linux-kernel - [PATCHv4 3/4] dt-bindings: wiegand: add GPIO bitbanged Wiegand controller

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Date:   Wed, 10 May 2023 18:22:42 +0200
From:   Martin Zaťovič <m.zatovic1@...il.com>
To:     linux-kernel@...r.kernel.org
Cc:     robh+dt@...nel.org, krzysztof.kozlowski+dt@...aro.org,
        conor+dt@...nel.org, gregkh@...uxfoundation.org,
        beanhuo@...ron.com, nipun.gupta@....com, linus.walleij@...aro.org,
        mwen@...lia.com, bvanassche@....org, arnd@...db.de,
        ogabbay@...nel.org, linux@...y.sk,
        jacek.lawrynowicz@...ux.intel.com, geert+renesas@...der.be,
        benjamin.tissoires@...hat.com, masahiroy@...nel.org,
        yangyicong@...ilicon.com, devicetree@...r.kernel.org,
        Martin Zaťovič <m.zatovic1@...il.com>
Subject: [PATCHv4 3/4] dt-bindings: wiegand: add GPIO bitbanged Wiegand controller

GPIO bitbanged Wiegand controller requires definitions of GPIO
lines to be used on top of the common Wiegand properties. Wiegand
utilizes two such lines - D0(low data line) and D1(high data line).

Acked-by: Linus Walleij <linus.walleij@...aro.org>
Signed-off-by: Martin Zaťovič <m.zatovic1@...il.com>
---
 .../bindings/wiegand/wiegand-gpio.yaml        | 51 +++++++++++++++++++
 MAINTAINERS                                   |  5 ++
 2 files changed, 56 insertions(+)
 create mode 100644 Documentation/devicetree/bindings/wiegand/wiegand-gpio.yaml

diff --git a/Documentation/devicetree/bindings/wiegand/wiegand-gpio.yaml b/Documentation/devicetree/bindings/wiegand/wiegand-gpio.yaml
new file mode 100644
index 000000000000..df28929f6dae
--- /dev/null
+++ b/Documentation/devicetree/bindings/wiegand/wiegand-gpio.yaml
@@ -0,0 +1,51 @@
+# SPDX-License-Identifier: (GPL-2.0 OR BSD-2-Clause)
+%YAML 1.2
+---
+$id: http://devicetree.org/schemas/wiegand/wiegand-gpio.yaml#
+$schema: http://devicetree.org/meta-schemas/core.yaml#
+
+title: GPIO bitbanged Wiegand interface devicetree bindings
+
+maintainers:
+  - Martin Zaťovič <m.zatovic1@...il.com>
+
+description:
+  This represents the GPIO lines used for bit-banged Wiegand on dedicated GPIO
+  lines.
+
+allOf:
+  - $ref: /schemas/wiegand/wiegand-controller.yaml#
+
+properties:
+  compatible:
+    const: wiegand-gpio
+
+  data-hi-gpios:
+    description: GPIO used as Wiegands data-hi line.
+    maxItems: 1
+
+  data-lo-gpios:
+    description: GPIO used as Wiegands data-lo line.
+    maxItems: 1
+
+required:
+  - compatible
+  - data-hi-gpios
+  - data-lo-gpios
+
+unevaluatedProperties: false
+
+examples:
+  - |
+    #include <dt-bindings/gpio/gpio.h>
+
+    wiegand@f00 {
+        compatible = "wiegand-gpio";
+        pulse-len-us = <50>;
+        interval-len-us = <2000>;
+        frame-gap-us = <2000>;
+        data-lo-gpios = <&gpio2 6 (GPIO_ACTIVE_HIGH|GPIO_OPEN_DRAIN)>;
+        data-hi-gpios = <&gpio2 7 (GPIO_ACTIVE_HIGH|GPIO_OPEN_DRAIN)>;
+
+        /* devices */
+    };
diff --git a/MAINTAINERS b/MAINTAINERS
index 7b7e546572e8..915cb36e5b2f 100644
--- a/MAINTAINERS
+++ b/MAINTAINERS
@@ -22704,6 +22704,11 @@ F:	Documentation/devicetree/bindings/wiegand/wiegand-controller.yaml
 F:	drivers/wiegand/wiegand.c
 F:	include/linux/wiegand.h
 
+WIEGAND GPIO BITBANG DRIVER
+M:	Martin Zaťovič <m.zatovic1@...il.com>
+S:	Maintained
+F:	Documentation/devicetree/bindings/wiegand/wiegand-gpio.yaml
+
 WILOCITY WIL6210 WIRELESS DRIVER
 L:	linux-wireless@...r.kernel.org
 S:	Orphan
-- 
2.40.0