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1* 74XX MMIO GPIO driver2 3Required properties:4- compatible: Should contain one of the following:5 "ti,741g125": for 741G125 (1-bit Input),6 "ti,741g174": for 741G74 (1-bit Output),7 "ti,742g125": for 742G125 (2-bit Input),8 "ti,7474" : for 7474 (2-bit Output),9 "ti,74125" : for 74125 (4-bit Input),10 "ti,74175" : for 74175 (4-bit Output),11 "ti,74365" : for 74365 (6-bit Input),12 "ti,74174" : for 74174 (6-bit Output),13 "ti,74244" : for 74244 (8-bit Input),14 "ti,74273" : for 74273 (8-bit Output),15 "ti,741624" : for 741624 (16-bit Input),16 "ti,7416374": for 7416374 (16-bit Output).17- reg: Physical base address and length where IC resides.18- gpio-controller: Marks the device node as a gpio controller.19- #gpio-cells: Should be two. The first cell is the pin number and20 the second cell is used to specify the GPIO polarity:21 0 = Active High,22 1 = Active Low.23 24Example:25 ctrl: gpio@30008004 {26 compatible = "ti,74174";27 reg = <0x30008004 0x1>;28 gpio-controller;29 #gpio-cells = <2>;30 };31