If the 'i2c-bus' device-tree node is present for an I2C adapter then
parse this subnode for I2C slaves.
Signed-off-by: NJon Hunter <jonathanh@nvidia.com>
Acked-by: NWolfram Sang <wsa@the-dreams.de>
Signed-off-by: NThierry Reding <treding@nvidia.com>