linux-kernel - Re: [PATCH] mfd: intel_soc_pmic: use 'depends on' instead of 'select'

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Date:   Thu, 15 Jun 2017 15:07:40 +0200
From:   Hans de Goede <hdegoede@...hat.com>
To:     Lee Jones <lee.jones@...aro.org>, Arnd Bergmann <arnd@...db.de>
Cc:     Rob Herring <robh@...nel.org>,
        Andy Shevchenko <andriy.shevchenko@...ux.intel.com>,
        linux-kernel@...r.kernel.org
Subject: Re: [PATCH] mfd: intel_soc_pmic: use 'depends on' instead of 'select'

Hi,

On 15-06-17 10:09, Lee Jones wrote:
> On Fri, 09 Jun 2017, Arnd Bergmann wrote:
> 
>> 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. The same pattern
>> exists for INTEL_SOC_PMIC and INTEL_SOC_PMIC_CHTWC, so we fix both the
>> same way to keep them in sync. INTEL_SOC_PMIC does not depend on ACPI,
>> so we don't need to 'select' the I2C master driver when ACPI is disabled.
>>
>> Finally, we can limit the build to x86, unless we are compile testing.
>>
>> Fixes: 2f91ded5f8f4 ("mfd: Add Cherry Trail Whiskey Cove PMIC driver")
>> Fixes: 5f125f1f5705 ("mfd: intel_soc_pmic: Select designware i2c-bus driver")
>> Signed-off-by: Arnd Bergmann <arnd@...db.de>
>> ---
>>   drivers/mfd/Kconfig | 15 ++++++---------
>>   1 file changed, 6 insertions(+), 9 deletions(-)
> 
> I need 2 patches, one for each of the Fixes above.  The plan being to
> squash them into the original commits (keeping sign-off credits of
> course) to prevent bisectability breakage.
> 
> If that does not happen, I will have to remove both offending patches
> until they are fixed.

Ok, I've just send out a split version if this patch.

Regards,

Hans



>> diff --git a/drivers/mfd/Kconfig b/drivers/mfd/Kconfig
>> index ea5daa935518..74fa52582f06 100644
>> --- a/drivers/mfd/Kconfig
>> +++ b/drivers/mfd/Kconfig
>> @@ -454,14 +454,12 @@ config LPC_SCH
>>   
>>   config INTEL_SOC_PMIC
>>   	bool "Support for Crystal Cove PMIC"
>> -	depends on HAS_IOMEM
>> -	select GPIOLIB
>> -	select I2C
>> +	depends on HAS_IOMEM && I2C=y && GPIOLIB && COMMON_CLK
>> +	depends on X86 || COMPILE_TEST
>>   	select MFD_CORE
>>   	select REGMAP_I2C
>>   	select REGMAP_IRQ
>> -	select COMMON_CLK
>> -	select I2C_DESIGNWARE_PLATFORM
>> +	select I2C_DESIGNWARE_PLATFORM if ACPI
>>   	help
>>   	  Select this option to enable support for Crystal Cove PMIC
>>   	  on some Intel SoC systems. The PMIC provides ADC, GPIO,
>> @@ -484,13 +482,12 @@ 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
>