gpio as both interrupt pin and wake-up source

[akbar123]

Hi,

I have used GPIO pin as wake-up source in my imx6 apalis board by enabling it with the following snippet in device tree:

gpio-keys {
    compatible = "gpio-keys";
    pinctrl-names = "default";
    pinctrl-0 = <&pinctrl_gpio_keys>;

    wakeup {
        label = "Wake-Up";
        gpios = <&gpio1 4 GPIO_ACTIVE_LOW>;
        linux,code = <KEY_WAKEUP>;
        debounce-interval = <10>;
        wakeup-source;
    };
};

Now I can wake up imx6 when it's in sleep by the gpio pin

I have test another scenario to generate interrupt by a gpio pin with the following snippet in the device tree:

gpio-controller;
interrupt-controller;
interrupt-parent = <&gpio1>;
interrupts = <4 IRQ_TYPE_EDGE_FALLING>;

Now, I want to combine these two scenarios. I want a gpio pin to act as both wake-up source and interrupt pin, i.e. when imx6 is in sleep, the interrupt will wake it up, and when it's wakeup, the interrupt acts as usual and be received by other parts such as a driver willing to receive it

Question: How can I do the above scenario?

Thanks in advance

[gauravsharma7]

Hi @akbar123 ,

You can configure IRQ on a GPIO and set it as a wakeup source at the same time with something like below:-
This I had configured for imx93evk but you can modify it for your platform.

/ {

        gpio-keys {

                compatible = "gpio-keys";

                pinctrl-names = "default";

                pinctrl-0 = <&pinctrl_gpio_keys>;

                power {

                  label = "GPIO Key Power";

                  linux,code = <KEY_POWER>;

                  gpios = <&gpio2 7 GPIO_ACTIVE_LOW>;

                  wakeup-source;

                  debounce-interval = <20>;

                  interrupt-parent = <&gpio2>;

                  interrupts = <7 IRQ_TYPE_LEVEL_LOW>;

                };

        };

};

&iomuxc {

        pinctrl_gpio_keys: gpio_keys_grp {

                fsl,pins = <

                        MX93_PAD_GPIO_IO07__GPIO2_IO07  0x31e

                >;

        };

};

On your imx linux console, you can verify that interrupts have been mapped via /proc/interrupts

Cheers!!

[igorpadykov]

Hi Asghar

one can try to follow gpio-keys linux documentation, wakeup-source is optional:

https://github.com/varigit/linux-imx/blob/imx_4.14.78_1.0.0_ga_var01/Documentation/devicetree/bindin...

Best regards
igor