linux-kernel - Re: [PATCH v2 2/2] mfd: intel_soc_pmic_chtwc: use 'depends on' instead of 'select'

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Date:   Thu, 15 Jun 2017 14:48:07 +0100
From:   Lee Jones <lee.jones@...aro.org>
To:     Hans de Goede <hdegoede@...hat.com>
Cc:     linux-kernel@...r.kernel.org, Arnd Bergmann <arnd@...db.de>
Subject: Re: [PATCH v2 2/2] mfd: intel_soc_pmic_chtwc: use 'depends on'
 instead of 'select'

On Thu, 15 Jun 2017, Hans de Goede wrote:

> From: Arnd Bergmann <arnd@...db.de>
> 
> I ran into a build error on ARM with a platform that has a non-standard
> clk implementation:
> 
> drivers/clk/clk.o: In function `clk_disable':
> clk.c:(.text.clk_disable+0x0): multiple definition of `clk_disable'
> arch/arm/mach-omap1/clock.o:clock.c:(.text.clk_disable+0x0): first defined here
> drivers/clk/clk.o: In function `clk_enable':
> clk.c:(.text.clk_enable+0x0): multiple definition of `clk_enable'
> arch/arm/mach-omap1/clock.o:clock.c:(.text.clk_enable+0x0): first defined here
> 
> The problem is a device driver that uses 'select COMMON_CLK', which is
> generally a bad idea: selecting a subsystem should only be done from
> a platform, otherwise we run into circular dependencies. The same driver
> also selects 'GPIOLIB' and 'I2C', which has a similar effect.
> 
> This turns all three into 'depends on', as it should be.
> 
> Finally, we can limit the build to x86, unless we are compile testing.
> 
> Fixes: 2f91ded5f8f4 ("mfd: Add Cherry Trail Whiskey Cove PMIC driver")
> Signed-off-by: Arnd Bergmann <arnd@...db.de>
> Signed-off-by: Hans de Goede <hdegoede@...hat.com>
> ---
> Changes in v2:
> -Split into 2 seperate patches for config INTEL_SOC_PMIC and
>  config INTEL_SOC_PMIC_CHTWC
> ---
>  drivers/mfd/Kconfig | 7 +++----
>  1 file changed, 3 insertions(+), 4 deletions(-)

Applied, thanks.

> diff --git a/drivers/mfd/Kconfig b/drivers/mfd/Kconfig
> index 2499f8b5135a..1428814c33f9 100644
> --- a/drivers/mfd/Kconfig
> +++ b/drivers/mfd/Kconfig
> @@ -481,13 +481,12 @@ config INTEL_SOC_PMIC_BXTWC
>  	  on these systems.
>  
>  config INTEL_SOC_PMIC_CHTWC
> -	bool "Support for Intel Cherry Trail Whiskey Cove PMIC"
> -	depends on ACPI && HAS_IOMEM
> +	tristate "Support for Intel Cherry Trail Whiskey Cove PMIC"
> +	depends on ACPI && HAS_IOMEM && I2C=y && COMMON_CLK
> +	depends on X86 || COMPILE_TEST
>  	select MFD_CORE
> -	select I2C
>  	select REGMAP_I2C
>  	select REGMAP_IRQ
> -	select COMMON_CLK
>  	select I2C_DESIGNWARE_PLATFORM
>  	help
>  	  Select this option to enable support for the Intel Cherry Trail

-- 
Lee Jones
Linaro STMicroelectronics Landing Team Lead
Linaro.org │ Open source software for ARM SoCs
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