gpio-axp209.txt

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    1 AXP209 GPIO & pinctrl controller
    2 
    3 This driver follows the usual GPIO bindings found in
    4 Documentation/devicetree/bindings/gpio/gpio.txt
    5 
    6 This driver follows the usual pinctrl bindings found in
    7 Documentation/devicetree/bindings/pinctrl/pinctrl-bindings.txt
    8 
    9 This driver employs the per-pin muxing pattern.
   10 
   11 Required properties:
   12 - compatible: Should be one of:
   13         - "x-powers,axp209-gpio"
   14         - "x-powers,axp813-gpio"
   15 - #gpio-cells: Should be two. The first cell is the pin number and the
   16   second is the GPIO flags.
   17 - gpio-controller: Marks the device node as a GPIO controller.
   18 
   19 This node must be a subnode of the axp20x PMIC, documented in
   20 Documentation/devicetree/bindings/mfd/axp20x.txt
   21 
   22 Example:
   23 
   24 axp209: pmic@34 {
   25         compatible = "x-powers,axp209";
   26         reg = <0x34>;
   27         interrupt-parent = <&nmi_intc>;
   28         interrupts = <0 IRQ_TYPE_LEVEL_LOW>;
   29         interrupt-controller;
   30         #interrupt-cells = <1>;
   31 
   32         axp_gpio: gpio {
   33                 compatible = "x-powers,axp209-gpio";
   34                 gpio-controller;
   35                 #gpio-cells = <2>;
   36         };
   37 };
   38 
   39 The GPIOs can be muxed to other functions and therefore, must be a subnode of
   40 axp_gpio.
   41 
   42 Example:
   43 
   44 &axp_gpio {
   45         gpio0_adc: gpio0-adc {
   46                 pins = "GPIO0";
   47                 function = "adc";
   48         };
   49 };
   50 
   51 &example_node {
   52         pinctrl-names = "default";
   53         pinctrl-0 = <&gpio0_adc>;
   54 };
   55 
   56 GPIOs and their functions
   57 -------------------------
   58 
   59 Each GPIO is independent from the other (i.e. GPIO0 in gpio_in function does
   60 not force GPIO1 and GPIO2 to be in gpio_in function as well).
   61 
   62 axp209
   63 ------
   64 GPIO    |       Functions
   65 ------------------------
   66 GPIO0   |       gpio_in, gpio_out, ldo, adc
   67 GPIO1   |       gpio_in, gpio_out, ldo, adc
   68 GPIO2   |       gpio_in, gpio_out
   69 
   70 axp813
   71 ------
   72 GPIO    |       Functions
   73 ------------------------
   74 GPIO0   |       gpio_in, gpio_out, ldo, adc
   75 GPIO1   |       gpio_in, gpio_out, ldo

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sys/contrib/device-tree/Bindings/gpio/gpio-axp209.txt