linux-kernel - [RFC 1/4] dt-bindings: iio: introduce trigger providers, consumers

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Date:   Fri, 17 Feb 2017 17:03:46 +0100
From:   Fabrice Gasnier <fabrice.gasnier@...com>
To:     <jic23@...nel.org>, <linux@...linux.org.uk>, <robh+dt@...nel.org>,
        <linux-arm-kernel@...ts.infradead.org>,
        <devicetree@...r.kernel.org>, <linux-kernel@...r.kernel.org>
CC:     <linux-iio@...r.kernel.org>, <mark.rutland@....com>,
        <mcoquelin.stm32@...il.com>, <alexandre.torgue@...com>,
        <lars@...afoo.de>, <knaack.h@....de>, <pmeerw@...erw.net>,
        <fabrice.gasnier@...com>, <benjamin.gaignard@...aro.org>,
        <benjamin.gaignard@...com>, <linus.walleij@...aro.org>
Subject: [RFC 1/4] dt-bindings: iio: introduce trigger providers, consumers

Document iio provider and consumer bindings.

Signed-off-by: Fabrice Gasnier <fabrice.gasnier@...com>
---
 .../devicetree/bindings/iio/iio-bindings.txt       | 37 ++++++++++++++++++++++
 1 file changed, 37 insertions(+)

diff --git a/Documentation/devicetree/bindings/iio/iio-bindings.txt b/Documentation/devicetree/bindings/iio/iio-bindings.txt
index 68d6f8c..3125390 100644
--- a/Documentation/devicetree/bindings/iio/iio-bindings.txt
+++ b/Documentation/devicetree/bindings/iio/iio-bindings.txt
@@ -95,3 +95,40 @@ vdd channel is connected to output 0 of the &ref device.
 		io-channels = <&adc 10>, <&adc 11>;
 		io-channel-names = "adc1", "adc2";
 	};
+
+==IIO trigger providers==
+Sources of IIO triggers can be represented by any node in the device
+tree. Those nodes are designated as IIO trigger providers. IIO trigger
+consumer uses a phandle and an IIO trigger specifier to connect to an
+IIO trigger provider.
+An IIO trigger specifier is an array of one or more cells identifying
+the IIO trigger output on a device. The length of an IIO trigger
+specifier is defined by the value of a #io-trigger-cells property in
+the IIO trigger provider node.
+
+Required properties:
+#io-trigger-cells:
+		Number of cells in an IIO trigger specifier; Typically
+		0 for nodes with a simple IIO trigger output.
+
+Example:
+	gpiotrig0: iio-gpio-trigger0 {
+		#io-trigger-cells = <0>;
+		compatible = "iio-gpio-trigger";
+		gpios = <&gpioa 11 0>;
+	}
+
+==IIO trigger consumers==
+Required properties:
+- io-triggers:	List of phandle representing the IIO trigger specifier.
+
+Optional properties:
+- io-trigger-names :
+		List of IIO trigger name strings that matches elements
+		in 'io-triggers' list property.
+
+Example:
+	some_trigger_consumer {
+		io-triggers = <&gpiotrig0>;
+		io-trigger-names = "mytrig";
+	}
-- 
1.9.1