LTC430X(4) | Device Drivers Manual | LTC430X(4) |
ltc430x
— driver
for LTC4305 and LTC4306 I2C mux chips
To compile this driver into the kernel, place the following line in your kernel configuration file:
device ltc430x
Alternatively, to load the driver as a module at boot time, place the following line in loader.conf(5):
ltc430x_load="YES"
The ltc430x
driver supports the LTC4305
and LTC4306 I2C bus multiplexer (mux) chips. It automatically connects an
upstream I2C bus to one of several downstream buses as needed when slave
devices on the downstream buses initiate I/O. More information on the
automatic switching behavior is available in
iicmux(4).
On an fdt(4) based system, an
ltc430x
device node is defined as a child node of
its upstream i2c bus. The children of the ltc430x
node are additional i2c buses, which will have their own i2c slave devices
described in their child nodes.
The ltc430x
driver conforms to the
standard i2c/i2c-mux-ltc4306.txt
bindings document,
except that the following optional properties are not currently supported
and will be ignored if present:
On a device.hints(5) based system, these values
are configurable for ltc430x
:
ltc430x
instance is attached to.When configured via hints, the driver automatically adds an iicbus instance for every downstream bus supported by the chip. There is currently no way to indicate used versus unused channels.
The ltc430x
driver first appeared in
FreeBSD 13.0.
January 1, 2020 | Debian |