1UniPhier GPIO controller
2
3Required properties:
4- compatible: Should be "socionext,uniphier-gpio".
5- reg: Specifies offset and length of the register set for the device.
6- gpio-controller: Marks the device node as a GPIO controller.
7- #gpio-cells: Should be 2.  The first cell is the pin number and the second
8  cell is used to specify optional parameters.
9- interrupt-controller: Marks the device node as an interrupt controller.
10- #interrupt-cells: Should be 2.  The first cell defines the interrupt number.
11  The second cell bits[3:0] is used to specify trigger type as follows:
12    1 = low-to-high edge triggered
13    2 = high-to-low edge triggered
14    4 = active high level-sensitive
15    8 = active low level-sensitive
16  Valid combinations are 1, 2, 3, 4, 8.
17- ngpios: Specifies the number of GPIO lines.
18- gpio-ranges: Mapping to pin controller pins (as described in gpio.txt)
19- socionext,interrupt-ranges: Specifies an interrupt number mapping between
20  this GPIO controller and its interrupt parent, in the form of arbitrary
21  number of <child-interrupt-base parent-interrupt-base length> triplets.
22
23Optional properties:
24- gpio-ranges-group-names: Used for named gpio ranges (as described in gpio.txt)
25
26Example:
27	gpio: gpio@55000000 {
28		compatible = "socionext,uniphier-gpio";
29		reg = <0x55000000 0x200>;
30		interrupt-parent = <&aidet>;
31		interrupt-controller;
32		#interrupt-cells = <2>;
33		gpio-controller;
34		#gpio-cells = <2>;
35		gpio-ranges = <&pinctrl 0 0 0>;
36		gpio-ranges-group-names = "gpio_range";
37		ngpios = <248>;
38		socionext,interrupt-ranges = <0 48 16>, <16 154 5>, <21 217 3>;
39	};
40
41Consumer Example:
42
43	sdhci0_pwrseq {
44		compatible = "mmc-pwrseq-emmc";
45		reset-gpios = <&gpio UNIPHIER_GPIO_PORT(29, 4) GPIO_ACTIVE_LOW>;
46	};
47
48Please note UNIPHIER_GPIO_PORT(29, 4) represents PORT294 in the SoC document.
49Unfortunately, only the one's place is octal in the port numbering.  (That is,
50PORT 8, 9, 18, 19, 28, 29, ... are missing.)  UNIPHIER_GPIO_PORT() is a helper
51macro to calculate 29 * 8 + 4.
52