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author | H. Peter Anvin <hpa@zytor.com> | 2012-05-30 12:11:26 -0700 |
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committer | H. Peter Anvin <hpa@zytor.com> | 2012-05-30 12:11:32 -0700 |
commit | bbd771474ec44b516107685d77e1c80bbe09f141 (patch) | |
tree | 0cb15781539a68f27b4ea6c89f827282630cbce6 /Documentation/i2c/muxes/i2c-mux-gpio | |
parent | 403e1c5b7495d7b80fae9fc4d0a7a6f5abdc3307 (diff) | |
parent | 319b6ffc6df892e4ccffff823cc5521a4a5d2dca (diff) |
Merge branch 'x86/trampoline' into x86/urgent
x86/trampoline contains an urgent commit which is necessarily on a
newer baseline.
Signed-off-by: H. Peter Anvin <hpa@zytor.com>
Diffstat (limited to 'Documentation/i2c/muxes/i2c-mux-gpio')
-rw-r--r-- | Documentation/i2c/muxes/i2c-mux-gpio | 65 |
1 files changed, 65 insertions, 0 deletions
diff --git a/Documentation/i2c/muxes/i2c-mux-gpio b/Documentation/i2c/muxes/i2c-mux-gpio new file mode 100644 index 000000000000..bd9b2299b739 --- /dev/null +++ b/Documentation/i2c/muxes/i2c-mux-gpio @@ -0,0 +1,65 @@ +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, + }, +}; |