Re: DT parsing : duplicate name error

From: Jean-Michel Hautbois
Date: Wed Dec 03 2014 - 11:10:19 EST

2014-12-03 17:07 GMT+01:00 Grant Likely <grant.likely@xxxxxxxxxxxx>:
> On Wed, Dec 3, 2014 at 4:04 PM, Fabio Estevam <festevam@xxxxxxxxx> wrote:
>> On Wed, Dec 3, 2014 at 1:41 PM, Grant Likely <grant.likely@xxxxxxxxxxxx> wrote:
>>> From a quick reading of the backlog, for some reason the new device is
>>> getting assigned NULL as the device name in led_classdev_register().
>>> Probably because led_cdev->name is set to NULL. The leds are getting
>>> bound to the LED driver in gpio_led_probe() which is the non-DT path
>>> for creating LED devices. That would mean there is pdata attached to
>>> the LED device, but I haven't dug any farther than that. Really need
>>> the bisect to narrow down what is going on.
>> Ok, so this issue happens when two or more gpio-leds do not contain
>> the 'label' property.
>> 'label' is an optional property according to
>> Documentation/devicetree/bindings/leds/common.txt:
>> "Optional properties for child nodes:
>> - label : The label for this LED. If omitted, the label is
>> taken from the node name (excluding the unit address)."
>> This works fine on 3.17.1 as we used to have this logic in leds-gpio:
>> = of_get_property(child, "label", NULL) ? : child->name;
>> ,but since commit a43f2cbbb009f96 ("leds: leds-gpio: Make use of
>> device property API "), this is no longer true:
>> + fwnode_property_read_string(child, "label", &;
>> If 'label' is not present then both of the LEDs will have the same
>> name and then the duplicate name error will happen.
>> So we would need something like this:
>> if (fwnode_property_present(child, "label"))
>> fwnode_property_read_string(child, "label", &;
>> else
>> get the name from the child ---> This is what I am not sure how
>> to do after the conversion to use fwnode_handle.
> Ah, that makes sense. The device properties change needs to be
> reworked/fixed up to have a DT specific part when the label property
> is missing. Either that or the device properties API needs to gain the
> ability to return the node name.

Nice catch Fabio :).
I like the idea of returning of node name when label is not specified in DT.

> Rafael, Thoughts?
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