diff options
author | Ionut Nicu <ioan.nicu.ext@nsn.com> | 2013-10-11 10:09:57 (GMT) |
---|---|---|
committer | Wolfram Sang <wsa@the-dreams.de> | 2013-10-30 16:29:46 (GMT) |
commit | 8c0ec2500eeb89749341884a972860d7f9e56f9c (patch) | |
tree | 752b7ce74d978d8254861dc617095b8335fe4c05 | |
parent | 250ad590d6f12d93f4d85be305b0a598d609232e (diff) | |
download | linux-fsl-qoriq-8c0ec2500eeb89749341884a972860d7f9e56f9c.tar.xz |
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
-rw-r--r-- | drivers/i2c/muxes/i2c-mux-gpio.c | 4 |
1 files changed, 2 insertions, 2 deletions
diff --git a/drivers/i2c/muxes/i2c-mux-gpio.c b/drivers/i2c/muxes/i2c-mux-gpio.c index cf93f10..3d12e85 100644 --- a/drivers/i2c/muxes/i2c-mux-gpio.c +++ b/drivers/i2c/muxes/i2c-mux-gpio.c @@ -38,7 +38,7 @@ static int i2c_mux_gpio_select(struct i2c_adapter *adap, void *data, u32 chan) { struct gpiomux *mux = data; - i2c_mux_gpio_set(mux, mux->data.values[chan]); + i2c_mux_gpio_set(mux, chan); return 0; } @@ -224,7 +224,7 @@ static int i2c_mux_gpio_probe(struct platform_device *pdev) unsigned int class = mux->data.classes ? mux->data.classes[i] : 0; mux->adap[i] = i2c_add_mux_adapter(parent, &pdev->dev, mux, nr, - i, class, + mux->data.values[i], class, i2c_mux_gpio_select, deselect); if (!mux->adap[i]) { ret = -ENODEV; |