device-tree-bindings/gpio/gpio.txt

11 	single-gpio ::= <gpio-phandle> <gpio-specifier>
13 	gpio-specifier : Array of #gpio-cells specifying specific gpio
49 Note that gpio-specifier length is controller dependent.  In the
53 gpio-specifier may encode: bank, pin position inside the bank,
55 Exact meaning of each specifier cell is controller specific, and must
65 GPIO_ACTIVE_HIGH is 0, so in this example gpio-specifier is "18 0" and encodes
68 1.1) GPIO specifier best practices
71 A gpio-specifier should contain a flag indicating the GPIO polarity; active-
75 The gpio-specifier's polarity flag should represent the physical level at the
79 the GPIO controller and the device, then the gpio-specifier will represent the
97 In particular, the polarity cannot be derived from the gpio-specifier, since
105 in the binding. The gpio-specifier should represent the polarity of the signal
117 cells in a gpio-specifier.