linux-kernel - Re: [PATCH 1/1] gpio: Provide the STMPE GPIO driver with its own IRQ Domain

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Date:	Sat, 1 Dec 2012 17:25:10 +0100
From:	Linus Walleij <linus.walleij@...aro.org>
To:	Lee Jones <lee.jones@...aro.org>
Cc:	linux-arm-kernel@...ts.infradead.org, linux-kernel@...r.kernel.org,
	arnd@...db.de, linus.walleij@...ricsson.com,
	viresh.kumar@...aro.org, Grant Likely <grant.likely@...retlab.ca>
Subject: Re: [PATCH 1/1] gpio: Provide the STMPE GPIO driver with its own IRQ Domain

On Fri, Nov 23, 2012 at 4:19 PM, Lee Jones <lee.jones@...aro.org> wrote:

> The STMPE GPIO driver can be used as an IRQ controller by some
> related devices. Here we provide it with its very own IRQ Domain
> so that IRQs can be issued dynamically. This will stand the
> driver in good stead when it is enabled for Device Tree, as this
> it a prerequisite.
>
> Cc: Grant Likely <grant.likely@...retlab.ca>
> Reviewed-by: Viresh Kumar <viresh.kumar@...aro.org>
> Signed-off-by: Lee Jones <lee.jones@...aro.org>

The patch looks bogus since there is no code exercising the added
irqdomain code in this patch, it's basically a no-op in the irq
path, which is wrong for an irqdomain.

It is lacking a irq_create_mapping() in stmpe_gpio_to_irq(),
removal of the irq_base member and usage of
irq_find_mapping() in stmpe_gpio_irq().

Only then will the irqdomain actually be used for what it's
intended for.

So I get the impression that this is one of these "let's
just throw a dummy irqdomain in there so we can use
it with devicetree" kind of things...

Yours,
Linus Walleij
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