The existing i2c sda/slc pinctrl nodes serve as an input and output
for the USIC. This limits the number of pins that can be used for i2c
since the pin must be internally connected to both DOUT0 and DX0 signals
on the USIC (for the sda signal for example).
It is also possible to use separate pins to DOUT0 and DX0, but connect
the pins externally. Add these extra pinctrl nodes and document their
use in infineon,xmc4xxx-i2c.yaml.
Signed-off-by: Andriy Gelman <andriy.gelman@gmail.com>
In commit 541482ff20 the pinctrl alternate
function mask was increased to also include open-drain setting.
Revert this change because open-drain can already be set via property
drive-open-drain.
The commit also added separate pinctrl nodes for the i2c controller and
target modes. However, the alternate function settings
is the same in both modes, so keep only one and remove the mode
label.
Signed-off-by: Andriy Gelman <andriy.gelman@gmail.com>
To be consistent with other xmc4xxx drivers.
A few other device tree changes:
- Rename clock signal option as it's handled by DX1.
- Remove clock-frequency option as it's already added in
i2c-controller.yaml, and interrupts is already defined as array
in base.yaml.
Signed-off-by: Andriy Gelman <andriy.gelman@gmail.com>
Andriy Gelman