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Message-ID: <a8d891521ba8c9b4924ead29e5dba163b43d88ed.1763478299.git.marcelo.schmitt@analog.com>
Date: Tue, 18 Nov 2025 14:32:22 -0300
From: Marcelo Schmitt <marcelo.schmitt@...log.com>
To: <linux-iio@...r.kernel.org>, <devicetree@...r.kernel.org>,
<linux-doc@...r.kernel.org>, <linux-kernel@...r.kernel.org>
CC: <jic23@...nel.org>, <nuno.sa@...log.com>, <dlechner@...libre.com>,
<andy@...nel.org>, <Michael.Hennerich@...log.com>, <robh@...nel.org>,
<krzk+dt@...nel.org>, <conor+dt@...nel.org>, <corbet@....net>,
<cosmin.tanislav@...log.com>, <marcelo.schmitt1@...il.com>
Subject: [PATCH v2 1/3] dt-bindings: iio: adc: Add AD4134
Add device tree documentation for AD4134 24-Bit, 4-channel simultaneous
sampling, precision ADC.
Signed-off-by: Marcelo Schmitt <marcelo.schmitt@...log.com>
---
Change log v1 -> v2:
- Dropped adi,control-mode property (can be inferred from the parent bus).
adi,asrc-mode, adi,dclkio, adi,dclkmode, were also pondered for removal
since they are not needed for when AD4134 is connected to an SPI bus (current
use case). Though, since those properties will be needed for when AD4134 is not
connected to an SPI bus, I decided to keep them (based on v1 feedback [1]).
[1]: https://lore.kernel.org/linux-iio/20251114-unmasking-nerd-d5c147c43bad@spud/
.../bindings/iio/adc/adi,ad4134.yaml | 198 ++++++++++++++++++
MAINTAINERS | 7 +
2 files changed, 205 insertions(+)
create mode 100644 Documentation/devicetree/bindings/iio/adc/adi,ad4134.yaml
diff --git a/Documentation/devicetree/bindings/iio/adc/adi,ad4134.yaml b/Documentation/devicetree/bindings/iio/adc/adi,ad4134.yaml
new file mode 100644
index 000000000000..6d17c0837c05
--- /dev/null
+++ b/Documentation/devicetree/bindings/iio/adc/adi,ad4134.yaml
@@ -0,0 +1,198 @@
+# SPDX-License-Identifier: (GPL-2.0-only OR BSD-2-Clause)
+%YAML 1.2
+---
+$id: http://devicetree.org/schemas/iio/adc/adi,ad4134.yaml#
+$schema: http://devicetree.org/meta-schemas/core.yaml#
+
+title: Analog Devices AD4134 ADC
+
+maintainers:
+ - Marcelo Schmitt <marcelo.schmitt@...log.com>
+
+description: |
+ The AD4134 is a quad channel, low noise, simultaneous sampling, precision
+ analog-to-digital converter (ADC).
+ Specifications can be found at:
+ https://www.analog.com/media/en/technical-documentation/data-sheets/ad4134.pdf
+
+$ref: /schemas/spi/spi-peripheral-props.yaml#
+
+properties:
+ compatible:
+ enum:
+ - adi,ad4134
+
+ reg:
+ maxItems: 1
+
+ spi-max-frequency:
+ maximum: 50000000
+
+ avdd5-supply:
+ description: A 5V supply that powers the chip's analog circuitry.
+
+ dvdd5-supply:
+ description: A 5V supply that powers the chip's digital circuitry.
+
+ iovdd-supply:
+ description:
+ A 1.8V supply that sets the logic levels for the digital interface pins.
+
+ refin-supply:
+ description:
+ A 4.096V or 5V supply that serves as reference for ADC conversions.
+
+ avdd1v8-supply:
+ description: A 1.8V supply used by the analog circuitry.
+
+ dvdd1v8-supply:
+ description: A 1.8V supply used by the digital circuitry.
+
+ clkvdd-supply:
+ description: A 1.8V supply for the chip's clock management circuit.
+
+ ldoin-supply:
+ description:
+ A 2.6V to 5.5V supply that generates 1.8V for AVDD1V8, DVDD1V8, and CLKVDD
+ pins.
+
+ clocks:
+ maxItems: 1
+ description:
+ Required external clock source. Can specify either a crystal or CMOS clock
+ source. If an external crystal is set, connect the CLKSEL pin to IOVDD.
+ Otherwise, connect the CLKSEL pin to IOGND and the external CMOS clock
+ signal to the XTAL2/CLKIN pin.
