radeon_setup_i2c_bus
radeon_setup_i2c_bus(&rinfo->i2c[0], "monid");
radeon_setup_i2c_bus(&rinfo->i2c[1], "dvi");
radeon_setup_i2c_bus(&rinfo->i2c[2], "vga");
radeon_setup_i2c_bus(&rinfo->i2c[3], "crt2");