linux-kernel - Re: gpio: gpio-exynos4 build fails in mainline

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Message-ID: <4DE305FD.4040503@samsung.com>
Date:	Sun, 29 May 2011 19:50:37 -0700
From:	Kukjin Kim <kgene.kim@...sung.com>
To:	Kyungmin Park <kmpark@...radead.org>
CC:	Randy Dunlap <rdunlap@...otime.net>,
	lkml <linux-kernel@...r.kernel.org>,
	Grant Likely <grant.likely@...retlab.ca>
Subject: Re: gpio: gpio-exynos4 build fails in mainline

On 05/29/11 18:24, Kyungmin Park wrote:
> On Mon, May 30, 2011 at 12:44 AM, Randy Dunlap<rdunlap@...otime.net>  wrote:
>> On Sun, 29 May 2011 08:40:00 -0700 Randy Dunlap wrote:

(snip)

>>
>> drivers/gpio/gpio-s5pv210.c:17:11: error: unable to open 'plat/gpio-core.h'
>
Hi all,

Grrr, :(

> Hi,
>
> Right, now it's just moved from mach directories to drivers/gpio
> So it requires the proper depends on each ARCH_CPU.
>
Please add me in Cc on this.

> ---
> diff --git a/drivers/gpio/Kconfig b/drivers/gpio/Kconfig
> index 5923976..655babf 100644
> --- a/drivers/gpio/Kconfig
> +++ b/drivers/gpio/Kconfig
> @@ -88,24 +88,28 @@ config GPIO_IT8761E
>
>   config GPIO_EXYNOS4
>          bool "Samsung Exynos4 GPIO library support"
> +       depends on CPU_EXYNOS4210
>          default y if CPU_EXYNOS4210
>          help
>            Say yes here to support Samsung Exynos4 series SoCs GPIO library

Basically, GPIO_EXYNOS4 is used only for EXYNOS4(EXYNOS4210) and was 
selected as a default on EXYNOS4 before moving into drivers/. I mean, do 
we really need to select this manually in kernel configuration(like make 
menuconfig)?

And I think, it's more reasonable that depends on ARCH_XXX not CPU_XXX.

Grant, how about following?

+config GPIO_EXYNOS4
+ 	bool
+	depends on ARCH_EXYNOS4
+	default y if CPU_EXYNOS4210

>
>   config GPIO_PLAT_SAMSUNG
>          bool "Samsung SoCs GPIO library support"
> +       depends on SAMSUNG_GPIOLIB_4BIT
>          default y if SAMSUNG_GPIOLIB_4BIT
>          help
>            Say yes here to support Samsung SoCs GPIO library
>
Same as above.

+config GPIO_PLAT_SAMSUNG
+	bool
+	depends on PLAT_SAMSUNG
+	default y if SAMSUNG_GPIOLIB_4BIT

>   config GPIO_S5PC100
>          bool "Samsung S5PC100 GPIO library support"
> +       depends on CPU_S5PC100
>          default y if CPU_S5PC100
>          help
>            Say yes here to support Samsung S5PC100 SoCs GPIO library
>
Same...

+config GPIO_S5PC100
+	bool
+	depends on ARCH_S5PC100
+	default y if CPU_S5PC100

>   config GPIO_S5PV210
>          bool "Samsung S5PV210/S5PC110 GPIO library support"
> +       depends on CPU_S5PV210
>          default y if CPU_S5PV210
>          help
>            Say yes here to support Samsung S5PV210/S5PC110 SoCs GPIO library
>
Same.

+config GPIO_S5PV210
+	bool
+	depends on ARCH_S5PV210
+	default y if CPU_S5PV210

One more, IMHO, would be better if they could not split like following.
As you know, 'PLAT_SAMSUNG' includes common GPIOlib for other Samsung SoCs.

config GPIO_PLAT_SAMSUNG
...
config GPIO_S5PC100
...
config GPIO_S5PV210
...
config GPIO_EXYNOS4
...


Thanks.

Best regards,
Kgene.
--
Kukjin Kim <kgene.kim@...sung.com>, Senior Engineer,
SW Solution Development Team, Samsung Electronics Co., Ltd.
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