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of: i2c: add support for wakeup-source property

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Add support for specifying a generic "wakeup-source" property on i2c
clients, which will set the I2C_CLIENT_WAKE flag, thus configuring the
device to wake the system from suspend (via IRQ).

This obviously doesn't make sense on devices lacking IRQ, but since we
still allow that in the i2c_board_info case, I don't see a reason to
restrict it here.

Note: Since the generic i2c bindings aren't documented in the kernel,
I didn't find a good place to add documentation for this binding
extension. I still think it makes sense to have a generic property
instead of having each device do its own binding for the same.

Signed-off-by: Olof Johansson <olof@lixom.net>
Signed-off-by: Rob Herring <rob.herring@calxeda.com>
This commit is contained in:
Olof Johansson 2012-07-21 11:47:25 -07:00 committed by Rob Herring
parent e38c0a1fbc
commit ee67016fcc
1 changed files with 3 additions and 0 deletions
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drivers/of/of_i2c.c
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@ -61,6 +61,9 @@ void of_i2c_register_devices(struct i2c_adapter *adap)
info.of_node = of_node_get(node);
info.archdata = &dev_ad;
if (of_get_property(node, "wakeup-source", NULL))
info.flags |= I2C_CLIENT_WAKE;
request_module("%s%s", I2C_MODULE_PREFIX, info.type);
result = i2c_new_device(adap, &info);