[PATCH v7 1/2] dt-bindings: counter: add interrupt-counter binding

Oleksij Rempel
2021-02-26T09:12:02Z

Add binding for the interrupt counter node

Signed-off-by: Oleksij Rempel <o.rempel@pengutronix.de>
Reviewed-by: Linus Walleij <linus.walleij@linaro.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@pengutronix.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