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i2c-mux: Add support for device auto-detection

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Let I2C bus segments behind multiplexers have a class. This allows for
device auto-detection on these segments. As long as parent segments
don't share the same class, it should be fine.

I implemented support in drivers i2c-mux-gpio and i2c-mux-pca954x. I
left i2c-mux-pca9541 and i2c-mux-pinctrl alone for the moment as I
don't know if this feature makes sense for the use cases of these
drivers.

Signed-off-by: Jean Delvare <khali@linux-fr.org>
Cc: Peter Korsgaard <peter.korsgaard@barco.com>
Cc: David Daney <david.daney@cavium.com>
Cc: Michael Lawnick <ml.lawnick@gmx.de>
Cc: Rodolfo Giometti <giometti@linux.it>
This commit is contained in:
Jean Delvare 2012-10-05 22:23:51 +02:00 • committed by Jean Delvare
parent 5f3d2f2e1a
commit eee543e824
8 changed files with 37 additions and 7 deletions
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1
include/linux/i2c/pca954x.h
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@ -36,6 +36,7 @@
struct pca954x_platform_mode {
int adap_id;
unsigned int deselect_on_exit:1;
unsigned int class;
};
/* Per mux/switch data, used with i2c_register_board_info */