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linux设备树实现多个中断父(interrupt-parent)节点

来源：博客园


(相关资料图)

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.txtBroadcom STB "UPG GIO" GPIO controllerThe controller"s registers are organized as sets of eight 32-bitregisters with each set controlling a bank of up to 32 pins.  A singleinterrupt 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 sourceExample:        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>;        };

关键词： 中断控制器 因此可以