linux-kernel - [PATCH v4 1/2] dt-bindings: iio: adc: Add binding for AD7380 ADCs

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Message-ID: <20240110-ad7380-mainline-v4-1-93a1d96b50fa@baylibre.com>
Date: Wed, 10 Jan 2024 14:28:40 -0600
From: David Lechner <dlechner@...libre.com>
To: linux-iio@...r.kernel.org,
	devicetree@...r.kernel.org
Cc: David Lechner <dlechner@...libre.com>,
	Rob Herring <robh+dt@...nel.org>,
	Krzysztof Kozlowski <krzysztof.kozlowski+dt@...aro.org>,
	Conor Dooley <conor+dt@...nel.org>,
	Jonathan Cameron <jic23@...nel.org>,
	Michael Hennerich <michael.hennerich@...log.com>,
	Nuno Sá <nuno.sa@...log.com>,
	Liam Girdwood <lgirdwood@...il.com>,
	Mark Brown <broonie@...nel.org>,
	linux-kernel@...r.kernel.org
Subject: [PATCH v4 1/2] dt-bindings: iio: adc: Add binding for AD7380 ADCs

This adds a binding specification for the Analog Devices Inc. AD7380
family of ADCs.

Signed-off-by: David Lechner <dlechner@...libre.com>
---

As discussed in [1], the proposed spi-rx-bus-channels property is a complex
new SPI core feature, so it was nacked for now on the grounds that it should
be accepted without the corresponding SPI core changes. I dropped the Reviewed-by
since no DT maintainers responded on that thread.

[1]: https://lore.kernel.org/linux-spi/0a774bc6-3bf9-4b5f-92e0-8bd673e71a33@sirena.org.uk/

Changes in v4:
- Dropped spi-rx-bus-channels property.

Changes in v3:
- Picked up Conor's Reviewed-By on the adi,ad7380 bindings

Changes in v2:
- Added new patch with generic spi-rx-bus-channels property
- Added maxItems to reg property
- Replaced adi,sdo-mode property with spi-rx-bus-channels
- Made spi-rx-bus-channels property optional with default value of 1
    (this made the if: check more complex)
- Changed example to use gpio for interrupt


 .../devicetree/bindings/iio/adc/adi,ad7380.yaml    | 86 ++++++++++++++++++++++
 MAINTAINERS                                        |  9 +++
 2 files changed, 95 insertions(+)

diff --git a/Documentation/devicetree/bindings/iio/adc/adi,ad7380.yaml b/Documentation/devicetree/bindings/iio/adc/adi,ad7380.yaml
new file mode 100644
index 000000000000..5a70d1ee768b
--- /dev/null
+++ b/Documentation/devicetree/bindings/iio/adc/adi,ad7380.yaml
@@ -0,0 +1,86 @@
+# SPDX-License-Identifier: (GPL-2.0-only OR BSD-2-Clause)
+%YAML 1.2
+---
+$id: http://devicetree.org/schemas/iio/adc/adi,ad7380.yaml#
+$schema: http://devicetree.org/meta-schemas/core.yaml#
+
+title: Analog Devices Simultaneous Sampling Analog to Digital Converters
+
+maintainers:
+  - Michael Hennerich <Michael.Hennerich@...log.com>
+  - Nuno Sá <nuno.sa@...log.com>
+
+description: |
+  * https://www.analog.com/en/products/ad7380.html
+  * https://www.analog.com/en/products/ad7381.html
+  * https://www.analog.com/en/products/ad7383.html
+  * https://www.analog.com/en/products/ad7384.html
+
+$ref: /schemas/spi/spi-peripheral-props.yaml#
+
+properties:
+  compatible:
+    enum:
+      - adi,ad7380
+      - adi,ad7381
+      - adi,ad7383
+      - adi,ad7384
+
+  reg:
+    maxItems: 1
+
+  spi-max-frequency:
+    maximum: 80000000
+  spi-cpol: true
+  spi-cpha: true
+
+  vcc-supply:
+    description: A 3V to 3.6V supply that powers the chip.
+
+  vlogic-supply:
+    description:
+      A 1.65V to 3.6V supply for the logic pins.
+
+  refio-supply:
+    description:
+      A 2.5V to 3.3V supply for the external reference voltage. When omitted,
+      the internal 2.5V reference is used.
+
+  interrupts:
+    description:
+      When the device is using 1-wire mode, this property is used to optionally
+      specify the ALERT interrupt.
+    maxItems: 1
+
+required:
+  - compatible
+  - reg
+  - vcc-supply
+  - vlogic-supply
+
+unevaluatedProperties: false
+
+examples:
+  - |
+    #include <dt-bindings/interrupt-controller/irq.h>
+
+    spi {
+        #address-cells = <1>;
+        #size-cells = <0>;
+
+        adc@0 {
+            compatible = "adi,ad7380";
+            reg = <0>;
+
+            spi-cpol;
+            spi-cpha;
+            spi-max-frequency = <80000000>;
+
+            interrupts = <27 IRQ_TYPE_EDGE_FALLING>;
+            interrupt-parent = <&gpio0>;
+
+            vcc-supply = <&supply_3_3V>;
+            vlogic-supply = <&supply_3_3V>;
+            refio-supply = <&supply_2_5V>;
+        };
+    };
diff --git a/MAINTAINERS b/MAINTAINERS
index fe1f6f97f96a..e2a998be5879 100644
--- a/MAINTAINERS
+++ b/MAINTAINERS
@@ -430,6 +430,15 @@ W:	http://wiki.analog.com/AD7142
 W:	https://ez.analog.com/linux-software-drivers
 F:	drivers/input/misc/ad714x.c
 
+AD738X ADC DRIVER (AD7380/1/2/4)
+M:	Michael Hennerich <michael.hennerich@...log.com>
+M:	Nuno Sá <nuno.sa@...log.com>
+R:	David Lechner <dlechner@...libre.com>
+S:	Supported
+W:	https://wiki.analog.com/resources/tools-software/linux-drivers/iio-adc/ad738x
+W:	https://ez.analog.com/linux-software-drivers
+F:	Documentation/devicetree/bindings/iio/adc/adi,ad7380.yaml
+
 AD7877 TOUCHSCREEN DRIVER
 M:	Michael Hennerich <michael.hennerich@...log.com>
 S:	Supported

-- 
2.43.0