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129 lines
2.6 KiB
129 lines
2.6 KiB
Generic register bitfield-based multiplexer controller bindings |
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Define register bitfields to be used to control multiplexers. The parent |
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device tree node must be a device node to provide register r/w access. |
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Required properties: |
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- compatible : should be one of |
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"reg-mux" : if parent device of mux controller is not syscon device |
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"mmio-mux" : if parent device of mux controller is syscon device |
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- #mux-control-cells : <1> |
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- mux-reg-masks : an array of register offset and pre-shifted bitfield mask |
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pairs, each describing a single mux control. |
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* Standard mux-controller bindings as decribed in mux-controller.txt |
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Optional properties: |
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- idle-states : if present, the state the muxes will have when idle. The |
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special state MUX_IDLE_AS_IS is the default. |
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The multiplexer state of each multiplexer is defined as the value of the |
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bitfield described by the corresponding register offset and bitfield mask |
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pair in the mux-reg-masks array. |
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Example 1: |
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The parent device of mux controller is not a syscon device. |
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&i2c0 { |
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fpga@66 { // fpga connected to i2c |
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compatible = "fsl,lx2160aqds-fpga", "fsl,fpga-qixis-i2c", |
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"simple-mfd"; |
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reg = <0x66>; |
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mux: mux-controller { |
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compatible = "reg-mux"; |
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#mux-control-cells = <1>; |
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mux-reg-masks = <0x54 0xf8>, /* 0: reg 0x54, bits 7:3 */ |
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<0x54 0x07>; /* 1: reg 0x54, bits 2:0 */ |
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}; |
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}; |
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}; |
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mdio-mux-1 { |
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compatible = "mdio-mux-multiplexer"; |
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mux-controls = <&mux 0>; |
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mdio-parent-bus = <&emdio1>; |
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#address-cells = <1>; |
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#size-cells = <0>; |
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mdio@0 { |
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reg = <0x0>; |
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#address-cells = <1>; |
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#size-cells = <0>; |
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}; |
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mdio@8 { |
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reg = <0x8>; |
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#address-cells = <1>; |
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#size-cells = <0>; |
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}; |
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.. |
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.. |
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}; |
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mdio-mux-2 { |
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compatible = "mdio-mux-multiplexer"; |
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mux-controls = <&mux 1>; |
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mdio-parent-bus = <&emdio2>; |
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#address-cells = <1>; |
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#size-cells = <0>; |
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mdio@0 { |
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reg = <0x0>; |
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#address-cells = <1>; |
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#size-cells = <0>; |
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}; |
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mdio@1 { |
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reg = <0x1>; |
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#address-cells = <1>; |
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#size-cells = <0>; |
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}; |
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.. |
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.. |
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}; |
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Example 2: |
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The parent device of mux controller is syscon device. |
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syscon { |
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compatible = "syscon"; |
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mux: mux-controller { |
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compatible = "mmio-mux"; |
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#mux-control-cells = <1>; |
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mux-reg-masks = <0x3 0x30>, /* 0: reg 0x3, bits 5:4 */ |
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<0x3 0x40>, /* 1: reg 0x3, bit 6 */ |
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idle-states = <MUX_IDLE_AS_IS>, <0>; |
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}; |
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}; |
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video-mux { |
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compatible = "video-mux"; |
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mux-controls = <&mux 0>; |
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#address-cells = <1>; |
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#size-cells = <0>; |
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ports { |
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/* inputs 0..3 */ |
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port@0 { |
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reg = <0>; |
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}; |
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port@1 { |
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reg = <1>; |
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}; |
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port@2 { |
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reg = <2>; |
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}; |
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port@3 { |
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reg = <3>; |
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}; |
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/* output */ |
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port@4 { |
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reg = <4>; |
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}; |
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}; |
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};
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