Linux/AM5726: GPIO interrupt configuration

yimin bai34

Genius 4755 points

Part Number: AM5726
Other Parts Discussed in Thread: TMP102

Tool/software: Linux

Hi Sir

we would like to set one GPIO as interrupt pin to get signal from external device.

Where can we find the example about AM57xx GPIO setting ( like request_irq)

thanks for reply

Yimin

over 8 years ago

0 Biser Gatchev-XID over 8 years ago

TI__Guru**** 393215 points

What software are you using?

0 Yordan Kovachev over 8 years ago

TI__Guru**** 161600 points

Hi Yimin,

You can set this in the dts file, for example see am57xx-beagle-x15-common.dtsi:
tmp102: tmp102@48 {
compatible = "ti,tmp102";
reg = <0x48>;
interrupt-parent = <&gpio7>;
interrupts = <16 IRQ_TYPE_LEVEL_LOW>;
#thermal-sensor-cells = <1>;
};

You can see that tmp102 uses gpio7_16 as interrupt.

Best Regards,
Yordan

0 yimin bai34 over 8 years ago in reply to Yordan Kovachev

Genius 4755 points

HI Sir

If we used nmin_dsp as interrupt pin , and we already set below registers
1. CTRL_CORE_PAD_NMIN_DSP -> set Wakeup is enabled and Pull Up is selected
2. CTRL_CORE_NMI_DESTINATION_2 [7:0] -> set 0x1 => NMI mapping to MPU_IRQ_133

and in below sample code
irq_id = 133;
ret = request_irq(irq_id, sdr_dev_intr, IRQF_TRIGGER_FALLING, "fpga_irq", 0);
if (ret != 0)
{
printk("interrupt init error!ret = %d\n", ret);
}
else
printk("interrupt init success!!\n");

we cannot receive the interrupt.

what is the number of irq_id ? and do you have any document for reference

BR
Yimin

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Linux/AM5726: GPIO interrupt configuration