linux-kernel - Re: [PATCH 0/8] da9055: Driver initialisation fixes, add DT support

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Date:	Thu, 06 Feb 2014 05:22:41 -0800
From:	Guenter Roeck <linux@...ck-us.net>
To:	"Opensource [Adam Thomson]" <Adam.Thomson.Opensource@...semi.com>
CC:	Mark Brown <broonie@...nel.org>, Lee Jones <lee.jones@...aro.org>,
	"alsa-devel@...a-project.org" <alsa-devel@...a-project.org>,
	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
	"devicetree@...r.kernel.org" <devicetree@...r.kernel.org>,
	Rob Herring <robh+dt@...nel.org>,
	Linus Walleij <linus.walleij@...aro.org>,
	Dmitry Torokhov <dmitry.torokhov@...il.com>,
	Alessandro Zummo <a.zummo@...ertech.it>
Subject: Re: [PATCH 0/8] da9055: Driver initialisation fixes, add DT support

On 02/06/2014 03:46 AM, Opensource [Adam Thomson] wrote:
> On Thu, Feb 06, 2014 at 00:54:11AM +0000, Guenter Roeck wrote:
>
>> Adam,
>>
>> You don't really explain what the problem actually is. Can you elaborate ?
>
> Sorry, yes. For the conflicting device Ids, both the PMIC and the CODEC used
> the same I2C Id string, which meant if you tried to intiate both together on the
> same bus, then the second would fail.
>
> For the removal of platform_get_irq_byname(), the reason for this was that it
> was conflicting with regmap_irq_get_virq() when the IRQ value returned from
> platform_get_irq_byname() was being passed to regmap_irq_get_virq(). The result
> for the code was that it would try to request a threaded IRQ using an invalid
> IRQ number (have also described this further in patch 0004 mail thread,
> https://lkml.org/lkml/2014/2/6/126).
>
>>
>> Also, I have been using platform_get_irq() to get the interrupt resource
>> in mfd client drivers and similar situations. Wouldn't this work here as well
>> if you don't want to use platform_get_irq_byname() ?
>
> What I could've done is use platform_get_irq_byname() and avoided using
> regmap_irq_get_virq() as I would already have the correct VIRQ to pass to
> request_threaded_irq(), but I figured that using regmap_irq_get_virq() made
> more sense at the time, and was unable to use both.
>

I may be missing something, but I think the problem may be that you are
doing two mappings instead of just one. I don't think you need to call
regmap_irq_get_virq() at all.

Guenter

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