On Sun, Jan 31, 2016 at 04:33:00PM +0100, Jean-Michel Hautbois wrote: > Some I2C devices have multiple addresses assigned, for example each address > corresponding to a different internal register map page of the device. > So far drivers which need support for this have handled this with a driver > specific and non-generic implementation, e.g. passing the additional address > via platform data. > > This patch provides a new helper function called i2c_new_secondary_device() > which is intended to provide a generic way to get the secondary address > as well as instantiate a struct i2c_client for the secondary address. > > The function expects a pointer to the primary i2c_client, a name > for the secondary address and an optional default address. The name is used > as a handle to specify which secondary address to get. > > The default address is used as a fallback in case no secondary address > was explicitly specified. In case no secondary address and no default > address were specified the function returns NULL. > > For now the function only supports look-up of the secondary address > from devicetree, but it can be extended in the future > to for example support board files and/or ACPI. > > Signed-off-by: Jean-Michel Hautbois <jean-michel.hautb...@veo-labs.com> > --- > v2: adding some DT bindings documentation (more than one year later...) > > Documentation/devicetree/bindings/i2c/i2c.txt | 7 +++++
Acked-by: Rob Herring <r...@kernel.org> > drivers/i2c/i2c-core.c | 42 > +++++++++++++++++++++++++++ > include/linux/i2c.h | 5 ++++ > 3 files changed, 54 insertions(+)
