linux-kernel - Re: [PATCH 2/2] pinctrl: sirf: switch driver to use gpiolib irqchip helpers

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Date:	Thu, 10 Apr 2014 20:32:04 +0200
From:	Linus Walleij <linus.walleij@...aro.org>
To:	Barry Song <baohua@...nel.org>
Cc:	LKML <linux-kernel@...r.kernel.org>,
	Barry Song <Baohua.Song@....com>,
	"linux-gpio@...r.kernel.org" <linux-gpio@...r.kernel.org>,
	DL-SHA-WorkGroupLinux <workgroup.linux@....com>
Subject: Re: [PATCH 2/2] pinctrl: sirf: switch driver to use gpiolib irqchip helpers

On Thu, Apr 10, 2014 at 11:30 AM, Barry Song <baohua@...nel.org> wrote:

>> with this:
>> # cat /proc/interrupts
>>            CPU0
>>  16:        944  irq_sirfsoc   0  sirfsoc_timer0
>> ...
>> 105:          0  sirf-gpio-irq  13  extcon-gpio
>> ...
>>
>> i will do a debug to find why. any idea from you?
>
> hi linus, after reading the source codes of GPIOLIB_IRQCHIP, i think
> the new irq number after applying your patch should not be a problem.
> the reason is that you create irq mapping earlier in
> gpiochip_irqchip_add(), but the old codes did it later on demand in
> sirfsoc_gpio_to_irq().

Yeah it's just some number, it's dynamically allocated to you should
not need to worry about that. It could even change with probe order
due to unpredictable things.

> the real problem here is that we have several gpio banks, but there is
> only one device node, so i think this should be not good and will make
> the gpiochip_irq_reqres(), gpiochip_irq_relres() fail since
> sub-devices can only point its interrupt parent to the only gpio node,
> this makes hwirq bigger than the size of the gpio bank.
>
> so will you wait for me to send a patch to merge all banks into one
> gpio_chip just as i have done by commit
> https://git.kernel.org/cgit/linux/kernel/git/torvalds/linux.git/commit/?id=8daeffb058f78deb0b0ef2cb67ef741c38788bf9
> to merge irq_domain?

Sure I'm standing by.

Bonus points if you rebase my patch on top of it and send it
as patch 2/2 :-D

Yours,
Linus Walleij
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