linux-kernel - Re: [PATCH v1] of/irq: do irq resolution in platform_get_irq

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Message-ID: <7h7g4zz7s4.fsf@paris.lan>
Date:	Mon, 02 Jun 2014 07:48:59 -0700
From:	Kevin Hilman <khilman@...aro.org>
To:	Grygorii Strashko <grygorii.strashko@...com>
Cc:	Grant Likely <grant.likely@...aro.org>,
	Chen-Yu Tsai <wens@...e.org>,
	Linus Walleij <linus.walleij@...aro.org>,
	Lee Jones <lee.jones@...aro.org>,
	Rob Herring <robh@...nel.org>,
	Russell King <linux@....linux.org.uk>,
	"devicetree\@vger.kernel.org" <devicetree@...r.kernel.org>,
	Tony Lindgren <tony@...mide.com>,
	Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
	LKML <linux-kernel@...r.kernel.org>,
	Rob Herring <robh+dt@...nel.org>,
	Olof Johansson <olof@...om.net>,
	Thierry Reding <thierry.reding@...il.com>,
	Santosh Shilimkar <santosh.shilimkar@...com>,
	linux-arm-kernel <linux-arm-kernel@...ts.infradead.org>
Subject: Re: [PATCH v1] of/irq: do irq resolution in platform_get_irq_byname()

Grygorii Strashko <grygorii.strashko@...com> writes:

> Hi All,
>
> On 05/28/2014 12:03 PM, Grant Likely wrote:

[...]

>> The bisected patch causes platform_get_irq() to always parse the
>> devicetree to obtain the irq instead of using a precalculated value in
>> the platform_device. There are two possible scenarios for this problem
>> that I can think of:
>> 1) Platform_get_irq() is getting called multiple times (which would
>> happen on a deferred probe) but the setup code isn't handling it
>> properly, like trying to request the GPIO more than once
>> 2) the platform_device was preloaded with an irq number that differs
>> from what is determined when parsing the tree. This would happen if a
>> platform_device was created manually.
>>
>
> Could anyone try attached patch? It has to improve situation, but it
> might not fix all problems (see my previous e-mail).

I can confirm it makes the STE Snowball boot again on top of next-20150602.

> From 4a41912dba648c935982274966426fa430fd5aa4 Mon Sep 17 00:00:00 2001
> From: Grygorii Strashko <grygorii.strashko@...com>
> Date: Wed, 28 May 2014 12:53:34 +0300
> Subject: [PATCH] mfd: ab8500: fix dt irq mapping
>
> The AD8500 defines itself as interrupt-controller in DT,
> but it doesn't assign DT node to IRQ domain when creates it.
> As result, of_irq_xx() helpers don't work because they can't
> find necessary IRQ domain.
>
> Hence, fix it by assigning AD8500 core device DT node to IRQ
> domain when it's created.
>
> Signed-off-by: Grygorii Strashko <grygorii.strashko@...com>

Tested-by: Kevin Hilman <khilman@...aro.org>

Kevin
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