linux-kernel - [PATCH v15 12/13] dt-bindings: add mmio-based syscon mux controller DT bindings

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Date:   Sun, 14 May 2017 21:51:15 +0200
From:   Peter Rosin <peda@...ator.liu.se>
To:     linux-kernel@...r.kernel.org,
        Greg Kroah-Hartman <gregkh@...uxfoundation.org>
Cc:     Philipp Zabel <p.zabel@...gutronix.de>,
        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>, linux-i2c@...r.kernel.org,
        devicetree@...r.kernel.org, linux-iio@...r.kernel.org,
        linux-doc@...r.kernel.org,
        Andrew Morton <akpm@...ux-foundation.org>,
        Colin Ian King <colin.king@...onical.com>,
        Paul Gortmaker <paul.gortmaker@...driver.com>,
        kernel@...gutronix.de
Subject: [PATCH v15 12/13] dt-bindings: add mmio-based syscon mux controller DT bindings

From: Philipp Zabel <p.zabel@...gutronix.de>

This adds device tree binding documentation for mmio-based syscon
multiplexers controlled by a bitfields in a syscon register range.

Signed-off-by: Philipp Zabel <p.zabel@...gutronix.de>
Acked-by: Rob Herring <robh@...nel.org>
Signed-off-by: Peter Rosin <peda@...ntia.se>
---
 Documentation/devicetree/bindings/mux/mmio-mux.txt | 60 ++++++++++++++++++++++
 1 file changed, 60 insertions(+)
 create mode 100644 Documentation/devicetree/bindings/mux/mmio-mux.txt

diff --git a/Documentation/devicetree/bindings/mux/mmio-mux.txt b/Documentation/devicetree/bindings/mux/mmio-mux.txt
new file mode 100644
index 000000000000..a9bfb4d8b6ac
--- /dev/null
+++ b/Documentation/devicetree/bindings/mux/mmio-mux.txt
@@ -0,0 +1,60 @@
+MMIO register bitfield-based multiplexer controller bindings
+
+Define register bitfields to be used to control multiplexers. The parent
+device tree node must be a syscon node to provide register access.
+
+Required properties:
+- compatible : "mmio-mux"
+- #mux-control-cells : <1>
+- mux-reg-masks : an array of register offset and pre-shifted bitfield mask
+                  pairs, each describing a single mux control.
+* Standard mux-controller bindings as decribed in mux-controller.txt
+
+Optional properties:
+- idle-states : if present, the state the muxes will have when idle. The
+		special state MUX_IDLE_AS_IS is the default.
+
+The multiplexer state of each multiplexer is defined as the value of the
+bitfield described by the corresponding register offset and bitfield mask pair
+in the mux-reg-masks array, accessed through the parent syscon.
+
+Example:
+
+	syscon {
+		compatible = "syscon";
+
+		mux: mux-controller {
+			compatible = "mmio-mux";
+			#mux-control-cells = <1>;
+
+			mux-reg-masks = <0x3 0x30>, /* 0: reg 0x3, bits 5:4 */
+					<0x3 0x40>, /* 1: reg 0x3, bit 6 */
+			idle-states = <MUX_IDLE_AS_IS>, <0>;
+		};
+	};
+
+	video-mux {
+		compatible = "video-mux";
+		mux-controls = <&mux 0>;
+
+		ports {
+			/* inputs 0..3 */
+			port@0 {
+				reg = <0>;
+			};
+			port@1 {
+				reg = <1>;
+			};
+			port@2 {
+				reg = <2>;
+			};
+			port@3 {
+				reg = <3>;
+			};
+
+			/* output */
+			port@4 {
+				reg = <4>;
+			};
+		};
+	};
-- 
2.1.4