[PATCH v3 3/4] irqchip: Add BCM2835 AUX interrupt controller

[Florian Fainelli]

On 06/14/2017 09:29 AM, Phil Elwell wrote:
> Devices in the BCM2835 AUX block share a common interrupt line, with a
> register indicating which devices have active IRQs. Expose this as a
> nested interrupt controller to avoid IRQ sharing problems (easily
> observed if UART1 and SPI1/2 are enabled simultaneously).
> 
> Signed-off-by: Phil Elwell <phil at raspberrypi.org>
> ---

> +/*
> + * The irq_mask and irq_unmask function pointers are used without
> + * validity checks, so they must not be NULL. Create a dummy function
> + * with the expected type for use as a no-op.
> + */
> +static void bcm2835_aux_irq_dummy(struct irq_data *data)
> +{
> +}
> +
> +static struct irq_chip bcm2835_aux_irq_chip = {
> +	.name = "bcm2835-aux_irq",
> +	.irq_mask = bcm2835_aux_irq_dummy,
> +	.irq_unmask = bcm2835_aux_irq_dummy,
> +};

So how are the interrupt enabled/disabled if this interrupt controller
just returns their pending state?
-- 
Florian