On 3 August 2015 at 08:19, Simon Glass <s...@chromium.org> wrote: > Add a new I2C_MUX uclass. Devices in this class can multiplex between > several I2C buses, selecting them one at a time for use by the system. > The multiplexing mechanism is left to the driver to decide - it may be > controlled by GPIOs, for example. > > The uclass supports only two methods: select() and deselect(). > > The current mux state is expected to be stored in the mux itself since > it is the only thing that knows how to make things work. The mux can > record the current state and then avoid switching unless it is necessary. > So select() can be skipped if the mux is already in the correct state. > Also deselect() can be made a nop if required. > > Signed-off-by: Simon Glass <s...@chromium.org> > --- > > Changes in v2: > - Update commit message and header file to better explain select()/deselect() > > doc/device-tree-bindings/i2c/i2c-mux.txt | 60 ++++++++++ > drivers/i2c/Kconfig | 2 + > drivers/i2c/Makefile | 2 + > drivers/i2c/muxes/Kconfig | 8 ++ > drivers/i2c/muxes/Makefile | 6 + > drivers/i2c/muxes/i2c-mux-uclass.c | 198 > +++++++++++++++++++++++++++++++ > include/dm/uclass-id.h | 1 + > include/i2c.h | 39 ++++++ > 8 files changed, 316 insertions(+) > create mode 100644 doc/device-tree-bindings/i2c/i2c-mux.txt > create mode 100644 drivers/i2c/muxes/Kconfig > create mode 100644 drivers/i2c/muxes/Makefile > create mode 100644 drivers/i2c/muxes/i2c-mux-uclass.c
Applied to u-boot-dm. _______________________________________________ U-Boot mailing list U-Boot@lists.denx.de http://lists.denx.de/mailman/listinfo/u-boot
