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AM5708: linux内核中,为什么ipu的watchdog-timers 要分配两个定时器,而DSP上只用一个

Part Number: AM5708


&ipu2 {
    status = "okay";
    memory-region = <&ipu2_cma_pool>;
    mboxes = <&mailbox6 &mbox_ipu2_ipc3x>;
    timers = <&timer3>;
    watchdog-timers = <&timer4>, <&timer9>;
};

&ipu1 {
    status = "okay";
    memory-region = <&ipu1_cma_pool>;
    mboxes = <&mailbox5 &mbox_ipu1_ipc3x>;
    timers = <&timer11>;
    watchdog-timers = <&timer7>, <&timer8>;
};
&dsp1 {
    status = "okay";
    memory-region = <&dsp1_cma_pool>;
    mboxes = <&mailbox5 &mbox_dsp1_ipc3x>;
    timers = <&timer5>;
    watchdog-timers = <&timer10>;
};
这在手册里有说明么,是ipu必须要用两个么?
没有用的定时器,可以随意分配么?
MPU中必须使用哪几个定时器呢?