Initially the I2C Bus specification had been written by Philips Semiconductors. This company became NXP Semiconductors which now it the stakeholder of the I2C bus specification.
Version 1.01.00 r0.05 15-Dec-2009(最新2.1版本还没有搜到,官网有但是没有账户可惜了)
DRAFT MIPI Alliance Specification for Camera Serial Interface 2 (CSI-2)
我还上传了一个简单中文版(不完全准确),积分5有兴趣的可以看看