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

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Date:	Mon, 7 Mar 2016 14:41:23 +0700
From:	Linus Walleij <linus.walleij@...aro.org>
To:	Matthias Brugger <mbrugger@...e.com>
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 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.

Yours,
Linus Walleij