linux-kernel - Re: [PATCH] I2C: Make I2C core able to be module when I2C

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Date:	Wed, 13 Aug 2014 10:50:32 +0800
From:	Lan Tianyu <tianyu.lan@...el.com>
To:	Wolfram Sang <wsa@...-dreams.de>,
	Mika Westerberg <mika.westerberg@...ux.intel.com>
CC:	torvalds@...ux-foundation.org, linux-i2c@...r.kernel.org,
	linux-kernel@...r.kernel.org
Subject: Re: [PATCH] I2C: Make I2C core able to be module when I2C_ACPI is
 selected.

On 2014年08月13日 10:03, Wolfram Sang wrote:
> On Tue, Aug 12, 2014 at 12:53:21PM +0300, Mika Westerberg wrote:
>> On Mon, Aug 11, 2014 at 03:00:55PM +0800, Lan Tianyu wrote:
>>> Commit da3c6647(I2C/ACPI: Clean up I2C ACPI code and Add CONFIG_I2C_ACPI
>>> config) adds a new kernel config I2C_ACPI and make I2C core built in
>>> when the config is selected. This is wrong because distributions
>>> etc generally compile I2C as a module and the commit broken that.
>>> This patch is to make I2C core able to be a module when I2C_ACPI is
>>> selected. Original issue the commit da3c6647 tried to avoid will
>>> be fixed in ACPICA and it's rarely triggered during unloading module. 
>>>
>>> Signed-off-by: Lan Tianyu <tianyu.lan@...el.com>
>>
>> I wonder if we can do
>>
>> 	depends on I2C=y
>>
>> here? If I understand it right, then we only build the ACPI_I2C if I2C
>> is compiled into the kernel. That way the problem da3c6647 tried to
>> solve doens't re-appear.
>>
>> We can later on relax this once ACPICA has been fixed. Thoughts?
> 
> I had the same idea yet my travel to Chicago interrupted thinking about
> it further. Once I get rid of my jetlag, I'll have a closer look. Unless
> you already came up with the perfect solution until then, of course ;)
>

Hi Mika & Wolfram:
	I have one concern about "depends on I2C=y". If distribution config
file selects I2C core as a module, the original code can enumerate I2C
slave devices from ACPI table. But now I2C_ACPI depends on I2C core
built in, the I2C module can't enumerate devices from ACPI table. This
maybe a regression for distribution?

-- 
Best regards
Tianyu Lan
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