linux-kernel - [PATCHv2 1/4] dt-bindings: wiegand: add Wiegand controller common properties

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Date:   Thu,  2 Feb 2023 15:33:02 +0100
From:   Martin Zaťovič <m.zatovic1@...il.com>
To:     linux-kernel@...r.kernel.org
Cc:     robh+dt@...nel.org, krzysztof.kozlowski+dt@...aro.org,
        gregkh@...uxfoundation.org, martin.petersen@...cle.com,
        beanhuo@...ron.com, arnd@...db.de, avri.altman@....com,
        iwona.winiarska@...el.com, fmdefrancesco@...il.com,
        dipenp@...dia.com, ogabbay@...nel.org, bvanassche@....org,
        mathieu.poirier@...aro.org, yangyicong@...ilicon.com,
        dan.j.williams@...el.com, devicetree@...r.kernel.org,
        linus.walleij@...aro.org,
        Martin Zaťovič <m.zatovic1@...il.com>
Subject: [PATCHv2 1/4] dt-bindings: wiegand: add Wiegand controller common properties

Weigand bus is defined by a Wiegand controller node. This node
can contain one or more device nodes for devices attached to
the controller(it is advised to only connect one device as Wiegand
is a point-to-point bus).

Wiegand controller needs to specify several attributes such as
the pulse length in order to function properly. These attributes
are documented here.

Signed-off-by: Martin Zaťovič <m.zatovic1@...il.com>
---
 .../bindings/wiegand/wiegand-controller.yaml  | 50 +++++++++++++++++++
 MAINTAINERS                                   |  5 ++
 2 files changed, 55 insertions(+)
 create mode 100644 Documentation/devicetree/bindings/wiegand/wiegand-controller.yaml

diff --git a/Documentation/devicetree/bindings/wiegand/wiegand-controller.yaml b/Documentation/devicetree/bindings/wiegand/wiegand-controller.yaml
new file mode 100644
index 000000000000..fed90e01e56f
--- /dev/null
+++ b/Documentation/devicetree/bindings/wiegand/wiegand-controller.yaml
@@ -0,0 +1,50 @@
+# SPDX-License-Identifier: (GPL-2.0 OR BSD-2-Clause)
+%YAML 1.2
+---
+$id: http://devicetree.org/schemas/wiegand/wiegand-controller.yaml#
+$schema: http://devicetree.org/meta-schemas/core.yaml#
+
+title: Wiegand Generic Controller Common Properties
+
+maintainers:
+  - Martin Zaťovič <martin.zatovic@...-biometrics.com>
+
+description:
+  Wiegand busses can be described with a node for the Wiegand controller device
+  and a set of child nodes for each SPI slave on the bus.
+
+properties:
+  $nodename:
+    pattern: "^wiegand(@.*|-[0-9a-f])?$"
+
+  pulse-len-us:
+    description: |
+      Length of the low pulse in microseconds.
+
+  interval-len-us:
+    description: |
+      Length of a whole bit (both the pulse and the high phase) in microseconds.
+
+  frame-gap-us:
+    description: |
+      Length of the last bit of a frame (both the pulse and the high phase) in
+      microseconds.
+
+required:
+  - compatible
+  - pulse-len-us
+  - interval-len-us
+  - frame-gap-us
+
+additionalProperties: true
+
+examples:
+  - |
+    wiegand@f00 {
+        compatible = "wiegand-foo";
+        pulse-len-us = <50>;
+        interval-len-us = <2000>;
+        frame-gap-us = <2000>;
+
+        /* devices */
+    };
diff --git a/MAINTAINERS b/MAINTAINERS
index 7f86d02cb427..db9624d93af0 100644
--- a/MAINTAINERS
+++ b/MAINTAINERS
@@ -22428,6 +22428,11 @@ L:	linux-input@...r.kernel.org
 S:	Maintained
 F:	drivers/hid/hid-wiimote*
 
+WIEGAND BUS DRIVER
+M:	Martin Zaťovič <m.zatovic1@...il.com>
+S:	Maintained
+F:	Documentation/devicetree/bindings/wiegand/wiegand-controller.yaml
+
 WILOCITY WIL6210 WIRELESS DRIVER
 L:	linux-wireless@...r.kernel.org
 S:	Orphan
-- 
2.39.1