Can not use two irq for different driver

[SChen.11]

Hi, I use two touch panels, one is ft5306 and another is tsc2007. These are under same i2c bus, the i2c2 controller.The ft5306 use PG8 as interrupt line. The tsc2007 use PI8 as interrupt ine. Here is my dts code for these devices.

331         ft5x06: ft5x06@38 {
332                 compatible = "edt,edt-ft5306";
333                 reg = <0x38>;
334                 interrupts = <8 IRQ_TYPE_EDGE_FALLING>;
335                 interrupt-parent = <&gpiog>;
336                 interrupt-controller;
337                 reset-gpios = <&gpiog 7 GPIO_ACTIVE_LOW>;
338                 status = "okay";
339         };
 
362         tsc2007: tsc2007@48 {
363                 compatible = "ti,tsc2007";
364                 reg = <0x48>;
365                 interrupt-parent = <&gpioi>;
366                 interrupts = <8 IRQ_TYPE_EDGE_FALLING>;
367                 interrupt-controller;
368                 gpios = <&gpioi 8 GPIO_ACTIVE_LOW>;
369                 ti,x-plate-ohms = <660>;
370                 wakeup-source;
371         };

When the linux system startup, the tsc2007 loaded and successful. But the ft5306 driver was error.

[    6.996552] stm32mp157-pinctrl soc:pin-controller@50002000: irq line 8 already requested.
[    7.038288] edt_ft5x06 0-0038: Unable to request touchscreen IRQ.
[    7.076451] edt_ft5x06: probe of 0-0038 failed with error -16

It said the "irq line 8 already requested", but these devices use different IOs as interrupt. And I checked the /proc/interrupts file. The irq line 8 was requested by tsc2007. Now, I am confuse about the stm32gpio irq line. Because that two touchs dts code on other chip platform is works very well.

 71:          0          0  stm32-exti-h  19 Edge      5c004000.rtc:wakeup
 72:          0          0  stm32-exti-h  68 Edge      m4@0
 73:          0          0  stm32gpio   8 Edge      tsc2007

[Uwe Bonnes]

The EXTI controller on STM32 can only select one Pin per Pin number. As you need PG8 and PI8, this does not work. Interrupts on PG8 and PG8 will work as will PG8 and PI9.

[PatrickF · Accepted solution]

Notice that EXTI can allocate interrupt of only one GPIO pin of same number regardless the GPIO port (see RM abstract below).

So, you cannot define EXTI8 to be from PG8 and PI8 at same time.

You should use another EXTIn channel and another PXn pin for the 2nd interrupt line (with n != 8).