Documentation/devicetree/bindings/pinctrl/brcm,nsp-gpio.txt

   1 Broadcom Northstar plus (NSP) GPIO/PINCONF Controller
   2
   3 Required properties:
   4 - compatible:
   5     Must be "brcm,nsp-gpio-a"
   6
   7 - reg:
   8     Should contain the register physical address and length for each of
   9     GPIO base, IO control registers
  10
  11 - #gpio-cells:
  12     Must be two. The first cell is the GPIO pin number (within the
  13     controller's pin space) and the second cell is used for the following:
  14     bit[0]: polarity (0 for active high and 1 for active low)
  15
  16 - gpio-controller:
  17     Specifies that the node is a GPIO controller
  18
  19 - ngpios:
  20     Number of gpios supported (58x25 supports 32 and 58x23 supports 24)
  21
  22 Optional properties:
  23 - interrupts:
  24     Interrupt ID
  25
  26 - interrupt-controller:
  27     Specifies that the node is an interrupt controller
  28
  29 - gpio-ranges:
  30     Specifies the mapping between gpio controller and pin-controllers pins.
  31     This requires 4 fields in cells defined as -
  32     1. Phandle of pin-controller.
  33     2. GPIO base pin offset.
  34     3  Pin-control base pin offset.
  35     4. number of gpio pins which are linearly mapped from pin base.
  36
  37 Supported generic PINCONF properties in child nodes:
  38 - pins:
  39     The list of pins (within the controller's own pin space) that properties
  40     in the node apply to. Pin names are "gpio-<pin>"
  41
  42 - bias-disable:
  43     Disable pin bias
  44
  45 - bias-pull-up:
  46     Enable internal pull up resistor
  47
  48 - bias-pull-down:
  49     Enable internal pull down resistor
  50
  51 - drive-strength:
  52     Valid drive strength values include 2, 4, 6, 8, 10, 12, 14, 16 (mA)
  53
  54 Example:
  55
  56         gpioa: gpio@18000020 {
  57                 compatible = "brcm,nsp-gpio-a";
  58                 reg = <0x18000020 0x100>,
  59                       <0x1803f1c4 0x1c>;
  60                 #gpio-cells = <2>;
  61                 gpio-controller;
  62                 ngpios = <32>;
  63                 gpio-ranges = <&pinctrl 0 0 31>;
  64                 interrupt-controller;
  65                 interrupts = <GIC_SPI 85 IRQ_TYPE_LEVEL_HIGH>;
  66
  67                 /* Hog a few default settings */
  68                 pinctrl-names = "default";
  69                 pinctrl-0 = <&led>;
  70                 led: led {
  71                         pins = "gpio-1";
  72                         bias-pull-up;
  73                 };
  74
  75                 pwr: pwr {
  76                         gpio-hog;
  77                         gpios = <3 1>;
  78                         output-high;
  79                 };
  80         };