linux-kernel - [PATCH v7 11/12] dt-bindings: mux-adg792a: document devicetree bindings for ADG792A/G mux

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Message-Id: <1483532187-28494-12-git-send-email-peda@axentia.se>
Date:   Wed,  4 Jan 2017 13:16:26 +0100
From:   Peter Rosin <peda@...ntia.se>
To:     linux-kernel@...r.kernel.org
Cc:     Peter Rosin <peda@...ntia.se>, Wolfram Sang <wsa@...-dreams.de>,
        Rob Herring <robh+dt@...nel.org>,
        Mark Rutland <mark.rutland@....com>,
        Jonathan Cameron <jic23@...nel.org>,
        Hartmut Knaack <knaack.h@....de>,
        Lars-Peter Clausen <lars@...afoo.de>,
        Peter Meerwald-Stadler <pmeerw@...erw.net>,
        Jonathan Corbet <corbet@....net>,
        Arnd Bergmann <arnd@...db.de>,
        Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        linux-i2c@...r.kernel.org, devicetree@...r.kernel.org,
        linux-iio@...r.kernel.org, linux-doc@...r.kernel.org
Subject: [PATCH v7 11/12] dt-bindings: mux-adg792a: document devicetree bindings for ADG792A/G mux

Analog Devices ADG792A/G is a triple 4:1 mux.

Signed-off-by: Peter Rosin <peda@...ntia.se>
---
 .../devicetree/bindings/mux/mux-adg792a.txt        | 79 ++++++++++++++++++++++
 1 file changed, 79 insertions(+)
 create mode 100644 Documentation/devicetree/bindings/mux/mux-adg792a.txt

diff --git a/Documentation/devicetree/bindings/mux/mux-adg792a.txt b/Documentation/devicetree/bindings/mux/mux-adg792a.txt
new file mode 100644
index 000000000000..0b26dd11f070
--- /dev/null
+++ b/Documentation/devicetree/bindings/mux/mux-adg792a.txt
@@ -0,0 +1,79 @@
+Bindings for Analog Devices ADG792A/G Triple 4:1 Multiplexers
+
+Required properties:
+- compatible : "adi,adg792a" or "adi,adg792g"
+- #mux-control-cells : <0> if parallel, or <1> if not.
+* Standard mux-controller bindings as decribed in mux-controller.txt
+
+Optional properties for ADG792G:
+- gpio-controller : if present, #gpio-cells below is required.
+- #gpio-cells : should be <2>
+			  - First cell is the GPO line number, i.e. 0 or 1
+			  - Second cell is used to specify active high (0)
+			    or active low (1)
+
+Optional properties:
+- adi,parallel : if present, the three muxes are bound together with a single
+  mux controller, controlling all three muxes in parallel.
+- adi,idle-state : if present, array of 2-tuples with mux controller number
+  and state that mux controllers will have when idle. States 0 through 3
+  correspond to signals A through D in the datasheet.
+- adi,idle-high-impedance : if present, array of mux controller numbers that
+  should be in the disconnected high-impedance state when idle.
+
+Mux controller states 0 through 3 correspond to signals A through D in the
+datasheet. If a mux controller is mentioned in neither adi,idle-state nor
+adi,idle-high-impedance it is left in its previously selected state when idle.
+
+Example:
+
+	/*
+	 * Three independent mux controllers (of which one is used).
+	 * Mux 0 is disconnected when idle, mux 1 idles with signal C
+	 * and mux 2 idles with signal A.
+	 */
+	&i2c0 {
+		mux: adg792a@50 {
+			compatible = "adi,adg792a";
+			reg = <0x50>;
+			#mux-control-cells = <1>;
+
+			adi,idle-high-impedance = <0>;
+			adi,idle-state = <1 2>, <2 0>;
+		};
+	};
+
+	adc-mux {
+		compatible = "io-channel-mux";
+		io-channels = <&adc 0>;
+		io-channel-names = "parent";
+
+		mux-controls = <&mux 1>;
+
+		channels = "sync-1", "", "out";
+	};
+
+
+	/*
+	 * Three parallel muxes with one mux controller, useful e.g. if
+	 * the adc is differential, thus needing two signals to be muxed
+	 * simultaneously for correct operation.
+	 */
+	&i2c0 {
+		pmux: adg792a@50 {
+			compatible = "adi,adg792a";
+			reg = <0x50>;
+			#mux-control-cells = <0>;
+			adi,parallel;
+		};
+	};
+
+	diff-adc-mux {
+		compatible = "io-channel-mux";
+		io-channels = <&adc 0>;
+		io-channel-names = "parent";
+
+		mux-controls = <&pmux>;
+
+		channels = "sync-1", "", "out";
+	};
-- 
2.1.4