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This patch adds the basic infrastructure and a few stub drivers for devices that are connected via I2C busses. The infrastructure will be used to replace and extend the support that is scattered throughout viafb. The stub drivers are not very useful yet but they show how the infrastructure works, provide information about the chips integrated into a system and maybe gather some testers as it would be very difficult for a single person to get a sane test environment. The only thing this actually does is probing the I2C busses which will hopefully not cause any regressions. Signed-off-by: NFlorian Tobias Schandinat <FlorianSchandinat@gmx.de>
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