[PATCH v4 1/2] dt-bindings: iio: adc: ti,ads112c04: Add binding for ADS112C04

[Kyle Hsieh <kylehsieh1995@gmail.com>]

Add device tree binding documentation for Texas Instruments ADS112C04
I2C Analog-to-Digital Converters.

These devices provide 4-channel, 16-bit delta-sigma ADCs with an I2C
interface, programmable gain amplifier (PGA), and data-ready (DRDY)
interrupt output.

The binding uses child nodes to dynamically define the connected
single-ended or differential channels.

Excitation current, burn-out current, and reference source properties
are also included to fully describe the chip's hardware capabilities,
aligned with the ti,ads112c14 binding conventions.

Signed-off-by: Kyle Hsieh <kylehsieh1995@gmail.com>
---
 .../devicetree/bindings/iio/adc/ti,ads112c04.yaml  | 148 +++++++++++++++++++++
 MAINTAINERS                                        |   6 +
 2 files changed, 154 insertions(+)

diff --git a/Documentation/devicetree/bindings/iio/adc/ti,ads112c04.yaml b/Documentation/devicetree/bindings/iio/adc/ti,ads112c04.yaml
new file mode 100644
index 000000000000..68a0df21cedd
--- /dev/null
+++ b/Documentation/devicetree/bindings/iio/adc/ti,ads112c04.yaml
@@ -0,0 +1,148 @@
+# SPDX-License-Identifier: (GPL-2.0-only OR BSD-2-Clause)
+%YAML 1.2
+---
+$id: http://devicetree.org/schemas/iio/adc/ti,ads112c04.yaml#
+$schema: http://devicetree.org/meta-schemas/core.yaml#
+
+title: Texas Instruments ADS112C04 ADC
+
+maintainers:
+  - Kyle Hsieh <kylehsieh1995@gmail.com>
+
+description:
+  The ADS112C04 (16-bit) are precision analog-to-digital converters (ADCs)
+  with an I2C interface. They feature a flexible input multiplexer, a
+  low-noise programmable gain amplifier (PGA), two programmable excitation
+  current sources, a voltage reference, and a precision temperature sensor.
+
+properties:
+  compatible:
+    enum:
+      - ti,ads112c04
+
+  reg:
+    maxItems: 1
+    description: I2C address of the device.
+
+  interrupts:
+    maxItems: 1
+    description: Data ready (DRDY) interrupt output.
+
+  "#address-cells":
+    const: 1
+
+  "#size-cells":
+    const: 0
+
+  reset-gpios:
+    maxItems: 1
+    description: GPIO connected to the RESET pin. Active low.
+
+  avdd-supply: true
+  dvdd-supply: true
+
+  refp-supply: true
+  refn-supply: true
+
+  ti,refp-refn-resistor-ohms:
+    description: Resistance of the external resistor between REFP and REFN.
+
+patternProperties:
+  "^channel@[0-9a-b]$":
+    $ref: adc.yaml
+    unevaluatedProperties: false
+    properties:
+      reg:
+        items:
+          - maximum: 11
+
+      single-channel:
+        maximum: 3
+
+      diff-channels:
+        items:
+          maximum: 3
+
+      excitation-channels:
+        maxItems: 2
+        items:
+          maximum: 5
+        description:
+          Additionally to AIN0-AIN3, IDAC1/IDAC2 can also be routed to
+          REFP0 (4) and REFN0 (5).
+
+      excitation-current-nanoamp:
+        items:
+          - enum: [10000, 50000, 100000, 250000, 500000, 1000000, 1500000]
+
+      burn-out-current-nanoamp:
+        items:
+          - const: 10000
+
+      reference-sources:
+        items:
+          - enum: [internal, external, avdd]
+            default: internal
+
+    dependencies:
+      excitation-channels: [ excitation-current-nanoamp ]
+      excitation-current-nanoamp: [ excitation-channels ]
+
+    oneOf:
+      - required: [ single-channel ]
+      - required: [ diff-channels ]
+
+required:
+  - compatible
+  - reg
+  - avdd-supply
+  - dvdd-supply
+
+dependencies:
+  refn-supply: [ refp-supply ]
+
+oneOf:
+  - required:
+      - refp-supply
+  - required:
+      - ti,refp-refn-resistor-ohms
+  - properties:
+      refp-supply: false
+      refn-supply: false
+      ti,refp-refn-resistor-ohms: false
+
+unevaluatedProperties: false
+
+examples:
+  - |
+    #include <dt-bindings/interrupt-controller/irq.h>
+    #include <dt-bindings/gpio/gpio.h>
+    i2c {
+        #address-cells = <1>;
+        #size-cells = <0>;
+
+        adc@40 {
+            compatible = "ti,ads112c04";
+            reg = <0x40>;
+            interrupt-parent = <&gpio>;
+            interrupts = <12 IRQ_TYPE_EDGE_FALLING>;
+
+            reset-gpios = <&gpio 13 GPIO_ACTIVE_LOW>;
+            avdd-supply = <&vdd_3v3_reg>;
+            dvdd-supply = <&vdd_3v3_reg>;
+            refp-supply = <&vref_reg>;
+
+            #address-cells = <1>;
+            #size-cells = <0>;
+
+            channel@0 {
+                reg = <0>;
+                diff-channels = <0>, <1>;
+            };
+
+            channel@1 {
+                reg = <1>;
+                single-channel = <2>;
+            };
+        };
+    };
diff --git a/MAINTAINERS b/MAINTAINERS
index 04fa5322d9f7..417d74b6d6cc 100644
--- a/MAINTAINERS
+++ b/MAINTAINERS
@@ -26987,6 +26987,12 @@ S:	Maintained
 F:	Documentation/devicetree/bindings/iio/adc/ti,ads1119.yaml
 F:	drivers/iio/adc/ti-ads1119.c
 
+TI ADS112C04 ADC DRIVER
+M:	Kyle Hsieh <kylehsieh1995@gmail.com>
+L:	linux-iio@vger.kernel.org
+S:	Maintained
+F:	Documentation/devicetree/bindings/iio/adc/ti,ads112c04.yaml
+
 TI ADS112C14 ADC DRIVER
 M:	David Lechner <dlechner@baylibre.com>
 L:	linux-iio@vger.kernel.org

-- 
2.34.1