dt-bindings: iio: adc: Introduce ADS7138

Add documentation for the driver of ADS7128 and ADS7138 12-bit, 8-channel
analog-to-digital converters. These ADCs have a wide operating range and
a wide feature set. Communication is based on the I2C interface.
ADS7128 differs in the addition of further hardware features, like a
root-mean-square (RMS) and a zero-crossing-detect (ZCD) module.

Reviewed-by: Krzysztof Kozlowski <krzysztof.kozlowski@linaro.org>
Signed-off-by: Tobias Sperling <tobias.sperling@softing.com>
Link: https://patch.msgid.link/20250213-adc_ml-v4-1-66b68f8fdb8c@softing.com
Signed-off-by: Jonathan Cameron <Jonathan.Cameron@huawei.com>

1 files changed, 63 insertions, 0 deletions

diff --git a/Documentation/devicetree/bindings/iio/adc/ti,ads7138.yaml b/Documentation/devicetree/bindings/iio/adc/ti,ads7138.yaml
new file mode 100644
index 000000000000..a51893e207d4
--- /dev/null
+++ b/Documentation/devicetree/bindings/iio/adc/ti,ads7138.yaml
@@ -0,0 +1,63 @@
+# SPDX-License-Identifier: (GPL-2.0 OR BSD-2-Clause)
+%YAML 1.2
+---
+$id: http://devicetree.org/schemas/iio/adc/ti,ads7138.yaml#
+$schema: http://devicetree.org/meta-schemas/core.yaml#
+
+title: Texas Instruments ADS7128/ADS7138 analog-to-digital converter (ADC)
+
+maintainers:
+  - Tobias Sperling <tobias.sperling@softing.com>
+
+description: |
+  The ADS7128 and ADS7138 chips are 12-bit, 8 channel analog-to-digital
+  converters (ADC) with build-in digital window comparator (DWC), using the
+  I2C interface.
+  ADS7128 differs in the addition of further hardware features, like a
+  root-mean-square (RMS) and a zero-crossing-detect (ZCD) module.
+
+  Datasheets:
+    https://www.ti.com/product/ADS7128
+    https://www.ti.com/product/ADS7138
+
+properties:
+  compatible:
+    enum:
+      - ti,ads7128
+      - ti,ads7138
+
+  reg:
+    maxItems: 1
+
+  avdd-supply:
+    description:
+      The regulator used as analog supply voltage as well as reference voltage.
+
+  interrupts:
+    description:
+      Interrupt on ALERT pin, triggers on low level.
+    maxItems: 1
+
+required:
+  - compatible
+  - reg
+  - avdd-supply
+
+additionalProperties: false
+
+examples:
+  - |
+    #include <dt-bindings/interrupt-controller/irq.h>
+    i2c {
+        #address-cells = <1>;
+        #size-cells = <0>;
+
+        adc@10 {
+            compatible = "ti,ads7138";
+            reg = <0x10>;
+            avdd-supply = <&reg_stb_3v3>;
+            interrupt-parent = <&gpio2>;
+            interrupts = <12 IRQ_TYPE_LEVEL_LOW>;
+        };
+    };
+...