Re: [PATCH 2/3] gpio: dwapb: do not create the irq mapping upfront.

[Linus Walleij <linus.walleij@xxxxxxxxxx>]

On Sat, Mar 22, 2014 at 1:37 PM, Sebastian Andrzej Siewior
<bigeasy@xxxxxxxxxxxxx> wrote:

> Linus, I don't understand why you need the mapping upfront.

This is because irqchips and gpiochips need to be orthogonal
APIs.

> I looked at
> those two links and you quote gpio_to_irq() which is not required.

In a *lot* of drivers it is implicitly required that gpio_to_irq()
is called first because they only call irq_create_mapping()
there. (And not in subsequent interrupt handlers etc.)

No matter what, I would worry less about that and spend
some time on using my new gpiolib helpers for
gpiochip_irqchip_add() and
gpiochip_set_chained_irqchip().

Yours,
Linus Walleij
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