linux-kernel - Re: [PATCH] ACPI / PMIC: xpower: fix IOSF

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Date:   Fri, 2 Nov 2018 23:07:34 +0100
From:   Arnd Bergmann <arnd@...db.de>
To:     Andy Shevchenko <andriy.shevchenko@...ux.intel.com>
Cc:     "Rafael J. Wysocki" <rjw@...ysocki.net>,
        Len Brown <lenb@...nel.org>,
        Hans de Goede <hdegoede@...hat.com>,
        linux-acpi@...r.kernel.org, linux-kernel@...r.kernel.org
Subject: Re: [PATCH] ACPI / PMIC: xpower: fix IOSF_MBI dependency

On 11/2/18, Andy Shevchenko <andriy.shevchenko@...ux.intel.com> wrote:
> On Fri, Nov 02, 2018 at 12:06:43PM +0100, Arnd Bergmann wrote:
>> We still get a link failure with IOSF_MBI=m when the xpower driver
>> is built-in:
>>
>> drivers/acpi/pmic/intel_pmic_xpower.o: In function
>> `intel_xpower_pmic_update_power':
>> intel_pmic_xpower.c:(.text+0x4f2): undefined reference to
>> `iosf_mbi_block_punit_i2c_access'
>> intel_pmic_xpower.c:(.text+0x5e2): undefined reference to
>> `iosf_mbi_unblock_punit_i2c_access'
>>
>> This makes the dependency stronger, so we can only build when IOSF_MBI
>> is built-in.
>>
>> Fixes: 6a9b593d4b6f ("ACPI / PMIC: xpower: Add depends on IOSF_MBI to
>> Kconfig entry")
>> Signed-off-by: Arnd Bergmann <arnd@...db.de>
>> ---
>>  drivers/acpi/Kconfig | 2 +-
>>  1 file changed, 1 insertion(+), 1 deletion(-)
>>
>> diff --git a/drivers/acpi/Kconfig b/drivers/acpi/Kconfig
>> index 18851e7eedd5..31a3c4a03f61 100644
>> --- a/drivers/acpi/Kconfig
>> +++ b/drivers/acpi/Kconfig
>> @@ -514,7 +514,7 @@ config CRC_PMIC_OPREGION
>>
>>  config XPOWER_PMIC_OPREGION
>>  	bool "ACPI operation region support for XPower AXP288 PMIC"
>> -	depends on MFD_AXP20X_I2C && IOSF_MBI
>> +	depends on MFD_AXP20X_I2C && IOSF_MBI=y
>
> To me sounds like
>
> select IOSF_MBI would be more appropriate here.

It looks like we have a mix of the two two, with most drivers
using 'select' and only a few ones using 'depends on'. Mixing
the two often leads to trouble, especially for user-visible
symbols.

Making it a hidden symbol that is always selected is probably
fine, but then every driver selecting it must also use 'depends
on X86 && PCI'.

      Arnd