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A question about the irq  registration between SDK1.6 and SDK2.0

Question asked by zhang yunfei on Jul 8, 2019

    Dear sir.
We are using B4860qds. Now we want to update the SDK from SDK1.6 to SDK2.0. In the SDK1.6 version we use the MPIC Core 0 to interrupt. When DSP writes 1 to the MPIC_IPIDR3 register, an interrupt occurs to linux kernel.The irq requested as follows:


#define IPID3_IRQ_NUM 510

np = of_find_node_by_name(NULL, "pic");

irqhost = irq_find_host(np);

vipi = irq_find_mapping(irqhost, IPID3_IRQ_NUM);

    if (NO_IRQ == vipi) {

        vipi = irq_create_mapping(irqhost, IPID3_IRQ_NUM);


request_irq(IPID3_IRQ_NUM, follow_dsp_isr, IRQF_NO_SUSPEND, "follow_dsp_isr", NULL);



 It works well on SDK1.6.

When we use the same code on SDK2.0,the problem occurs.After irq requests,we use “cat /proc/intterupts”to find as follows:

510: 0   0   0   0    0    0    0    0   OpenPIC   510 Edge dsp_isr

When DSP writes 1 to the MPIC_IPIDR3 register,linux kernel can no longer receive interrupts.

So I'd like to ask you a question. If we don’t use device tree,how do I calculate the irq number? And is anyting different between SDK1.6 and SDK2.0 in the irq registration?