+
+ clock-names:
+ enum:
+ - xtal1-xtal2
+ - clkin
+ default: clkin
+
+ '#clock-cells':
+ const: 0
+
+ clock-output-names:
+ maxItems: 1
+
+ regulators:
+ type: object
+ description:
+ list of regulators provided by this controller.
+
+ properties:
+ vcm-output:
+ $ref: /schemas/regulator/regulator.yaml#
+ type: object
+ unevaluatedProperties: false
+
+ additionalProperties: false
+
+ reset-gpios:
+ maxItems: 1
+
+ powerdown-gpios:
+ description:
+ Active low GPIO connected to the /PDN pin. Forces the device into full
+ power-down mode when broght low. Pull this input to IOVDD for normal
+ operation.
+ maxItems: 1
+
+ odr-gpios:
+ description:
+ GPIO connected to ODR pin. Used to sample ADC data in minimum I/O mode.
+ maxItems: 1
+
+ adi,asrc-mode:
+ $ref: /schemas/types.yaml#/definitions/string
+ description:
+ Asynchronous Sample Rate Converter (ASRC) operation mode control input.
+ Describes whether the MODE pin is set to a high level (for master mode
+ operation) or to a low level (for slave mode operation).
+ enum: [ high, low ]
+ default: low
+
+ adi,dclkio:
+ description:
+ DCLK pin I/O direction control for when the device operates in Pin Control
+ Slave Mode or in SPI Control Mode. Describes if DEC0/DCLKIO pin is at a
+ high level (which configures DCLK as an output) or to set to a low level
+ (configuring DCLK for input).
+ enum: [ out, in ]
+ default: in
+
+ adi,dclkmode:
+ description:
+ DCLK mode control for when the device operates in Pin Control Slave Mode
+ or in SPI Control Mode. Describes whether the DEC1/DCLKMODE pin is set to
+ a high level (configuring the DCLK to operate in free running mode) or
+ to a low level (to configure DCLK to operate in gated mode).
+ enum: [ free-running, gated ]
+ default: gated
+
+required:
+ - compatible
+ - reg
+ - avdd5-supply
+ - dvdd5-supply
+ - iovdd-supply
+ - refin-supply
+ - clocks
+ - clock-names
+
+allOf:
+ - if:
+ not:
+ required:
+ - ldoin-supply
+ then:
+ required:
+ - avdd1v8-supply
+ - dvdd1v8-supply
+ - clkvdd-supply
+
+unevaluatedProperties: false
+
+examples:
+ - |
+ #include <dt-bindings/gpio/gpio.h>
+
+ spi {
+ #address-cells = <1>;
+ #size-cells = <0>;
+
+ adc@0 {
+ compatible = "adi,ad4134";
+ reg = <0>;
+
+ spi-max-frequency = <1000000>;
+
+ reset-gpios = <&gpio0 86 GPIO_ACTIVE_LOW>;
+ odr-gpios = <&gpio0 87 GPIO_ACTIVE_HIGH>;
+ powerdown-gpios = <&gpio0 88 GPIO_ACTIVE_LOW>;
+
+ clocks = <&sys_clk>;
+ clock-names = "clkin";
+
+ avdd5-supply = <&avdd5>;
+ dvdd5-supply = <&dvdd5>;
+ iovdd-supply = <&iovdd>;
+ refin-supply = <&refin>;
+ avdd1v8-supply = <&avdd1v8>;
+ dvdd1v8-supply = <&dvdd1v8>;
+ clkvdd-supply = <&clkvdd>;
+
+ adi,asrc-mode = "low";
+ adi,dclkio = "in";
+ adi,dclkmode = "gated";
+
+ regulators {
+ vcm_reg: vcm-output {
+ regulator-name = "ad4134-vcm";
+ };
+ };
+
+ };
+ };
+...
diff --git a/MAINTAINERS b/MAINTAINERS
index 31d98efb1ad1..b9029c4055e3 100644
--- a/MAINTAINERS
+++ b/MAINTAINERS
@@ -1449,6 +1449,13 @@ F: Documentation/ABI/testing/sysfs-bus-iio-adc-ad4130
F: Documentation/devicetree/bindings/iio/adc/adi,ad4130.yaml
F: drivers/iio/adc/ad4130.c
+ANALOG DEVICES INC AD4134 DRIVER
+M: Marcelo Schmitt <marcelo.schmitt@...log.com>
+L: linux-iio@...r.kernel.org
+S: Supported
+W: https://ez.analog.com/linux-software-drivers
+F: Documentation/devicetree/bindings/iio/adc/adi,ad4134.yaml
+
ANALOG DEVICES INC AD4170-4 DRIVER
M: Marcelo Schmitt <marcelo.schmitt@...log.com>
L: linux-iio@...r.kernel.org
--
2.51.0
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