linux-kernel - [PATCH v8 1/2] dt-bindings: counter: add interrupt-counter binding

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Date:   Mon,  1 Mar 2021 09:04:00 +0100
From:   Oleksij Rempel <o.rempel@...gutronix.de>
To:     Rob Herring <robh+dt@...nel.org>,
        William Breathitt Gray <vilhelm.gray@...il.com>
Cc:     Oleksij Rempel <o.rempel@...gutronix.de>,
        Linus Walleij <linus.walleij@...aro.org>,
        devicetree@...r.kernel.org, linux-kernel@...r.kernel.org,
        Pengutronix Kernel Team <kernel@...gutronix.de>,
        David Jander <david@...tonic.nl>,
        Robin van der Gracht <robin@...tonic.nl>,
        linux-iio@...r.kernel.org, Jonathan Cameron <jic23@...nel.org>
Subject: [PATCH v8 1/2] dt-bindings: counter: add interrupt-counter binding

Add binding for the interrupt counter node

Signed-off-by: Oleksij Rempel <o.rempel@...gutronix.de>
Reviewed-by: Linus Walleij <linus.walleij@...aro.org>
---
 .../bindings/counter/interrupt-counter.yaml   | 62 +++++++++++++++++++
 1 file changed, 62 insertions(+)
 create mode 100644 Documentation/devicetree/bindings/counter/interrupt-counter.yaml

diff --git a/Documentation/devicetree/bindings/counter/interrupt-counter.yaml b/Documentation/devicetree/bindings/counter/interrupt-counter.yaml
new file mode 100644
index 000000000000..fd075d104631
--- /dev/null
+++ b/Documentation/devicetree/bindings/counter/interrupt-counter.yaml
@@ -0,0 +1,62 @@
+# SPDX-License-Identifier: GPL-2.0
+%YAML 1.2
+---
+$id: http://devicetree.org/schemas/counter/interrupt-counter.yaml#
+$schema: http://devicetree.org/meta-schemas/core.yaml#
+
+title: Interrupt counter
+
+maintainers:
+  - Oleksij Rempel <o.rempel@...gutronix.de>
+
+description: |
+  A generic interrupt counter to measure interrupt frequency. It was developed
+  and used for agricultural devices to measure rotation speed of wheels or
+  other tools. Since the direction of rotation is not important, only one
+  signal line is needed.
+  Interrupts or gpios are required. If both are defined, the interrupt will
+  take precedence for counting interrupts.
+
+properties:
+  compatible:
+    const: interrupt-counter
+
+  interrupts:
+    maxItems: 1
+
+  gpios:
+    maxItems: 1
+
+required:
+  - compatible
+
+anyOf:
+  - required: [ interrupts-extended ]
+  - required: [ interrupts ]
+  - required: [ gpios ]
+
+additionalProperties: false
+
+examples:
+  - |
+
+    #include <dt-bindings/interrupt-controller/irq.h>
+    #include <dt-bindings/gpio/gpio.h>
+
+    counter-0 {
+        compatible = "interrupt-counter";
+        interrupts-extended = <&gpio 0 IRQ_TYPE_EDGE_RISING>;
+    };
+
+    counter-1 {
+        compatible = "interrupt-counter";
+        gpios = <&gpio 2 GPIO_ACTIVE_HIGH>;
+    };
+
+    counter-2 {
+        compatible = "interrupt-counter";
+        interrupts-extended = <&gpio 2 IRQ_TYPE_EDGE_RISING>;
+        gpios = <&gpio 2 GPIO_ACTIVE_HIGH>;
+    };
+
+...
-- 
2.29.2