linux-kernel - [PATCH 1/2] dt-bindings: iio: spi-dac: Add driver for SPI shift register DACs

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Date:   Wed, 13 Dec 2023 10:09:09 +0100
From:   Mike Looijmans <mike.looijmans@...ic.nl>
To:     devicetree@...r.kernel.org, linux-iio@...r.kernel.org
CC:     Mike Looijmans <mike.looijmans@...ic.nl>,
        Conor Dooley <conor+dt@...nel.org>,
        Jonathan Cameron <jic23@...nel.org>,
        Krzysztof Kozlowski <krzysztof.kozlowski+dt@...aro.org>,
        Lars-Peter Clausen <lars@...afoo.de>,
        Rob Herring <robh+dt@...nel.org>, linux-kernel@...r.kernel.org
Subject: [PATCH 1/2] dt-bindings: iio: spi-dac: Add driver for SPI shift register DACs

Add a driver for generic serial shift register DACs like TI DAC714.

Signed-off-by: Mike Looijmans <mike.looijmans@...ic.nl>

---

 .../devicetree/bindings/iio/dac/spidac.yaml   | 69 +++++++++++++++++++
 1 file changed, 69 insertions(+)
 create mode 100644 Documentation/devicetree/bindings/iio/dac/spidac.yaml

diff --git a/Documentation/devicetree/bindings/iio/dac/spidac.yaml b/Documentation/devicetree/bindings/iio/dac/spidac.yaml
new file mode 100644
index 000000000000..be98da728594
--- /dev/null
+++ b/Documentation/devicetree/bindings/iio/dac/spidac.yaml
@@ -0,0 +1,69 @@
+# SPDX-License-Identifier: (GPL-2.0 OR BSD-2-Clause)
+%YAML 1.2
+---
+$id: http://devicetree.org/schemas/iio/dac/spidac.yaml#
+$schema: http://devicetree.org/meta-schemas/core.yaml#
+
+title: Generic "shift register" SPI DAC
+
+description:
+  Supports simple SPI "shift register" DACs, like TI's DAC714. These DACs have
+  no control registers or commands, they just use a clock and serial data to
+  shift in a raw DAC value. Multiple DACs can be daisy-chained together.
+
+maintainers:
+  - Mike Looijmans <mike.looijmans@...ic.nl>
+
+properties:
+  compatible:
+    enum:
+      - spi-dac
+      - ti,dac714
+
+  reg:
+    maxItems: 1
+
+  ldac-gpios:
+    description:
+      LDAC pin to be used as a hardware trigger to update the DAC outputs. Not
+      needed when the DACs use the chip select to update their output.
+    maxItems: 1
+
+  reset-gpios:
+    description:
+      Optional reset pin that resets all DACs.
+    maxItems: 1
+
+  num-channels:
+    description:
+      Number of channels (usually the number of DAC chips in series)
+    $ref: /schemas/types.yaml#/definitions/uint32
+
+  bits-per-channel:
+    description:
+       Number of bits for each DAC output.
+    $ref: /schemas/types.yaml#/definitions/uint32
+
+required:
+  - compatible
+  - reg
+
+allOf:
+  - $ref: /schemas/spi/spi-peripheral-props.yaml#
+
+unevaluatedProperties: false
+
+examples:
+  - |
+    #include <dt-bindings/gpio/gpio.h>
+    spi {
+        #address-cells = <1>;
+        #size-cells = <0>;
+
+        dac@1 {
+            compatible = "spidac";
+            reg = <0x1>;
+            ldac-gpios = <&gpio 42 GPIO_ACTIVE_LOW>;
+        };
+    };
+...
-- 
2.34.1


Met vriendelijke groet / kind regards,

Mike Looijmans
System Expert


TOPIC Embedded Products B.V.
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The Netherlands

T: +31 (0) 499 33 69 69
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