Documentation/devicetree/bindings/gpio/gpio-tz1090.txt

   1 ImgTec TZ1090 GPIO Controller
   2
   3 Required properties:
   4 - compatible: Compatible property value should be "img,tz1090-gpio".
   5
   6 - reg: Physical base address of the controller and length of memory mapped
   7   region.
   8
   9 - #address-cells: Should be 1 (for bank subnodes)
  10
  11 - #size-cells: Should be 0 (for bank subnodes)
  12
  13 - Each bank of GPIOs should have a subnode to represent it.
  14
  15   Bank subnode required properties:
  16   - reg: Index of bank in the range 0 to 2.
  17
  18   - gpio-controller: Specifies that the node is a gpio controller.
  19
  20   - #gpio-cells: Should be 2. The syntax of the gpio specifier used by client
  21     nodes should have the following values.
  22        <[phandle of the gpio controller node]
  23         [gpio number within the gpio bank]
  24         [gpio flags]>
  25
  26     Values for gpio specifier:
  27     - GPIO number: a value in the range 0 to 29.
  28     - GPIO flags: bit field of flags, as defined in <dt-bindings/gpio/gpio.h>.
  29       Only the following flags are supported:
  30         GPIO_ACTIVE_HIGH
  31         GPIO_ACTIVE_LOW
  32
  33   Bank subnode optional properties:
  34   - gpio-ranges: Mapping to pin controller pins (as described in
  35     Documentation/devicetree/bindings/gpio/gpio.txt)
  36
  37   - interrupts: Interrupt for the entire bank
  38
  39   - interrupt-controller: Specifies that the node is an interrupt controller
  40
  41   - #interrupt-cells: Should be 2. The syntax of the interrupt specifier used by
  42     client nodes should have the following values.
  43        <[phandle of the interurupt controller]
  44         [gpio number within the gpio bank]
  45         [irq flags]>
  46
  47     Values for irq specifier:
  48     - GPIO number: a value in the range 0 to 29
  49     - IRQ flags: value to describe edge and level triggering, as defined in
  50       <dt-bindings/interrupt-controller/irq.h>. Only the following flags are
  51       supported:
  52         IRQ_TYPE_EDGE_RISING
  53         IRQ_TYPE_EDGE_FALLING
  54         IRQ_TYPE_EDGE_BOTH
  55         IRQ_TYPE_LEVEL_HIGH
  56         IRQ_TYPE_LEVEL_LOW
  57
  58
  59
  60 Example:
  61
  62         gpios: gpio-controller@02005800 {
  63                 #address-cells = <1>;
  64                 #size-cells = <0>;
  65                 compatible = "img,tz1090-gpio";
  66                 reg = <0x02005800 0x90>;
  67
  68                 /* bank 0 with an interrupt */
  69                 gpios0: bank@0 {
  70                         #gpio-cells = <2>;
  71                         #interrupt-cells = <2>;
  72                         reg = <0>;
  73                         interrupts = <13 IRQ_TYPE_LEVEL_HIGH>;
  74                         gpio-controller;
  75                         gpio-ranges = <&pinctrl 0 0 30>;
  76                         interrupt-controller;
  77                 };
  78
  79                 /* bank 2 without interrupt */
  80                 gpios2: bank@2 {
  81                         #gpio-cells = <2>;
  82                         reg = <2>;
  83                         gpio-controller;
  84                         gpio-ranges = <&pinctrl 0 60 30>;
  85                 };
  86         };
  87
  88