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dt-bindings: i2c: mux: ltc4306: Add dt-bindings for I2C multiplexer/switch

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This patch adds support for the Analog Devices / Linear Technology
LTC4306 and LTC4305 4/2 Channel I2C Bus Multiplexer/Switches.
The LTC4306 optionally provides two general purpose input/output pins
(GPIOs) that can be configured as logic inputs, opendrain outputs or
push-pull outputs via the generic GPIOLIB framework.

Signed-off-by: Michael Hennerich <michael.hennerich@analog.com>
Acked-by: Rob Herring <robh@kernel.org>
Signed-off-by: Peter Rosin <peda@axentia.se>
This commit is contained in:
Michael Hennerich 2017-04-11 14:16:15 +02:00 • committed by Peter Rosin
parent f089236114
commit 84ffac8971
1 changed files with 61 additions and 0 deletions

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Documentation/devicetree/bindings/i2c/i2c-mux-ltc4306.txt Normal file
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* Linear Technology / Analog Devices I2C bus switch
Required Properties:
- compatible: Must contain one of the following.
"lltc,ltc4305", "lltc,ltc4306"
- reg: The I2C address of the device.
The following required properties are defined externally:
- Standard I2C mux properties. See i2c-mux.txt in this directory.
- I2C child bus nodes. See i2c-mux.txt in this directory.
Optional Properties:
- enable-gpios: Reference to the GPIO connected to the enable input.
- i2c-mux-idle-disconnect: Boolean; if defined, forces mux to disconnect all
children in idle state. This is necessary for example, if there are several
multiplexers on the bus and the devices behind them use same I2C addresses.
- gpio-controller: Marks the device node as a GPIO Controller.
- #gpio-cells: Should be two. The first cell is the pin number and
the second cell is used to specify flags.
See ../gpio/gpio.txt for more information.
- ltc,downstream-accelerators-enable: Enables the rise time accelerators
on the downstream port.
- ltc,upstream-accelerators-enable: Enables the rise time accelerators
on the upstream port.
Example:
ltc4306: i2c-mux@4a {
compatible = "lltc,ltc4306";
#address-cells = <1>;
#size-cells = <0>;
reg = <0x4a>;
gpio-controller;
#gpio-cells = <2>;
i2c@0 {
#address-cells = <1>;
#size-cells = <0>;
reg = <0>;
eeprom@50 {
compatible = "at,24c02";
reg = <0x50>;
};
};
i2c@1 {
#address-cells = <1>;
#size-cells = <0>;
reg = <1>;
eeprom@50 {
compatible = "at,24c02";
reg = <0x50>;
};
};
};