupt-parent = <&gpio4>;
+ interrupts = <0x0 IRQ_TYPE_EDGE_FALLING>;
+ wakeup-source;
+ };
+ };
diff --git a/Documentation/devicetree/bindings/input/elan_i2c.txt b/Documentation/devicetree/bindings/input/elan_i2c.txt
deleted file mode 100644
index 9963247706f2..000000000000
--- a/Documentation/devicetree/bindings/input/elan_i2c.txt
+++ /dev/null
@@ -1,44 +0,0 @@
-Elantech I2C Touchpad
-
-Required properties:
-- compatible: must be "elan,ekth3000".
-- reg: I2C address of the chip.
-- interrupts: interrupt to which the chip is connected (see interrupt
- binding[0]).
-
-Optional properties:
-- wakeup-source: touchpad can be used as a wakeup source.
-- pinctrl-names: should be "default" (see pinctrl binding [1]).
-- pinctrl-0: a phandle pointing to the pin settings for the device (see
- pinctrl binding [1]).
-- vcc-supply: a phandle for the regulator supplying 3.3V power.
-- elan,trackpoint: touchpad can support a trackpoint (boolean)
-- elan,clickpad: touchpad is a clickpad (the entire surface is a button)
-- elan,middle-button: touchpad has a physical middle button
-- elan,x_traces: number of antennas on the x axis
-- elan,y_traces: number of antennas on the y axis
-- some generic touchscreen properties [2]:
- * touchscreen-size-x
- * touchscreen-size-y
- * touchscreen-x-mm
- * touchscreen-y-mm
-
-
-[0]: Documentation/devicetree/bindings/interrupt-controller/interrupts.txt
-[1]: Documentation/devicetree/bindings/pinctrl/pinctrl-bindings.txt
-[2]: Documentation/devicetree/bindings/input/touchscreen/touchscreen.txt
-
-Example:
- &i2c1 {
- /* ... */
-
- touchpad@15 {
- compatible = "elan,ekth3000";
- reg = <0x15>;
- interrupt-parent = <&gpio4>;
- interrupts = <0x0 IRQ_TYPE_EDGE_FALLING>;
- wakeup-source;
- };
-
- /* ... */
- };
diff --git a/Documentation/devicetree/bindings/input/gpio-keys.yaml b/Documentation/devicetree/bindings/input/gpio-keys.yaml
index 060a309ff8e7..dbe7ecc19ccb 100644
--- a/Documentation/devicetree/bindings/input/gpio-keys.yaml
+++ b/Documentation/devicetree/bindings/input/gpio-keys.yaml
@@ -142,7 +142,7 @@ examples:
down {
label = "GPIO Key DOWN";
linux,code = <108>;
- interrupts = <1 IRQ_TYPE_LEVEL_HIGH 7>;
+ interrupts = <1 IRQ_TYPE_EDGE_FALLING>;
};
};
diff --git a/Documentation/devicetree/bindings/input/microchip,cap11xx.yaml b/Documentation/devicetree/bindings/input/microchip,cap11xx.yaml
new file mode 100644
index 000000000000..d5d6bced3148
--- /dev/null
+++ b/Documentation/devicetree/bindings/input/microchip,cap11xx.yaml
@@ -0,0 +1,149 @@
+# SPDX-License-Identifier: (GPL-2.0 OR BSD-2-Clause)
+%YAML 1.2
+---
+$id: "http://devicetree.org/schemas/input/microchip,cap11xx.yaml#"
+$schema: "http://devicetree.org/meta-schemas/core.yaml#"
+
+title: Device tree bindings for Microchip CAP11xx based capacitive touch sensors
+
+description: |
+ The Microchip CAP1xxx Family of RightTouchTM multiple-channel capacitive
+ touch controllers and LED drivers. The device communication via I2C only.
