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

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Message-ID: <CACRpkdYxeieES5Y5tbCRfSe=Cnj2QsoU5KvSPZ99XsJ9AUrEmw@mail.gmail.com>
Date:	Tue, 25 Mar 2014 21:43:49 +0100
From:	Linus Walleij <linus.walleij@...aro.org>
To:	Sebastian Andrzej Siewior <bigeasy@...utronix.de>
Cc:	delicious quinoa <delicious.quinoa@...il.com>,
	Alan Tull <atull@...era.com>,
	Alexandre Courbot <gnurou@...il.com>,
	"linux-gpio@...r.kernel.org" <linux-gpio@...r.kernel.org>,
	linux-kernel <linux-kernel@...r.kernel.org>,
	Dinh Nguyen <dinguyen@...era.com>
Subject: Re: [PATCH 2/3] gpio: dwapb: do not create the irq mapping upfront.

On Sat, Mar 22, 2014 at 1:37 PM, Sebastian Andrzej Siewior
<bigeasy@...utronix.de> 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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