On Mon, Apr 11, 2022 at 10:13:42PM +0900, Chan Kim wrote:
> Hi, Greg K-H,
> Thanks for replyaing.
> >
> > You ask the system for it. It depends on the bus type your driver is
> > written for for how to do this.
> >
> > For example, if you have a platform driver, you would call
> > platform_get_irq(). If you are a pci driver, the irq for your device is
> > already stored in the pci device structure passed into your probe
> function.
> >
> > What bus type is your driver written for?
> >
> That sounds very logical. In my case I added it to system bus.
What exactly do you mean by "system bus"?
> This is the qemu code making fdt.
>
> static void create_ab21q_axpu_device(const Ab21qMachineState *vms)
> {
> char *nodename;
> printf("create_ab21q_axpu_device called!\n");
> hwaddr base = vms->memmap[AB21Q_AXPU].base;
> hwaddr size = vms->memmap[AB21Q_AXPU].size;
> int irq = vms->irqmap[AB21Q_AXPU];
> const char compat[] = "ab21q-axpu";
>
> sysbus_create_simple("ab21q-axpu", base, qdev_get_gpio_in(vms->gic,
> irq));
>
> nodename = g_strdup_printf("/ab21q_axpu@%" PRIx64, base);
> qemu_fdt_add_subnode(vms->fdt, nodename);
> qemu_fdt_setprop(vms->fdt, nodename, "compatible", compat,
> sizeof(compat));
> qemu_fdt_setprop_sized_cells(vms->fdt, nodename, "reg", 2, base, 2,
> size);
> qemu_fdt_setprop_cells(vms->fdt, nodename, "interrupts",
> GIC_FDT_IRQ_TYPE_SPI, irq,
> GIC_FDT_IRQ_FLAGS_LEVEL_HI);
> qemu_fdt_setprop_cell(vms->fdt, nodename, "interrupt-parent",
> vms->gic_phandle);
>
> g_free(nodename);
This is qemu code, not kernel code.
> }
>
> I understand it creates the device axpu and connects its irq output to a
> gpio input connected to gic interrupt controller.
Again, this is qemu code, not kernel code.
> But this driver is not in the form of platform device/driver. (a char
> device). What function should I use to get the irq number in this case?
> I couldn't find a function with a likely name in the tags file for linux
> source.(5.4.188)
Where is your kernel code?
confused,
greg k-h
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