linux-kernel - Re: [PATCH v2 5/7] pinctrl: aramda-37xx: Add irqchip support

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Message-ID: <874lya8zyd.fsf@free-electrons.com>
Date:   Thu, 30 Mar 2017 18:57:30 +0200
From:   Gregory CLEMENT <gregory.clement@...e-electrons.com>
To:     Linus Walleij <linus.walleij@...aro.org>
Cc:     "linux-gpio\@vger.kernel.org" <linux-gpio@...r.kernel.org>,
        Jason Cooper <jason@...edaemon.net>,
        Andrew Lunn <andrew@...n.ch>,
        Sebastian Hesselbarth <sebastian.hesselbarth@...il.com>,
        Thomas Petazzoni <thomas.petazzoni@...e-electrons.com>,
        "linux-arm-kernel\@lists.infradead.org" 
        <linux-arm-kernel@...ts.infradead.org>,
        Rob Herring <robh+dt@...nel.org>,
        "devicetree\@vger.kernel.org" <devicetree@...r.kernel.org>,
        "linux-kernel\@vger.kernel.org" <linux-kernel@...r.kernel.org>,
        Nadav Haklai <nadavh@...vell.com>,
        Victor Gu <xigu@...vell.com>, Marcin Wojtas <mw@...ihalf.com>,
        Wilson Ding <dingwei@...vell.com>,
        Hua Jing <jinghua@...vell.com>,
        Neta Zur Hershkovits <neta@...vell.com>
Subject: Re: [PATCH v2 5/7] pinctrl: aramda-37xx: Add irqchip support

Hi Linus,
 
 On mer., mars 29 2017, Linus Walleij <linus.walleij@...aro.org> wrote:

>>> It has irq_create_mapping(gpiochip->irqdomain, offset); that get
>>> called for every IRQ, and that will eventually call irq_of_parse_and_map()
>>> if the IRQs are defined in the device tree. (IIRC)
>>
>> When I followed the functions called I never find a call to
>> irq_of_parse_and_map(), the closer things related to device tree I found
>> was:
>> "virq = irq_domain_alloc_descs(-1, 1, hwirq, of_node_to_nid(of_node),
>> NULL);"
>> http://elixir.free-electrons.com/source/kernel/irq/irqdomain.c?v=4.11-rc4#L507
>
> I don't know if I'm rambling or what. I'm pretty sure it gets called, maybe
> even earlier, like when the DT is parsed for the platform. We have so many
> drivers not seemingly needing this, but if your driver needs it, all others
> may need to be fixed too.
>
> Can you put a print in irq_of_parse_and_map() and see what happens?

So if I don't call it explicitly in my driver, then  this function is
never called for the gpio.

Gregory

-- 
Gregory Clement, Free Electrons
Kernel, drivers, real-time and embedded Linux
development, consulting, training and support.
http://free-electrons.com