+
+maintainers:
+ - Rob Herring <robh@kernel.org>
+
+properties:
+ compatible:
+ enum:
+ - microchip,cap1106
+ - microchip,cap1126
+ - microchip,cap1188
+ - microchip,cap1206
+
+ reg:
+ maxItems: 1
+
+ '#address-cells':
+ const: 1
+
+ '#size-cells':
+ const: 0
+
+ interrupts:
+ maxItems: 1
+ description: |
+ Property describing the interrupt line the
+ device's ALERT#/CM_IRQ# pin is connected to.
+ The device only has one interrupt source.
+
+ autorepeat:
+ description: |
+ Enables the Linux input system's autorepeat feature on the input device.
+
+ linux,keycodes:
+ minItems: 6
+ maxItems: 6
+ description: |
+ Specifies an array of numeric keycode values to
+ be used for the channels. If this property is
+ omitted, KEY_A, KEY_B, etc are used as defaults.
+ The array must have exactly six entries.
+
+ microchip,sensor-gain:
+ $ref: /schemas/types.yaml#/definitions/uint32
+ default: 1
+ enum: [1, 2, 4, 8]
+ description: |
+ Defines the gain of the sensor circuitry. This
+ effectively controls the sensitivity, as a
+ smaller delta capacitance is required to
+ generate the same delta count values.
+
+ microchip,irq-active-high:
+ type: boolean
+ description: |
+ By default the interrupt pin is active low
+ open drain. This property allows using the active
+ high push-pull output.
+
+patternProperties:
+ "^led@[0-7]$":
+ type: object
+ description: CAP11xx LEDs
+ $ref: /schemas/leds/common.yaml#
+
+ properties:
+ reg:
+ enum: [0, 1, 2, 3, 4, 5, 6, 7]
+
+ label: true
+
+ linux,default-trigger: true
+
+ default-state: true
+
+ required:
+ - reg
+
+ additionalProperties: false
+
+allOf:
+ - $ref: input.yaml
+ - if:
+ properties:
+ compatible:
+ contains:
+ enum:
+ - microchip,cap1106
+ then:
+ patternProperties:
+ "^led@[0-7]$": false
+
+required:
+ - compatible
+ - interrupts
+
+additionalProperties: false
+
+examples:
+ - |
+ i2c {
+ #address-cells = <1>;
+ #size-cells = <0>;
+
+ cap1188@28 {
+ compatible = "microchip,cap1188";
+ interrupt-parent = <&gpio1>;
+ interrupts = <0 0>;
+ reg = <0x28>;
+ autorepeat;
+ microchip,sensor-gain = <2>;
+
+ linux,keycodes = <103>, /* KEY_UP */
+ <106>, /* KEY_RIGHT */
+ <108>, /* KEY_DOWN */
+ <105>, /* KEY_LEFT */
+ <109>, /* KEY_PAGEDOWN */
+ <104>; /* KEY_PAGEUP */
+
+ #address-cells = <1>;
+ #size-cells = <0>;
+
+ led@0 {
+ label = "cap11xx:green:usr0";
+ reg = <0>;
+ };
+
+ led@1 {
+ label = "cap11xx:green:usr1";
+ reg = <1>;
+ };
+
+ led@2 {
+ label = "cap11xx:green:alive";
+ reg = <2>;
+ linux,default-trigger = "heartbeat";
+ };
+ };
+ };
diff --git a/Documentation/devicetree/bindings/input/touchscreen/silead,gsl1680.yaml b/Documentation/devicetree/bindings/input/touchscreen/silead,gsl1680.yaml
new file mode 100644
index 000000000000..eec6f7f6f0a3
--- /dev/null
+++ b/Documentation/devicetree/bindings/input/touchscreen/silead,gsl1680.yaml
@@ -0,0 +1,91 @@
+# SPDX-License-Identifier: GPL-2.0
+%YAML 1.2
+---
+$id: http://devicetree.org/schemas/input/touchscreen/silead,gsl1680.yaml#
+$schema: http://devicetree.org/meta-schemas/core.yaml#
+
+title: Silead GSL1680 Touchscreen Controller Device Tree Bindings
+
+maintainers:
+ - Dmitry Torokhov <dmitry.torokhov@gmail.com>
+
+allOf:
+ - $ref: touchscreen.yaml#
+
+properties:
+ compatible:
+ enum:
+ - silead,gsl1680
+ - silead,gsl1688
+ - silead,gsl3670
+ - silead,gsl3675
+ - silead,gsl3692
+
+ reg:
+ maxItems: 1
+
+ interrupts:
+ maxItems: 1
+
+ power-gpios:
+ maxItems: 1
+
+ firmware-name:
+ $ref: /schemas/types.yaml#/definitions/string
+ description: >
+ File basename for board specific firmware
+
+ silead,max-fingers:
+ $ref: /schemas/types.yaml#/definitions/uint32
+ maximum: 5
+ description: >
+ Maximum number of fingers the touchscreen can detect
+
+ silead,home-button:
+ type: boolean
+ description: >
+ Does the device have a capacitive home-button build into the
+ touchscreen?
