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Message-ID: <20240529160057.6327-1-ramona.nechita@analog.com>
Date: Wed, 29 May 2024 19:00:52 +0300
From: ranechita <ramona.nechita@...log.com>
To: <linux-iio@...r.kernel.org>
CC: ranechita <ramona.nechita@...log.com>,
Jonathan Cameron
<jic23@...nel.org>,
Lars-Peter Clausen <lars@...afoo.de>,
Michael Hennerich
<Michael.Hennerich@...log.com>,
Rob Herring <robh@...nel.org>,
Krzysztof
Kozlowski <krzk+dt@...nel.org>,
Conor Dooley <conor+dt@...nel.org>, <linux-kernel@...r.kernel.org>,
<devicetree@...r.kernel.org>
Subject: [PATCH v2] dt-bindings: iio: adc: add a7779 doc
Add dt bindings for adc ad7779.
Signed-off-by: ranechita <ramona.nechita@...log.com>
---
.../ABI/testing/sysfs-bus-iio-adc-ad777x | 23 +++++
.../bindings/iio/adc/adi,ad7779.yaml | 89 +++++++++++++++++++
2 files changed, 112 insertions(+)
create mode 100644 Documentation/ABI/testing/sysfs-bus-iio-adc-ad777x
create mode 100644 Documentation/devicetree/bindings/iio/adc/adi,ad7779.yaml
diff --git a/Documentation/ABI/testing/sysfs-bus-iio-adc-ad777x b/Documentation/ABI/testing/sysfs-bus-iio-adc-ad777x
new file mode 100644
index 000000000000..0a57fda598e6
--- /dev/null
+++ b/Documentation/ABI/testing/sysfs-bus-iio-adc-ad777x
@@ -0,0 +1,23 @@
+What: /sys/bus/iio/devices/iio:deviceX/filter_type_available
+KernelVersion: 6.1
+Contact: linux-iio@...r.kernel.org
+Description:
+ Reading returns a list with the possible filter modes. Only supported by
+ AD7771.
+
+ * "sinc3" - The digital sinc3 filter implements three main notches, one at
+ the maximum ODR (128 kHz or 32 kHz, depending on the
+ power mode) and another two at the ODR frequency selected to
+ stop noise aliasing into the pass band.
+
+ * "sinc5" - The sinc5 filter implements five notches, one at
+ the maximum ODR (128 kHz or 32 kHz, depending on the
+ power mode) and another four at the ODR frequency
+ selected to stop noise aliasing into the pass band.
+
+What: /sys/bus/iio/devices/iio:deviceX/filter_type
+KernelVersion: 6.1
+Contact: linux-iio@...r.kernel.org
+Description:
+ Set the filter mode of the differential channel. The current sampling_frequency
+ is set according to the filter range. Only supported by AD7771.
diff --git a/Documentation/devicetree/bindings/iio/adc/adi,ad7779.yaml b/Documentation/devicetree/bindings/iio/adc/adi,ad7779.yaml
new file mode 100644
index 000000000000..190070ed80b5
--- /dev/null
+++ b/Documentation/devicetree/bindings/iio/adc/adi,ad7779.yaml
@@ -0,0 +1,89 @@
+# SPDX-License-Identifier: (GPL-2.0-only OR BSD-2-Clause)
+%YAML 1.2
+---
+$id: http://devicetree.org/schemas/iio/adc/adi,ad7779.yaml#
+$schema: http://devicetree.org/meta-schemas/core.yaml#
+
+title: Analog Devices AD777X family 8-Channel, 24-Bit, Simultaneous Sampling ADCs
+
+maintainers:
+ - Ramona Nechita <ramona.nechita@...log.com>
+
+description: |
+ The AD777X family consist of 8-channel, simultaneous sampling analog-to-
+ digital converter (ADC). Eight full Σ-Δ ADCs are on-chip. The
+ AD7771 provides an ultralow input current to allow direct sensor
+ connection. Each input channel has a programmable gain stage
+ allowing gains of 1, 2, 4, and 8 to map lower amplitude sensor
+ outputs into the full-scale ADC input range, maximizing the
+ dynamic range of the signal chain.
+
+ https://www.analog.com/media/en/technical-documentation/data-sheets/ad7770.pdf
+ https://www.analog.com/media/en/technical-documentation/data-sheets/ad7771.pdf
+ https://www.analog.com/media/en/technical-documentation/data-sheets/ad7779.pdf
+
+$ref: /schemas/spi/spi-peripheral-props.yaml#
+
+properties:
+ compatible:
+ enum:
+ - adi,ad7770
+ - adi,ad7771
+ - adi,ad7779
+
+ reg:
+ maxItems: 1
+
+ '#address-cells':
+ const: 1
+
+ '#size-cells':
+ const: 0
+
+ spi-max-frequency: true
+
+ clocks:
+ maxItems: 1
+
+ interrupts:
+ maxItems: 1
+
+ vref-supply:
+ description:
+ ADC reference voltage supply
+
+ start-gpios:
+ description:
+ Pin that controls start synchronization pulse.
+ maxItems: 1
+
+ reset-gpios:
+ maxItems: 1
+
+required:
+ - compatible
+ - reg
+ - clocks
+ - clock-names
+
+unevaluatedProperties: false
+
+examples:
+ - |
+ #include <dt-bindings/gpio/gpio.h>
+ spi {
+ #address-cells = <1>;
+ #size-cells = <0>;
+
+ adc@0 {
+ compatible = "adi,ad7779";
+ reg = <0>;
+ spi-max-frequency = <20000000>;
+ vref-supply = <&vref>;
+ start-gpios = <&gpio0 87 GPIO_ACTIVE_LOW>;
+ reset-gpios = <&gpio0 93 GPIO_ACTIVE_LOW>;
+ clocks = <&adc_clk>;
+ clock-names = "adc-clk";
+ };
+ };
+...
--
2.43.0
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