linux-kernel - Re: [PATCH v2 3/3] gpiolib: debugfs: identify gpios requested as irq only

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Date:	Mon, 1 Jun 2015 14:52:31 +0200
From:	Linus Walleij <linus.walleij@...aro.org>
To:	Grygorii Strashko <grygorii.strashko@...aro.org>
Cc:	Alexandre Courbot <gnurou@...il.com>,
	"linux-gpio@...r.kernel.org" <linux-gpio@...r.kernel.org>,
	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
	Johan Hovold <johan@...nel.org>
Subject: Re: [PATCH v2 3/3] gpiolib: debugfs: identify gpios requested as irq only

On Wed, May 20, 2015 at 12:30 PM, Grygorii Strashko
<grygorii.strashko@...aro.org> wrote:

> Now many of GPIO drivers implement two interfaces gpiolib and irqchip
> which are essentially orthogonal. So, now GPIO line can be requested
> in three ways:
> 1) As pure GPIO (gpioX_request())
> 2) As pure GPIO IRQ, especially in DT boot case.
>   DT:
>         interrupt-parent = <&gpio6>;
>         interrupts = <11 IRQ_TYPE_EDGE_FALLING>;
>   Code:
>         platform_get_irq() or of_irq_get()
>         request_irq()
> 3) combination of (1) and (2).
>
> And from GPIO debugfs it could be identified when GPIO is
> requested/used or used as IRQ, but there is no way to determine
> when GPIO is requested/used as IRQ only.
>
> Such information is useful for debugging, so update GPIO debugfs code
> to show marker '<irq-only>' for GPIO lines which are requested/used as
> GPIO IRQ only.
>
> After this patch sys/kernel/debug/gpio will produce following output:
>   ...
>  GPIOs 160-191, platform/4805d000.gpio, gpio:
>   gpio-171 ((null)              ) in  hi IRQ-209 <irq-only>
>
>  GPIOs 192-223, platform/48051000.gpio, gpio:
>   gpio-203 (vtt_fixed           ) out hi
>
> Cc: Johan Hovold <johan@...nel.org>
> Signed-off-by: Grygorii Strashko <grygorii.strashko@...aro.org>

Patch applied.

Yours,
Linus Walleij
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