> +  interrupt-map:
> +    description:
> +      Specifies the mapping from external GPIO interrupt lines to the output
> +      interrupts. The array items have to be ordered with the first item
> +      related to the output line 0 (IRQ 103), the next one to the output line 1
> +      (IRQ 104) and so on up to the output line 8 (IRQ 110).

maxItems 8?

> +        /*
> +         * The child interrupt number is computed using the following formula:
> +         *    gpio_bank * 32 + gpio_number
> +         *
> +         * with:
> +         *    - gpio_bank: The GPIO bank number
> +         *          - 0 for GPIO0A,
> +         *          - 1 for GPIO1A,
> +         *          - 2 for GPIO2A
> +         *    - gpio_number: Number of the gpio in the bank (0..31)
> +         */

I wonder if this comment wouldn't be better in the interrupt-map
description above?