linux设备树实现多个中断父(interrupt-parent)节点

方法一：

•  interrupts-extended: 指定中断和父中断的另一种形式，允许多个父中断。这优先于'interrupts'和'interrupt-parent'。
  

#interrupt-cells = <2>;
interrupts-extended = <&gpio1 6 0>, <&gpio2 1 0>;

知识点：

描述产生中断的设备的节点必须包含“interrupts”属性或“interrupts-extended”属性，或者两者都包含。如果两者都存在，则后者应优先;提供前者可能只是为了与不识别后者的软件兼容。这些属性包含一个中断说明符列表，每个输出一个中断。中断说明符的格式由中断路由到的中断控制器决定。

Example:

interrupt-parent = <&intc1>;
interrupts = <5 0>, <6 0>;

“interrupt-parent”属性用于指定中断路由到的控制器，并包含一个指向中断控制器节点的phandle。此属性是继承的，因此可以在中断客户端节点或其任何父节点中指定。“Interrupts”属性中列出的中断总是引用节点的中断父节点。

当一个节点需要引用多个中断父节点时，“interrupts-extended”属性是一种特殊的形式。此属性中的每个条目都包含父phandle和中断说明符。"interrupts-extended"只能在设备有多个中断父节点时使用。

Example:

interrupts-extended = <&intc1 5 1>, <&intc2 1 0>;

 

方法二：

interrupts = <0 1 2>;
interrupt-map = <0 &intc 0 134 0
                 1 &intc 0 140 0
                 2 &spmi 0 0x9 0 0>;
interrupt-names = "core_irq", "async_irq", "pmic_id_irq";
interrupt-map-mask = <0 0 0 0>;

intc节点的#interrupt-cells值为<3>，spmi节点的#interrupt-cells值为4(这意味着需要在各自的phandles中使用不同的参数)。

interrupt-names字段是可选的，但是允许你通过名称而不是代码中的数字请求irq(例如，使用platform_get_irq_byname()而不是platform_get_irq())。

参考-->kernel document：

# cat Documentation/devicetree/bindings/gpio/brcm,brcmstb-gpio.txt
Broadcom STB "UPG GIO" GPIO controller

The controller's registers are organized as sets of eight 32-bit
registers with each set controlling a bank of up to 32 pins.  A single
interrupt is shared for all of the banks handled by the controller.

Required properties:

- compatible:
    Must be "brcm,brcmstb-gpio"

- reg:
    Define the base and range of the I/O address space containing
    the brcmstb GPIO controller registers

- #gpio-cells:
    Should be <2>.  The first cell is the pin number (within the controller's
    pin space), and the second is used for the following:
    bit[0]: polarity (0 for active-high, 1 for active-low)

- gpio-controller:
    Specifies that the node is a GPIO controller.

- brcm,gpio-bank-widths:
    Number of GPIO lines for each bank.  Number of elements must
    correspond to number of banks suggested by the 'reg' property.

Optional properties:

- interrupts:
    The interrupt shared by all GPIO lines for this controller.

- interrupt-parent:
    phandle of the parent interrupt controller

- interrupts-extended:
    Alternate form of specifying interrupts and parents that allows for
    multiple parents.  This takes precedence over 'interrupts' and
    'interrupt-parent'.  Wakeup-capable GPIO controllers often route their
    wakeup interrupt lines through a different interrupt controller than the
    primary interrupt line, making this property necessary.

- #interrupt-cells:
    Should be <2>.  The first cell is the GPIO number, the second should specify
    flags.  The following subset of flags is supported:
    - bits[3:0] trigger type and level flags
        1 = low-to-high edge triggered
        2 = high-to-low edge triggered
        4 = active high level-sensitive
        8 = active low level-sensitive
      Valid combinations are 1, 2, 3, 4, 8.
    See also Documentation/devicetree/bindings/interrupt-controller/interrupts.txt

- interrupt-controller:
    Marks the device node as an interrupt controller

- wakeup-source:
    GPIOs for this controller can be used as a wakeup source

Example:
        upg_gio: gpio@f040a700 {
                #gpio-cells = <2>;
                #interrupt-cells = <2>;
                compatible = "brcm,bcm7445-gpio", "brcm,brcmstb-gpio";
                gpio-controller;
                interrupt-controller;
                reg = <0xf040a700 0x80>;
                interrupt-parent = <&irq0_intc>;
                interrupts = <0x6>;
                brcm,gpio-bank-widths = <32 32 32 24>;
        };

        upg_gio_aon: gpio@f04172c0 {
                #gpio-cells = <2>;
                #interrupt-cells = <2>;
                compatible = "brcm,bcm7445-gpio", "brcm,brcmstb-gpio";
                gpio-controller;
                interrupt-controller;
                reg = <0xf04172c0 0x40>;
                interrupt-parent = <&irq0_aon_intc>;
                interrupts = <0x6>;
                interrupts-extended = <&irq0_aon_intc 0x6>,
                        <&aon_pm_l2_intc 0x5>;
                wakeup-source;
                brcm,gpio-bank-widths = <18 4>;
        };