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diff --git a/Documentation/i2c/muxes/i2c-mux-gpio b/Documentation/i2c/muxes/i2c-mux-gpio
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-Kernel driver i2c-gpio-mux
-
-Author: Peter Korsgaard <peter.korsgaard@barco.com>
-
-Description
------------
-
-i2c-gpio-mux is an i2c mux driver providing access to I2C bus segments
-from a master I2C bus and a hardware MUX controlled through GPIO pins.
-
-E.G.:
-
- ---------- ---------- Bus segment 1 - - - - -
- | | SCL/SDA | |-------------- | |
- | |------------| |
- | | | | Bus segment 2 | |
- | Linux | GPIO 1..N | MUX |--------------- Devices
- | |------------| | | |
- | | | | Bus segment M
- | | | |---------------| |
- ---------- ---------- - - - - -
-
-SCL/SDA of the master I2C bus is multiplexed to bus segment 1..M
-according to the settings of the GPIO pins 1..N.
-
-Usage
------
-
-i2c-gpio-mux uses the platform bus, so you need to provide a struct
-platform_device with the platform_data pointing to a struct
-gpio_i2cmux_platform_data with the I2C adapter number of the master
-bus, the number of bus segments to create and the GPIO pins used
-to control it. See include/linux/i2c-gpio-mux.h for details.
-
-E.G. something like this for a MUX providing 4 bus segments
-controlled through 3 GPIO pins:
-
-#include <linux/i2c-gpio-mux.h>
-#include <linux/platform_device.h>
-
-static const unsigned myboard_gpiomux_gpios[] = {
- AT91_PIN_PC26, AT91_PIN_PC25, AT91_PIN_PC24
-};
-
-static const unsigned myboard_gpiomux_values[] = {
- 0, 1, 2, 3
-};
-
-static struct gpio_i2cmux_platform_data myboard_i2cmux_data = {
- .parent = 1,
- .base_nr = 2, /* optional */
- .values = myboard_gpiomux_values,
- .n_values = ARRAY_SIZE(myboard_gpiomux_values),
- .gpios = myboard_gpiomux_gpios,
- .n_gpios = ARRAY_SIZE(myboard_gpiomux_gpios),
- .idle = 4, /* optional */
-};
-
-static struct platform_device myboard_i2cmux = {
- .name = "i2c-gpio-mux",
- .id = 0,
- .dev = {
- .platform_data = &myboard_i2cmux_data,
- },
-};