+
+ avdd-supply:
+ description: >
+ Regulator phandle for controller AVDD
+
+ vddio-supply:
+ description: >
+ Regulator phandle for controller VDDIO
+
+unevaluatedProperties: false
+
+required:
+ - compatible
+ - reg
+ - interrupts
+ - power-gpios
+ - touchscreen-size-x
+ - touchscreen-size-y
+
+examples:
+ - |
+ #include <dt-bindings/gpio/gpio.h>
+ #include <dt-bindings/interrupt-controller/arm-gic.h>
+
+ i2c {
+ #address-cells = <1>;
+ #size-cells = <0>;
+
+ touchscreen@40 {
+ compatible = "silead,gsl1680";
+ reg = <0x40>;
+ interrupt-parent = <&pio>;
+ interrupts = <6 11 IRQ_TYPE_EDGE_FALLING>;
+ power-gpios = <&pio 1 3 GPIO_ACTIVE_HIGH>;
+ touchscreen-size-x = <480>;
+ touchscreen-size-y = <800>;
+ touchscreen-inverted-x;
+ touchscreen-swapped-x-y;
+ silead,max-fingers = <5>;
+ };
+ };
+
+...
diff --git a/Documentation/devicetree/bindings/input/touchscreen/silead_gsl1680.txt b/Documentation/devicetree/bindings/input/touchscreen/silead_gsl1680.txt
deleted file mode 100644
index d67e558e5ab5..000000000000
--- a/Documentation/devicetree/bindings/input/touchscreen/silead_gsl1680.txt
+++ /dev/null
@@ -1,44 +0,0 @@
-* GSL 1680 touchscreen controller
-
-Required properties:
-- compatible : Must be one of the following, depending on the model:
- "silead,gsl1680"
- "silead,gsl1688"
- "silead,gsl3670"
- "silead,gsl3675"
- "silead,gsl3692"
-- reg : I2C slave address of the chip (0x40)
-- interrupts : interrupt specification for the gsl1680 interrupt
-- power-gpios : Specification for the pin connected to the gsl1680's
- shutdown input. This needs to be driven high to take the
- gsl1680 out of its low power state
-- touchscreen-size-x : See touchscreen.txt
-- touchscreen-size-y : See touchscreen.txt
-
-Optional properties:
-- firmware-name : File basename (string) for board specific firmware
-- touchscreen-inverted-x : See touchscreen.txt
-- touchscreen-inverted-y : See touchscreen.txt
-- touchscreen-swapped-x-y : See touchscreen.txt
-- silead,max-fingers : maximum number of fingers the touchscreen can detect
-- silead,home-button : Boolean, set to true on devices which have a
- capacitive home-button build into the touchscreen
-- vddio-supply : regulator phandle for controller VDDIO
-- avdd-supply : regulator phandle for controller AVDD
-
-Example:
-
-i2c@00000000 {
- gsl1680: touchscreen@40 {
- compatible = "silead,gsl1680";
- reg = <0x40>;
- interrupt-parent = <&pio>;
- interrupts = <6 11 IRQ_TYPE_EDGE_FALLING>;
- power-gpios = <&pio 1 3 GPIO_ACTIVE_HIGH>;
- touchscreen-size-x = <480>;
- touchscreen-size-y = <800>;
- touchscreen-inverted-x;
- touchscreen-swapped-x-y;
- silead,max-fingers = <5>;
- };
-};
diff --git a/Documentation/devicetree/bindings/input/touchscreen/ti,am3359-tsc.yaml b/Documentation/devicetree/bindings/input/touchscreen/ti,am3359-tsc.yaml
new file mode 100644
index 000000000000..e44cc65abc8c
--- /dev/null
+++ b/Documentation/devicetree/bindings/input/touchscreen/ti,am3359-tsc.yaml
@@ -0,0 +1,76 @@
+# SPDX-License-Identifier: (GPL-2.0-only OR BSD-2-Clause)
+%YAML 1.2
+---
+$id: http://devicetree.org/schemas/input/touchscreen/ti,am3359-tsc.yaml#
