Re: [PATCH] i2c: Drop I2C_CLASS_ALL

[Jean Delvare <khali-PUYAD+kWke1g9hUCZPvPmw@public.gmane.org>]

Hi Sonic,

On Fri, 31 Oct 2008 10:51:19 +0800, Zhang, Sonic wrote:
> If only I2C_CLASS_HWMON and  I2C_CLASS_SPD must be probed, why other
> classes are still list in the head files?

We are in a transition phase. We must wait for all users of a class
flag to go away before we can drop the corresponding flag. You are
right though that some flags could be removed already. For example, as
far as I can see there are no users of I2C_CLASS_CAM_ANALOG nor
I2C_CLASS_SOUND left, so we could drop these 2 flags now. Additionally,
class I2C_CLASS_CAM_DIGITAL is set by a number of bus drivers but no
chip driver checks for that flag, so it's probably safe to drop it as
well.

For I2C_CLASS_TV_ANALOG and I2C_CLASS_TV_DIGITAL, it will take some
more time, as there are a number of old drivers which do actually rely
on probing and which may be a little hard to convert. But anyway their
usage should be limited to a few drivers/media/video drivers.

In the long run, Only I2C_CLASS_HWMON, I2C_CLASS_DDC and I2C_CLASS_SPD
should be widely used.

-- 
Jean Delvare