On Thu, Jun 23, 2016 at 04:59:00PM +0100, Jon Hunter wrote:

The I2C driver core for boards using device-tree assumes any subnode of
an I2C adapter in the device-tree blob as being a I2C slave device.
Although this makes complete sense, some I2C adapters may have subnodes
which are not I2C slaves but subnodes presenting other features. For
example some Tegra devices have an I2C interface which may share its
pins with other devices and to share these pins subnodes for
representing these pins so they have be shared via the pinctrl framework
are needed.

To allow I2C adapters to have non-I2C specific subnodes in device-tree
that are not parsed by the I2C driver core by adding support for a
'i2c-bus' subnode where I2C slaves can be placed. If the 'i2c-bus'
subnode is present then all I2C slaves must be placed under this subnode.

Signed-off-by: Jon Hunter <jonathanh@nvidia.com>
Acked-by: Thierry Reding <redacted>
---
 Documentation/devicetree/bindings/i2c/i2c.txt | 8 ++++++++
 1 file changed, 8 insertions(+)

Acked-by: Rob Herring <robh@kernel.org>