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freebsd
GitHub Repository: freebsd/freebsd-src
 Path: blob/main/sys/contrib/device-tree/Bindings/gpio/gpio-74xx-mmio.txt
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* 74XX MMIO GPIO driver

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Required properties:

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- compatible: Should contain one of the following:

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   "ti,741g125": for 741G125 (1-bit Input),

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   "ti,741g174": for 741G74 (1-bit Output),

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   "ti,742g125": for 742G125 (2-bit Input),

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   "ti,7474"   : for 7474 (2-bit Output),

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   "ti,74125"  : for 74125 (4-bit Input),

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   "ti,74175"  : for 74175 (4-bit Output),

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   "ti,74365"  : for 74365 (6-bit Input),

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   "ti,74174"  : for 74174 (6-bit Output),

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   "ti,74244"  : for 74244 (8-bit Input),

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   "ti,74273"  : for 74273 (8-bit Output),

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   "ti,741624" : for 741624 (16-bit Input),

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   "ti,7416374": for 7416374 (16-bit Output).

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- reg: Physical base address and length where IC resides.

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- gpio-controller: Marks the device node as a gpio controller.

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- #gpio-cells: Should be two. The first cell is the pin number and

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   the second cell is used to specify the GPIO polarity:

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    0 = Active High,

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    1 = Active Low.

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Example:

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	ctrl: gpio@30008004 {

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		compatible = "ti,74174";

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		reg = <0x30008004 0x1>;

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		gpio-controller;

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		#gpio-cells = <2>;

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	};

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