+$schema: http://devicetree.org/meta-schemas/core.yaml#
+
+title: TI AM3359 Touchscreen controller
+
+maintainers:
+ - Miquel Raynal <miquel.raynal@bootlin.com>
+
+properties:
+ compatible:
+ const: ti,am3359-tsc
+
+ ti,wires:
+ description: Wires refer to application modes i.e. 4/5/8 wire touchscreen
+ support on the platform.
+ $ref: /schemas/types.yaml#/definitions/uint32
+ enum: [4, 5, 8]
+
+ ti,x-plate-resistance:
+ description: X plate resistance
+ $ref: /schemas/types.yaml#/definitions/uint32
+
+ ti,coordinate-readouts:
+ description: The sequencer supports a total of 16 programmable steps. Each
+ step is used to read a single coordinate. A single readout is enough but
+ multiple reads can increase the quality. A value of 5 means, 5 reads for
+ X, 5 for Y and 2 for Z (always). This utilises 12 of the 16 software steps
+ available. The remaining 4 can be used by the ADC.
+ $ref: /schemas/types.yaml#/definitions/uint32
+ minimum: 1
+ maximum: 6
+
+ ti,wire-config:
+ description: Different boards could have a different order for connecting
+ wires on touchscreen. We need to provide an 8-bit number where the
+ first four bits represent the analog lines and the next 4 bits represent
+ positive/negative terminal on that input line. Notations to represent the
+ input lines and terminals respectively are as follows, AIN0 = 0, AIN1 = 1
+ and so on until AIN7 = 7. XP = 0, XN = 1, YP = 2, YN = 3.
+ $ref: /schemas/types.yaml#/definitions/uint32-array
+ minItems: 4
+ maxItems: 8
+
+ ti,charge-delay:
+ description: Length of touch screen charge delay step in terms of ADC clock
+ cycles. Charge delay value should be large in order to avoid false pen-up
+ events. This value effects the overall sampling speed, hence need to be
+ kept as low as possible, while avoiding false pen-up event. Start from a
+ lower value, say 0x400, and increase value until false pen-up events are
+ avoided. The pen-up detection happens immediately after the charge step,
+ so this does in fact function as a hardware knob for adjusting the amount
+ of "settling time".
+ $ref: /schemas/types.yaml#/definitions/uint32
+
+required:
+ - compatible
+ - ti,wires
+ - ti,x-plate-resistance
+ - ti,coordinate-readouts
+ - ti,wire-config
+
+additionalProperties: false
+
+examples:
+ - |
+ tsc {
+ compatible = "ti,am3359-tsc";
+ ti,wires = <4>;
+ ti,x-plate-resistance = <200>;
+ ti,coordinate-readouts = <5>;
+ ti,wire-config = <0x00 0x11 0x22 0x33>;
+ ti,charge-delay = <0x400>;
+ };
diff --git a/Documentation/devicetree/bindings/input/touchscreen/ti-tsc-adc.txt b/Documentation/devicetree/bindings/input/touchscreen/ti-tsc-adc.txt
deleted file mode 100644
index aad5e34965eb..000000000000
--- a/Documentation/devicetree/bindings/input/touchscreen/ti-tsc-adc.txt
+++ /dev/null
@@ -1,91 +0,0 @@
-* TI - TSC ADC (Touschscreen and analog digital converter)
-~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
-
-Required properties:
-- mfd
- compatible: Should be
- "ti,am3359-tscadc" for AM335x/AM437x SoCs
- "ti,am654-tscadc", "ti,am3359-tscadc" for AM654 SoCs
-- child "tsc"
- compatible: Should be "ti,am3359-tsc".
