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Message-ID: <20251105143814.1807444-2-o.rempel@pengutronix.de>
Date: Wed, 5 Nov 2025 15:38:13 +0100
From: Oleksij Rempel <o.rempel@...gutronix.de>
To: Jonathan Cameron <jic23@...nel.org>,
Rob Herring <robh@...nel.org>,
Krzysztof Kozlowski <krzk+dt@...nel.org>,
Conor Dooley <conor+dt@...nel.org>
Cc: Oleksij Rempel <o.rempel@...gutronix.de>,
kernel@...gutronix.de,
linux-kernel@...r.kernel.org,
linux-iio@...r.kernel.org,
devicetree@...r.kernel.org,
Andy Shevchenko <andy.shevchenko@...il.com>,
David Lechner <dlechner@...libre.com>,
Nuno Sá <nuno.sa@...log.com>
Subject: [PATCH v1 1/2] bindings: iio: adc: Add bindings for TI ADS131M0x ADCs
Add device tree bindings documentation for the Texas Instruments
ADS131M0x analog-to-digital converters. This family includes the ADS131M02,
ADS131M03, ADS131M04, ADS131M06, and ADS131M08 variants.
Signed-off-by: Oleksij Rempel <o.rempel@...gutronix.de>
---
.../bindings/iio/adc/ti,ads131m08.yaml | 162 ++++++++++++++++++
1 file changed, 162 insertions(+)
create mode 100644 Documentation/devicetree/bindings/iio/adc/ti,ads131m08.yaml
diff --git a/Documentation/devicetree/bindings/iio/adc/ti,ads131m08.yaml b/Documentation/devicetree/bindings/iio/adc/ti,ads131m08.yaml
new file mode 100644
index 000000000000..193ac84c41cd
--- /dev/null
+++ b/Documentation/devicetree/bindings/iio/adc/ti,ads131m08.yaml
@@ -0,0 +1,162 @@
+# SPDX-License-Identifier: (GPL-2.0-only OR BSD-2-Clause)
+%YAML 1.2
+---
+$id: http://devicetree.org/schemas/iio/adc/ti,ads131m08.yaml#
+$schema: http://devicetree.org/meta-schemas/core.yaml#
+
+title: Texas Instruments ADS131M0x 2-, 3-, 4-, 6- and 8-Channel ADCs
+
+maintainers:
+ - Oleksij Rempel <o.rempel@...gutronix.de>
+
+description: |
+ The ADS131M0x are a family of multichannel, simultaneous sampling,
+ 24-bit, delta-sigma, analog-to-digital converters (ADCs) with a
+ built-in programmable gain amplifier (PGA) and internal reference.
+ Communication with the ADC chip is via SPI.
+
+ Datasheets:
+ - ADS131M08: https://www.ti.com/lit/ds/symlink/ads131m08.pdf
+ - ADS131M06: https://www.ti.com/lit/ds/symlink/ads131m06.pdf
+ - ADS131M04: https://www.ti.com/lit/ds/symlink/ads131m04.pdf
+ - ADS131M03: https://www.ti.com/lit/ds/symlink/ads131m03.pdf
+ - ADS131M02: https://www.ti.com/lit/ds/symlink/ads131m02.pdf
+
+properties:
+ compatible:
+ enum:
+ - ti,ads131m02
+ - ti,ads131m03
+ - ti,ads131m04
+ - ti,ads131m06
+ - ti,ads131m08
+
+ reg:
+ description: SPI chip select number.
+
+ clocks:
+ description:
+ Phandle to the external clock source required by the ADC's CLKIN pin.
+ The datasheet recommends specific frequencies based on the desired power
+ mode (e.g., 8.192 MHz for High-Resolution mode).
+ maxItems: 1
+
+ '#address-cells':
+ const: 1
+
+ '#size-cells':
+ const: 0
+
+required:
+ - compatible
+ - reg
+ - clocks
+
+patternProperties:
+ "^channel@([0-7])$":
+ type: object
+ $ref: /schemas/iio/adc/adc.yaml#
+ description: |
+ Properties for a single ADC channel. The maximum valid channel number
+ depends on the specific compatible string used (e.g., 0-1 for ads131m02,
+ 0-7 for ads131m08).
+
+ properties:
+ reg:
+ description: The channel index (0-7).
+ minimum: 0
+ maximum: 7 # Max channels on ADS131M08
+
+ label: true
+
+ required:
+ - reg
+
+ unevaluatedProperties: false
+
+allOf:
+ - $ref: /schemas/spi/spi-peripheral-props.yaml#
+
+ - if:
+ properties:
+ compatible:
+ contains:
+ const: ti,ads131m02
+ then:
+ patternProperties:
+ "^channel@[0-7]$":
+ properties:
+ reg:
+ maximum: 1
+ "^channel@([2-7])$": false
+
+ - if:
+ properties:
+ compatible:
+ contains:
+ const: ti,ads131m03
+ then:
+ patternProperties:
+ "^channel@[0-7]$":
+ properties:
+ reg:
+ maximum: 2
+ "^channel@([3-7])$": false
+
+ - if:
+ properties:
+ compatible:
+ contains:
+ const: ti,ads131m04
+ then:
+ patternProperties:
+ "^channel@[0-7]$":
+ properties:
+ reg:
+ maximum: 3
+ "^channel@([4-7])$": false
+
+ - if:
+ properties:
+ compatible:
+ contains:
+ const: ti,ads131m06
+ then:
+ patternProperties:
+ "^channel@[0-7]$":
+ properties:
+ reg:
+ maximum: 5
+ "^channel@([6-7])$": false
+
+unevaluatedProperties: false
+
+examples:
+ - |
+ #include <dt-bindings/clock/stm32mp1-clks.h>
+
+ spi1 {
+ #address-cells = <1>;
+ #size-cells = <0>;
+
+ adc@0 {
+ compatible = "ti,ads131m02";
+ reg = <0>;
+ spi-max-frequency = <8000000>;
+
+ clocks = <&rcc CK_MCO2>;
+
+ #address-cells = <1>;
+ #size-cells = <0>;
+
+ channel@0 {
+ reg = <0>;
+ label = "input_voltage";
+ };
+
+ channel@1 {
+ reg = <1>;
+ label = "input_current";
+ };
+ };
+ };
--
2.47.3
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