From 5dc75a2d93d52617d50d72f8c056eb3b8f80ba62 Mon Sep 17 00:00:00 2001 From: Philipp Zabel Date: Sun, 14 May 2017 21:51:15 +0200 Subject: [PATCH] dt-bindings: add mmio-based syscon mux controller DT bindings 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 Acked-by: Rob Herring Signed-off-by: Peter Rosin Signed-off-by: Greg Kroah-Hartman --- .../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 = , <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>; + }; + }; + }; -- 2.20.1