linux-kernel - Re: [PATCH] gpio: xgene: Fix kconfig for standby GIPO contoller

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Date:	Mon, 7 Mar 2016 11:47:01 +0100
From:	Matthias Brugger <mbrugger@...e.com>
To:	Linus Walleij <linus.walleij@...aro.org>
Cc:	Alexandre Courbot <gnurou@...il.com>,
	Quan Nguyen <qnguyen@....com>,
	"linux-gpio@...r.kernel.org" <linux-gpio@...r.kernel.org>,
	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH] gpio: xgene: Fix kconfig for standby GIPO contoller



On 07/03/16 08:41, Linus Walleij wrote:
> On Fri, Mar 4, 2016 at 6:42 PM, Matthias Brugger <mbrugger@...e.com> wrote:
>
>> The standby GPIO controller can be used as a interrupt controller.
>> Select GPIOLIB_IRQCHIP when compiling this driver. Otherwise we get
>> a compilation error:
>>
>> drivers/gpio/gpio-xgene-sb.c: In function 'xgene_gpio_sb_probe':
>> drivers/gpio/gpio-xgene-sb.c:312:10: error: 'struct gpio_chip' has no member named 'irqdomain'
>>    priv->gc.irqdomain = priv->irq_domain;
>>            ^
>> scripts/Makefile.build:295: recipe for target 'drivers/gpio/gpio-xgene-sb.o' failed
>> make[2]: *** [drivers/gpio/gpio-xgene-sb.o] Error 1
>>
>> Apart if compiled as module, we get the following modpost errors:
>> ERROR: "irq_chip_eoi_parent" [drivers/gpio/gpio-xgene-sb.ko] undefined!
>> ERROR: "irq_chip_unmask_parent" [drivers/gpio/gpio-xgene-sb.ko] undefined!
>> ERROR: "irq_chip_mask_parent" [drivers/gpio/gpio-xgene-sb.ko] undefined!
>> ERROR: "irq_domain_create_hierarchy" [drivers/gpio/gpio-xgene-sb.ko] undefined!
>> ERROR: "gpiochip_get_data" [drivers/gpio/gpio-xgene-sb.ko] undefined!
>> ERROR: "irq_chip_set_type_parent" [drivers/gpio/gpio-xgene-sb.ko] undefined!
>> ERROR: "irq_domain_alloc_irqs_parent" [drivers/gpio/gpio-xgene-sb.ko] undefined!
>> ERROR: "irq_domain_set_hwirq_and_chip" [drivers/gpio/gpio-xgene-sb.ko] undefined!
>> ERROR: "irq_domain_reset_irq_data" [drivers/gpio/gpio-xgene-sb.ko] undefined!
>>
>> This patch changes the kconfig so that the gpio controller can only be
>> build-in and selects GPIOLIB_IRQCHIP.
>>
>> Fixes: 1013fc41 "gpio: xgene: Enable X-Gene standby GPIO as interrupt controller"
>> Cc: Quan Nguyen <qnguyen@....com>
>> Signed-off-by: Matthias Brugger <mbrugger@...e.com>
>> ---
>>
>> Changes for v2:
>> - Add modprobe fix, changing tristate to bool
>> - Add Cc tag
>
> Quan has sent a patch exporting the offending functions, but no reply from
> the irqchip maintainers yet.
>
> If they don't react we'll have to merge this and handle the module loading
> later.
>

Thanks for the info.

Just as a heads up, this patch fix two problems. Apart from the missing 
exports for the irqchip functions, it selects GPIOLIB_IRQCHIP as 
otherwise the config may be broken.

Actually v1 of this patch just fixes this:
https://patchwork.kernel.org/patch/8502401/

Regards,
Matthias