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author | Ionut Nicu <ioan.nicu.ext@nsn.com> | 2013-10-11 12:09:57 +0200 |
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committer | Wolfram Sang <wsa@the-dreams.de> | 2013-10-30 17:29:46 +0100 |
commit | 8c0ec2500eeb89749341884a972860d7f9e56f9c (patch) | |
tree | 752b7ce74d978d8254861dc617095b8335fe4c05 /include | |
parent | 250ad590d6f12d93f4d85be305b0a598d609232e (diff) | |
download | op-kernel-dev-8c0ec2500eeb89749341884a972860d7f9e56f9c.zip op-kernel-dev-8c0ec2500eeb89749341884a972860d7f9e56f9c.tar.gz |
i2c: mux: gpio: use reg value for i2c_add_mux_adapter
The i2c-mux driver requires that the chan_id parameter
passed to the i2c_add_mux_adapter() function is equal
to the reg value for that adapter:
for_each_child_of_node(mux_dev->of_node, child) {
ret = of_property_read_u32(child, "reg", ®);
if (ret)
continue;
if (chan_id == reg) {
priv->adap.dev.of_node = child;
break;
}
}
The i2c-mux-gpio driver uses an internal logical index
for chan_id when calling i2c_add_mux_adapter() instead
of using the reg value.
Because of this, there will problems in selecting the
right adapter when the i2c-mux-gpio's index into
mux->data.values doesn't match the reg value.
An example of such a case:
mux->data.values = { 1, 0 }
For chan_id = 0, i2c-mux will bind the adapter to the
of_node with reg = <0>, but when it will call the
select() callback with chan_id set to 0, the i2c-mux-gpio
will use it as an index into mux->data.values and it will
actually select the bus with reg = <1>.
Signed-off-by: Ionut Nicu <ioan.nicu.ext@nsn.com>
Acked-by: Alexander Sverdlin <alexander.sverdlin@nsn.com>
Signed-off-by: Wolfram Sang <wsa@the-dreams.de>
Cc: stable@kernel.org
Diffstat (limited to 'include')
0 files changed, 0 insertions, 0 deletions