The question is why can't be accessed regularly from user space by reading 
/dev/i2c-0 bus?
The I2C buses and devices can't be owned exclusively even by kernel due to 
I2C architecture, so as far as the bus is free, anyone should read/write to 
any address.

I have worked on many industrial boards considerably bigger than BBB 
(WindRiver kernel) and all devices with I2C for maintenance (RapidIO, DSP, 
MAC/PHY, etc) are accessible. 

Why on BeagleBone the addresses of HDMI framer, PMIC and onboard EE are 
intentionally blocked by driver ?
Or why the DRM driver is written that way?

Regards,

 

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