- ti,wires: Wires refer to application modes i.e. 4/5/8 wire touchscreen
- support on the platform.
- ti,x-plate-resistance: X plate resistance
- ti,coordinate-readouts: The sequencer supports a total of 16
- programmable steps each step is used to
- read a single coordinate. A single
- readout is enough but multiple reads can
- increase the quality.
- A value of 5 means, 5 reads for X, 5 for
- Y and 2 for Z (always). This utilises 12
- of the 16 software steps available. The
- remaining 4 can be used by the ADC.
- ti,wire-config: Different boards could have a different order for
- connecting wires on touchscreen. We need to provide an
- 8 bit number where in the 1st four bits represent the
- analog lines and the next 4 bits represent positive/
- negative terminal on that input line. Notations to
- represent the input lines and terminals resoectively
- is as follows:
- AIN0 = 0, AIN1 = 1 and so on till AIN7 = 7.
- XP = 0, XN = 1, YP = 2, YN = 3.
-- child "adc"
- compatible: Should be
- "ti,am3359-adc" for AM335x/AM437x SoCs
- "ti,am654-adc", "ti,am3359-adc" for AM654 SoCs
- ti,adc-channels: List of analog inputs available for ADC.
- AIN0 = 0, AIN1 = 1 and so on till AIN7 = 7.
-
-Optional properties:
-- child "tsc"
- ti,charge-delay: Length of touch screen charge delay step in terms of
- ADC clock cycles. Charge delay value should be large
- in order to avoid false pen-up events. This value
- effects the overall sampling speed, hence need to be
- kept as low as possible, while avoiding false pen-up
- event. Start from a lower value, say 0x400, and
- increase value until false pen-up events are avoided.
- The pen-up detection happens immediately after the
- charge step, so this does in fact function as a
- hardware knob for adjusting the amount of "settling
- time".
-
-- child "adc"
- ti,chan-step-opendelay: List of open delays for each channel of
- ADC in the order of ti,adc-channels. The
- value corresponds to the number of ADC
- clock cycles to wait after applying the
- step configuration registers and before
- sending the start of ADC conversion.
- Maximum value is 0x3FFFF.
- ti,chan-step-sampledelay: List of sample delays for each channel
- of ADC in the order of ti,adc-channels.
- The value corresponds to the number of
- ADC clock cycles to sample (to hold
- start of conversion high).
- Maximum value is 0xFF.
- ti,chan-step-avg: Number of averages to be performed for each
- channel of ADC. If average is 16 then input
- is sampled 16 times and averaged to get more
- accurate value. This increases the time taken
- by ADC to generate a sample. Valid range is 0
- average to 16 averages. Maximum value is 16.
-
-Example:
- tscadc: tscadc@44e0d000 {
- compatible = "ti,am3359-tscadc";
- tsc {
- ti,wires = <4>;
- ti,x-plate-resistance = <200>;
- ti,coordiante-readouts = <5>;
- ti,wire-config = <0x00 0x11 0x22 0x33>;
- ti,charge-delay = <0x400>;
- };
-
- adc {
- ti,adc-channels = <4 5 6 7>;
- ti,chan-step-opendelay = <0x098 0x3ffff 0x098 0x0>;
- ti,chan-step-sampledelay = <0xff 0x0 0xf 0x0>;
- ti,chan-step-avg = <16 2 4 8>;
- };
- }