gpio-xgene-sb.txt

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    1 APM X-Gene Standby GPIO controller bindings
    2 
    3 This is a gpio controller in the standby domain. It also supports interrupt in
    4 some particular pins which are sourced to its parent interrupt controller
    5 as diagram below:
    6                             +-----------------+
    7                             | X-Gene standby  |
    8                             | GPIO controller +------ GPIO_0
    9 +------------+              |                 | ...
   10 | Parent IRQ | EXT_INT_0    |                 +------ GPIO_8/EXT_INT_0
   11 | controller | (SPI40)      |                 | ...
   12 | (GICv2)    +--------------+                 +------ GPIO_[N+8]/EXT_INT_N
   13 |            |   ...        |                 |
   14 |            | EXT_INT_N    |                 +------ GPIO_[N+9]
   15 |            | (SPI[40 + N])|                 | ...
   16 |            +--------------+                 +------ GPIO_MAX
   17 +------------+              +-----------------+
   18 
   19 Required properties:
   20 - compatible: "apm,xgene-gpio-sb" for the X-Gene Standby GPIO controller
   21 - reg: Physical base address and size of the controller's registers
   22 - #gpio-cells: Should be two.
   23         - first cell is the pin number
   24         - second cell is used to specify the gpio polarity:
   25                 0 = active high
   26                 1 = active low
   27 - gpio-controller: Marks the device node as a GPIO controller.
   28 - interrupts: The EXT_INT_0 parent interrupt resource must be listed first.
   29 - interrupt-cells: Should be two.
   30        - first cell is 0-N coresponding for EXT_INT_0 to EXT_INT_N.
   31        - second cell is used to specify flags.
   32 - interrupt-controller: Marks the device node as an interrupt controller.
   33 - apm,nr-gpios: Optional, specify number of gpios pin.
   34 - apm,nr-irqs: Optional, specify number of interrupt pins.
   35 - apm,irq-start: Optional, specify lowest gpio pin support interrupt.
   36 
   37 Example:
   38         sbgpio: gpio@17001000{
   39                 compatible = "apm,xgene-gpio-sb";
   40                 reg = <0x0 0x17001000 0x0 0x400>;
   41                 #gpio-cells = <2>;
   42                 gpio-controller;
   43                 interrupts =    <0x0 0x28 0x1>,
   44                                 <0x0 0x29 0x1>,
   45                                 <0x0 0x2a 0x1>,
   46                                 <0x0 0x2b 0x1>,
   47                                 <0x0 0x2c 0x1>,
   48                                 <0x0 0x2d 0x1>;
   49                 interrupt-parent = <&gic>;
   50                 #interrupt-cells = <2>;
   51                 interrupt-controller;
   52                 apm,nr-gpios = <22>;
   53                 apm,nr-irqs = <6>;
   54                 apm,irq-start = <8>;
   55         };
   56 
   57         testuser {
   58                 compatible = "example,testuser";
   59                 /* Use the GPIO_13/EXT_INT_5 line as an active high triggered
   60                  * level interrupt
   61                  */
   62                 interrupts = <5 4>;
   63                 interrupt-parent = <&sbgpio>;
   64         };

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sys/contrib/device-tree/Bindings/gpio/gpio-xgene-sb.txt