GPIO IRQ for Meson gxbb

GPIO IRQ for Meson gxbb

[Gaurav Pathak]

Hello,

I am currently trying to use GPIO IRQ on Odroid-C2 board.
I have compiled a working image having Linux Kernel 5.0.6. It has
Pin-control driver and Interrupt Controller driver enabled.
However, I am not getting any idea as to how should I request IRQ for
a particular GPIO pin say for e.g. GPIOX.10. The "gpio_to_irq()" call
is not working and it is returning "-6".
I just want to write a simple out of tree character driver.
I tried to get an idea from "drivers/gpio/", but they all seems to be
platform driver.
I would be really helpful if anyone can point me to a working gpio IRQ
example for Linux 5.0.6 kernel.



Thanks,
Gaurav Pathak

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Re: GPIO IRQ for Meson gxbb

[Martin Blumenstingl]

Hello Gaurav,

(+Cc Jerome, because I believe he was the last person working on this)

On Mon, Jun 3, 2019 at 7:51 AM Gaurav Pathak <gauravpathak129@gmail.com> wrote:
>
> Hello,
>
> I am currently trying to use GPIO IRQ on Odroid-C2 board.
> I have compiled a working image having Linux Kernel 5.0.6. It has
> Pin-control driver and Interrupt Controller driver enabled.
> However, I am not getting any idea as to how should I request IRQ for
> a particular GPIO pin say for e.g. GPIOX.10. The "gpio_to_irq()" call
> is not working and it is returning "-6".
GPIO to IRQ is currently not enabled on the Amlogic pin / GPIO
controller. in .dts you need to pass the GPIO interrupt controller as
parent and "know" the interrupt number for the GPIO. an example from
meson-gxbb-odroidc2.dts:
  interrupt-parent = <&gpio_intc>;
  /* MAC_INTR on GPIOZ_15 */
  interrupts = <29 IRQ_TYPE_LEVEL_LOW>;

I am not sure what's left to implement gpio_to_irq though


Martin

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GPIO IRQ for Meson gxbb

[Gaurav Pathak]

Hello,

I am currently trying to use GPIO IRQ on Odroid-C2 board.
I have compiled a working image having Linux Kernel 5.0.6. It has
Pin-control driver and Interrupt Controller driver enabled.
However, I am not getting any idea as to how should I request IRQ for
a particular GPIO pin say for e.g. GPIOX.10. The "gpio_to_irq()" call
is not working and it is returning "-6".
I don't want to write a platform driver, I just want to write a simple
out of tree character driver.
I tried to get an idea from "drivers/gpio/", but they all seems to be
platform driver.
I would be really helpful if anyone can point me to a working gpio IRQ
example for Linux 5.0.6 kernel.



Thanks,
Gaurav Pathak

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