From mboxrd@z Thu Jan 1 00:00:00 1970 From: Peter Rosin Subject: [PATCH v14 06/11] dt-bindings: iio: io-channel-mux: document io-channel-mux bindings Date: Mon, 24 Apr 2017 10:36:30 +0200 Message-ID: <1493022995-16917-7-git-send-email-peda@axentia.se> References: <1493022995-16917-1-git-send-email-peda@axentia.se> Mime-Version: 1.0 Content-Type: text/plain Return-path: In-Reply-To: <1493022995-16917-1-git-send-email-peda@axentia.se> Sender: linux-doc-owner@vger.kernel.org To: linux-kernel@vger.kernel.org, Greg Kroah-Hartman Cc: Peter Rosin , Wolfram Sang , Rob Herring , Mark Rutland , Jonathan Cameron , Hartmut Knaack , Lars-Peter Clausen , Peter Meerwald-Stadler , Jonathan Corbet , linux-i2c@vger.kernel.org, devicetree@vger.kernel.org, linux-iio@vger.kernel.org, linux-doc@vger.kernel.org, Andrew Morton , Colin Ian King , Paul Gortmaker , Philipp Zabel , kernel@pengutronix.de List-Id: linux-i2c@vger.kernel.org Describe how a multiplexer can be used to select which signal is fed to an io-channel. Acked-by: Jonathan Cameron Acked-by: Rob Herring Signed-off-by: Peter Rosin --- .../bindings/iio/multiplexer/io-channel-mux.txt | 39 ++++++++++++++++++++++ MAINTAINERS | 6 ++++ 2 files changed, 45 insertions(+) create mode 100644 Documentation/devicetree/bindings/iio/multiplexer/io-channel-mux.txt diff --git a/Documentation/devicetree/bindings/iio/multiplexer/io-channel-mux.txt b/Documentation/devicetree/bindings/iio/multiplexer/io-channel-mux.txt new file mode 100644 index 000000000000..c82794002595 --- /dev/null +++ b/Documentation/devicetree/bindings/iio/multiplexer/io-channel-mux.txt @@ -0,0 +1,39 @@ +I/O channel multiplexer bindings + +If a multiplexer is used to select which hardware signal is fed to +e.g. an ADC channel, these bindings describe that situation. + +Required properties: +- compatible : "io-channel-mux" +- io-channels : Channel node of the parent channel that has multiplexed + input. +- io-channel-names : Should be "parent". +- #address-cells = <1>; +- #size-cells = <0>; +- mux-controls : Mux controller node to use for operating the mux +- channels : List of strings, labeling the mux controller states. + +For each non-empty string in the channels property, an io-channel will +be created. The number of this io-channel is the same as the index into +the list of strings in the channels property, and also matches the mux +controller state. The mux controller state is described in +../mux/mux-controller.txt + +Example: + mux: mux-controller { + compatible = "mux-gpio"; + #mux-control-cells = <0>; + + mux-gpios = <&pioA 0 GPIO_ACTIVE_HIGH>, + <&pioA 1 GPIO_ACTIVE_HIGH>; + }; + + adc-mux { + compatible = "io-channel-mux"; + io-channels = <&adc 0>; + io-channel-names = "parent"; + + mux-controls = <&mux>; + + channels = "sync", "in", "system-regulator"; + }; diff --git a/MAINTAINERS b/MAINTAINERS index 4cfa080878e2..1cde195bba25 100644 --- a/MAINTAINERS +++ b/MAINTAINERS @@ -6360,6 +6360,12 @@ F: Documentation/ABI/testing/sysfs-bus-iio-adc-envelope-detector F: Documentation/devicetree/bindings/iio/adc/envelope-detector.txt F: drivers/iio/adc/envelope-detector.c +IIO MULTIPLEXER +M: Peter Rosin +L: linux-iio@vger.kernel.org +S: Maintained +F: Documentation/devicetree/bindings/iio/multiplexer/iio-mux.txt + IIO SUBSYSTEM AND DRIVERS M: Jonathan Cameron R: Hartmut Knaack -- 2.1.4