doc/device-tree-bindings/gpio/intel,apl-gpio.txt

   1 Intel Apollo Lake GPIO controller
   2
   3 The Apollo Lake (APL) GPIO controller is used to control GPIO functions of
   4 the pins.
   5
   6 Required properties:
   7 - compatible: "intel,apl-gpio"
   8 - #gpio-cells: Should be 2. The syntax of the gpio specifier used by client
   9   nodes should be the following with values derived from the SoC user manual.
  10      <[phandle of the gpio controller node]
  11       [pin number within the gpio controller]
  12       [flags]>
  13
  14   Values for gpio specifier:
  15   - Pin number: is a GPIO pin number between 0 and 244
  16   - Flags: GPIO_ACTIVE_HIGH or GPIO_ACTIVE_LOW
  17
  18 - gpio-controller: Specifies that the node is a gpio controller.
  19
  20 Example:
  21
  22 ...
  23 {
  24         p2sb: p2sb@d,0 {
  25                 reg = <0x02006810 0 0 0 0>;
  26                 compatible = "intel,p2sb";
  27                 early-regs = <IOMAP_P2SB_BAR 0x100000>;
  28
  29                 north {
  30                         compatible = "intel,apl-pinctrl";
  31                         intel,p2sb-port-id = <PID_GPIO_N>;
  32                         gpio_n: gpio-n {
  33                                 compatible = "intel,gpio";
  34                                 gpio-controller;
  35                                 #gpio-cells = <2>;
  36                         };
  37                 };
  38         };
  39
  40         i2c_2: i2c2@16,2 {
  41                 compatible = "intel,apl-i2c", "snps,designware-i2c-pci";
  42                 reg = <0x0200b210 0 0 0 0>;
  43                 #address-cells = <1>;
  44                 #size-cells = <0>;
  45                 clock-frequency = <400000>;
  46                 tpm@50 {
  47                         reg = <0x50>;
  48                         compatible = "google,cr50";
  49                         u-boot,i2c-offset-len = <0>;
  50                         ready-gpios = <&gpio_n GPIO_28 GPIO_ACTIVE_LOW>;
  51                 };
  52         };
  53
  54 };
  55 ...