Documentation/devicetree/bindings/pinctrl/allwinner,sunxi-pinctrl.txt

   1 * Allwinner A1X Pin Controller
   2
   3 The pins controlled by sunXi pin controller are organized in banks,
   4 each bank has 32 pins.  Each pin has 7 multiplexing functions, with
   5 the first two functions being GPIO in and out. The configuration on
   6 the pins includes drive strength and pull-up.
   7
   8 Required properties:
   9 - compatible: Should be one of the following (depending on your SoC):
  10   "allwinner,sun4i-a10-pinctrl"
  11   "allwinner,sun5i-a10s-pinctrl"
  12   "allwinner,sun5i-a13-pinctrl"
  13   "allwinner,sun6i-a31-pinctrl"
  14   "allwinner,sun6i-a31s-pinctrl"
  15   "allwinner,sun6i-a31-r-pinctrl"
  16   "allwinner,sun7i-a20-pinctrl"
  17   "allwinner,sun8i-a23-pinctrl"
  18   "allwinner,sun8i-a23-r-pinctrl"
  19   "allwinner,sun8i-a33-pinctrl"
  20   "allwinner,sun9i-a80-pinctrl"
  21   "allwinner,sun9i-a80-r-pinctrl"
  22   "allwinner,sun8i-a83t-pinctrl"
  23   "allwinner,sun8i-a83t-r-pinctrl"
  24   "allwinner,sun8i-h3-pinctrl"
  25   "allwinner,sun8i-h3-r-pinctrl"
  26   "allwinner,sun8i-r40-pinctrl"
  27   "allwinner,sun50i-a64-pinctrl"
  28   "allwinner,sun50i-a64-r-pinctrl"
  29   "allwinner,sun50i-h5-pinctrl"
  30   "nextthing,gr8-pinctrl"
  31
  32 - reg: Should contain the register physical address and length for the
  33   pin controller.
  34
  35 - clocks: phandle to the clocks feeding the pin controller:
  36   - "apb": the gated APB parent clock
  37   - "hosc": the high frequency oscillator in the system
  38   - "losc": the low frequency oscillator in the system
  39
  40 Note: For backward compatibility reasons, the hosc and losc clocks are only
  41 required if you need to use the optional input-debounce property. Any new
  42 device tree should set them.
  43
  44 Optional properties:
  45   - input-debounce: Array of debouncing periods in microseconds. One period per
  46     irq bank found in the controller. 0 if no setup required.
  47
  48
  49 Please refer to pinctrl-bindings.txt in this directory for details of the
  50 common pinctrl bindings used by client devices.
  51
  52 A pinctrl node should contain at least one subnodes representing the
  53 pinctrl groups available on the machine. Each subnode will list the
  54 pins it needs, and how they should be configured, with regard to muxer
  55 configuration, drive strength and pullups. If one of these options is
  56 not set, its actual value will be unspecified.
  57
  58 This driver supports the generic pin multiplexing and configuration
  59 bindings. For details on each properties, you can refer to
  60 ./pinctrl-bindings.txt.
  61
  62 Required sub-node properties:
  63   - pins
  64   - function
  65
  66 Optional sub-node properties:
  67   - bias-disable
  68   - bias-pull-up
  69   - bias-pull-down
  70   - drive-strength
  71
  72 *** Deprecated pin configuration and multiplexing binding
  73
  74 Required subnode-properties:
  75
  76 - allwinner,pins: List of strings containing the pin name.
  77 - allwinner,function: Function to mux the pins listed above to.
  78
  79 Optional subnode-properties:
  80 - allwinner,drive: Integer. Represents the current sent to the pin
  81     0: 10 mA
  82     1: 20 mA
  83     2: 30 mA
  84     3: 40 mA
  85 - allwinner,pull: Integer.
  86     0: No resistor
  87     1: Pull-up resistor
  88     2: Pull-down resistor
  89
  90 Examples:
  91
  92 pio: pinctrl@1c20800 {
  93         compatible = "allwinner,sun5i-a13-pinctrl";
  94         reg = <0x01c20800 0x400>;
  95         #address-cells = <1>;
  96         #size-cells = <0>;
  97
  98         uart1_pins_a: uart1@0 {
  99                 allwinner,pins = "PE10", "PE11";
 100                 allwinner,function = "uart1";
 101                 allwinner,drive = <0>;
 102                 allwinner,pull = <0>;
 103         };
 104
 105         uart1_pins_b: uart1@1 {
 106                 allwinner,pins = "PG3", "PG4";
 107                 allwinner,function = "uart1";
 108                 allwinner,drive = <0>;
 109                 allwinner,pull = <0>;
 110         };
 111 };
 112
 113
 114 GPIO and interrupt controller
 115 -----------------------------
 116
 117 This hardware also acts as a GPIO controller and an interrupt
 118 controller.
 119
 120 Consumers that would want to refer to one or the other (or both)
 121 should provide through the usual *-gpios and interrupts properties a
 122 cell with 3 arguments, first the number of the bank, then the pin
 123 inside that bank, and finally the flags for the GPIO/interrupts.
 124
 125 Example:
 126
 127 xio: gpio@38 {
 128         compatible = "nxp,pcf8574a";
 129         reg = <0x38>;
 130
 131         gpio-controller;
 132         #gpio-cells = <2>;
 133
 134         interrupt-parent = <&pio>;
 135         interrupts = <6 0 IRQ_TYPE_EDGE_FALLING>;
 136         interrupt-controller;
 137         #interrupt-cells = <2>;
 138 };
 139
 140 reg_usb1_vbus: usb1-vbus {
 141         compatible = "regulator-fixed";
 142         regulator-name = "usb1-vbus";
 143         regulator-min-microvolt = <5000000>;
 144         regulator-max-microvolt = <5000000>;
 145         gpio = <&pio 7 6 GPIO_ACTIVE_HIGH>;
 146 };