Vincent DEFERT <vincent.defert%posteo.net@localhost> wrote:
I want to add interrupt handling to the Meson pinctrl driver.
I have seen that this is handled by attaching gpioirq to the desired pin
with gpioctl(8) and there's an example of how to implement the
underlying capability in sunxi_gpio.c.
I also have the S905 documentation and the source code of the vendor
Linux driver as reference. So far, so good.
You could also look at rk_gpio.c and sys/dev/i2c/fusbtc.c, combined
with a dump of the dtb for the Pinebook Pro.
The only thing I don't know is how to retrieve the GPIO interrupt
controller configuration.
It is stored in a gpio_intc node with the "amlogic,meson-gpio-intc"
compatible string, but none of the 2 gpio instances reference it.
How can I search the full FDT to find this node?
I don't think you should need to search the device tree for this.
I would expect you to write a driver that matches on that compat
string, it would map the registers of the interrupt controller
and hook up this interrupt controller to the main one.