linux-kernel - [PATCH 2/3] dt-bindings: iio: proximity: Add Nicera D3-323-AA PIR sensor

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Message-ID: <c57675d505e93549bfca5f9909d67822ab304a44.1746802541.git.waqar.hameed@axis.com>
Date: Fri, 9 May 2025 17:03:03 +0200
From: Waqar Hameed <waqar.hameed@...s.com>
To: Jonathan Cameron <jic23@...nel.org>, Lars-Peter Clausen <lars@...afoo.de>,
	Rob Herring <robh@...nel.org>, Krzysztof Kozlowski <krzk+dt@...nel.org>,
	Conor Dooley <conor+dt@...nel.org>
CC: <kernel@...s.com>, <linux-iio@...r.kernel.org>,
	<devicetree@...r.kernel.org>, <linux-kernel@...r.kernel.org>
Subject: [PATCH 2/3] dt-bindings: iio: proximity: Add Nicera D3-323-AA PIR
 sensor

Nicera D3-323-AA is a PIR sensor for human detection. It has support for
raw data measurements and detection notification. The communication
protocol is custom made and therefore needs to be GPIO bit banged.

Add devicetree bindings requiring the compatible string and the various
GPIOs needed for operation. Some of the GPIOs have multiple use-cases
depending on device state. Describe these thoroughly.

Signed-off-by: Waqar Hameed <waqar.hameed@...s.com>
---
 .../iio/proximity/nicera,d3323aa.yaml         | 67 +++++++++++++++++++
 1 file changed, 67 insertions(+)
 create mode 100644 Documentation/devicetree/bindings/iio/proximity/nicera,d3323aa.yaml

diff --git a/Documentation/devicetree/bindings/iio/proximity/nicera,d3323aa.yaml b/Documentation/devicetree/bindings/iio/proximity/nicera,d3323aa.yaml
new file mode 100644
index 000000000000..1ff24dad0086
--- /dev/null
+++ b/Documentation/devicetree/bindings/iio/proximity/nicera,d3323aa.yaml
@@ -0,0 +1,67 @@
+# SPDX-License-Identifier: (GPL-2.0-only OR BSD-2-Clause)
+%YAML 1.2
+---
+$id: http://devicetree.org/schemas/iio/proximity/nicera,d3323aa.yaml#
+$schema: http://devicetree.org/meta-schemas/core.yaml#
+
+title: Nicera D3-323-AA PIR sensor
+
+maintainers:
+  - Waqar Hameed <waqar.hameed@...s.com>
+
+description: |
+  PIR sensor for human detection.
+  Datasheet: https://www.endrich.com/Datenbl%C3%A4tter/Sensoren/D3-323-AA_e.pdf
+
+properties:
+  compatible:
+    const: nicera,d3323aa
+
+  vdd-gpio:
+    maxItems: 1
+    description:
+      GPIO for supply voltage (1.8 to 5.5 V).
+      This GPIO will be driven low by the driver in order to cut the supply and
+      reset the device (driving it then back to high to power it on).
+
+  clk-vout-gpio:
+    maxItems: 1
+    description:
+      GPIO for clock and detection.
+      After reset, the device signals with two falling edges on this pin that it
+      is ready for configuration (within 1.2 s), which the driver listens for as
+      interrupts.
+      During configuration, it is used as clock for data reading and writing (on
+      data-gpio). The driver drives this pin with the frequency of 1 kHz (bit
+      banging).
+      After all this, the device is now in operational mode and signals on this
+      pin for any detections. The driver listens for this as interrupts.
+
+  data-gpio:
+    maxItems: 1
+    description:
+      GPIO for data reading and writing.
+      During configuration, configuration data will be written and read back
+      with bit banging (together with clk-vout-gpio as clock).
+      After this, during operational mode, the device will output serial data on
+      this GPIO. However, the driver currently doesn't read this.
+
+required:
+  - compatible
+  - vdd-gpio
+  - clk-vout-gpio
+  - data-gpio
+
+additionalProperties: false
+
+examples:
+  - |
+    #include <dt-bindings/gpio/gpio.h>
+
+    proximity {
+        compatible = "nicera,d3323aa";
+        vdd-gpio = <&gpio 73 0>;
+        clk-vout-gpio = <&gpio 78 0>;
+        data-gpio = <&gpio 76 0>;
+    };
+...
-- 
2.39.5