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94 lines
2.4 KiB
Plaintext
94 lines
2.4 KiB
Plaintext
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One-register-per-pin type device tree based pinctrl driver
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Required properties:
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- compatible : "pinctrl-single"
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- reg : offset and length of the register set for the mux registers
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- pinctrl-single,register-width : pinmux register access width in bits
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- pinctrl-single,function-mask : mask of allowed pinmux function bits
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in the pinmux register
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Optional properties:
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- pinctrl-single,function-off : function off mode for disabled state if
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available and same for all registers; if not specified, disabling of
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pin functions is ignored
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This driver assumes that there is only one register for each pin,
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and uses the common pinctrl bindings as specified in the pinctrl-bindings.txt
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document in this directory.
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The pin configuration nodes for pinctrl-single are specified as pinctrl
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register offset and value pairs using pinctrl-single,pins. Only the bits
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specified in pinctrl-single,function-mask are updated. For example, setting
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a pin for a device could be done with:
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pinctrl-single,pins = <0xdc 0x118>;
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Where 0xdc is the offset from the pinctrl register base address for the
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device pinctrl register, and 0x118 contains the desired value of the
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pinctrl register. See the device example and static board pins example
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below for more information.
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Example:
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/* SoC common file */
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/* first controller instance for pins in core domain */
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pmx_core: pinmux@4a100040 {
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compatible = "pinctrl-single";
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reg = <0x4a100040 0x0196>;
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#address-cells = <1>;
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#size-cells = <0>;
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pinctrl-single,register-width = <16>;
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pinctrl-single,function-mask = <0xffff>;
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};
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/* second controller instance for pins in wkup domain */
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pmx_wkup: pinmux@4a31e040 {
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compatible = "pinctrl-single;
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reg = <0x4a31e040 0x0038>;
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#address-cells = <1>;
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#size-cells = <0>;
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pinctrl-single,register-width = <16>;
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pinctrl-single,function-mask = <0xffff>;
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};
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/* board specific .dts file */
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&pmx_core {
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/*
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* map all board specific static pins enabled by the pinctrl driver
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* itself during the boot (or just set them up in the bootloader)
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*/
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pinctrl-names = "default";
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pinctrl-0 = <&board_pins>;
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board_pins: pinmux_board_pins {
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pinctrl-single,pins = <
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0x6c 0xf
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0x6e 0xf
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0x70 0xf
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0x72 0xf
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>;
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};
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/* map uart2 pins */
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uart2_pins: pinmux_uart2_pins {
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pinctrl-single,pins = <
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0xd8 0x118
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0xda 0
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0xdc 0x118
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0xde 0
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>;
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};
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};
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&uart2 {
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pinctrl-names = "default";
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pinctrl-0 = <&uart2_pins>;
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};
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