topic Re: How to configure device tree for external interrupt as input on imx8qp? in i.MX Processors

How to configure device tree for external interrupt as input on imx8qp?

Anton_K — Tue, 31 Oct 2023 09:24:03 GMT

Hello, I need to configure device tree correctly. I have I2C sensor driver which also has interrupt on output. On the source code it uses

request_threaded_irq(6) with the following inputs:

request_threaded_irq(client->irq, NULL, bh1770_irq, IRQF_TRIGGER_FALLING | IRQF_ONESHOT | IRQF_TRIGGER_LOW, "bh1770", chip);

I got access to I2C buss correctly by device tree, but can't configure external interrupt...
I've assumed the following configuration:

&i2c3 { #address-cells = <1>; #size-cells = <0>; clock-frequency = <100000>; pinctrl-names = "default"; pinctrl-0 = <&pinctrl_lpi2c3>; status = "okay"; /* Light sensor */ bh1770: bh1770@38 { compatible = "osram,bh1770"; pinctrl-names = "default"; pinctrl-0 = <&pinctrl_bh1770>; reg = <0x38>; interrupt-parent = <&lsio_gpio3>; interrupts = <24 IRQ_TYPE_EDGE_FALLING>; status = "okay"; }; }; &iomuxc { ... pinctrl_bh1770: bh1770grp { fsl,pins = < IMX8QXP_QSPI0B_SS1_B_LSIO_GPIO3_IO24 0x21 >; }; ... };

Actually I got error -22 (looks like EINVAL) just on runtime by request_threaded_irq().
Can someone help me, what do I wrong?
Thanks in advance, Anton

Re: How to configure device tree for external interrupt as input on imx8qp?

Anton_K — Tue, 31 Oct 2023 11:28:07 GMT

UPD: I've changed pin mux configuration in dtsi file according reference manual as the LSIO_GPIO3_IO24 to:

IMX8QXP_QSPI0B_SS1_B_LSIO_GPIO3_IO24 0x26000021

But it doesn't help. Also I got extra log in dmesg:

genirq: Failed to request resources for bh1770 (irq 295) on irqchip gpio-mxc

I have no idea why irq got number 295, may be there is the reason? Hot to understand where that number setup and what should be?

Re: How to configure device tree for external interrupt as input on imx8qp?

Dhruvit — Wed, 01 Nov 2023 12:36:08 GMT

Hi @Anton_K,

I hope you are doing well

Kindly share your full device tree file and the driver code to further debug the issue.

Thanks & Regards,

Dhruvit Vasavada

Re: How to configure device tree for external interrupt as input on imx8qp?

Anton_K — Wed, 01 Nov 2023 16:15:03 GMT

Hi @Dhruvit , thanks for your reply. I've just found issue. I have copied device tree and there was configured the same pin for another device. I've removed this pin configuration but left gpio_hog for this pin number. So I've applied the changes and it works fine on runtime:

&lsio_gpio3 { pinctrl-names = "default"; pinctrl-0 = <&pinctrl_mipi_csi0>; - - cam_buf_hog { - gpio-hog; - gpios = <24 0>; - output-high; - line-name = "cam_buf_en"; - }; };

Best regards, Anton.