I have a problem, return to the -22 error in the request_irq function call.
Register interrupt device is the FPGA side PushButton, offset address is 0x000100c0
The following is the content of the button_pio device tree.
The priority of button_pio is FPGA_IRQ5,Find in Handbook,
The 77 is the corresponding interrupt number(#define FPGA_BUTTON_DSR_IRQ 77).
button_pio: gpio@0x1000100C0 {compatible = "ALTR,pio-13.1", "ALTR,pio-1.0", "altr,pio-1.0";
reg = < 0x00000001 0x000100C0 0x00000010 >;
interrupt-parent = < &hps_0_arm_gic_0 >;
interrupts = < 0 45 1 >;
width = < 2 >; /* embeddedsw.dts.params.width type NUMBER */
resetvalue = < 0 >; /* embeddedsw.dts.params.resetvalue type NUMBER */
edge_type = < 1 >; /* embeddedsw.dts.params.edge_type type NUMBER */
level_trigger = < 0 >; /* embeddedsw.dts.params.level_trigger type NUMBER */
#gpio-cells = < 2 >;
gpio-controller;
The following is the driver code.
writel(pst_pio->np_pioedgecapture|0x1, &pst_pio->np_pioedgecapture);
writel(pst_pio->np_piodirection&0xfffffffe, &pst_pio->np_piodirection);
ret = request_irq(FPGA_BUTTON_DSR_IRQ, button_dsr_isr, IRQF_DISABLED, "button_dsr_fpga", (void*)(pst_dev));
if (ret != 0)
{
printk("button_dsr: unable to register interrupt %d\n", ret);
return -1;
}
writel(pst_pio->np_piointerruptmask|1, &pst_pio->np_piointerruptmask);
comment out "interrupts = < 0 45 1 >;" after successful registration, interrupt can also be normal response. what is the reason？ If you have any ideas would be greatly appreciated.Thanks
