Re: USB device nodes in device tree

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On Mon, 30 Mar 2015, Valentin Longchamp wrote:

> Hello,
> 
> We are currently developing a board with an USB MFD device (I2C and GPIOs are to
> be supported). The device is soldered on the board and is the only one on the
> bus, so the bus is not really "dynamic".
> 
> Since it's an USB device, it should be dynamically detected by the kernel and it
> would not require a node in the board's DTS. However, I need to have the devices
> which are "behind" the MFD USB device to be in the DTS (I2C bus topology, and
> some of the GPIOs are to be used directly by some other DTS nodes as well).
> 
> Is there a way to add a node for USB device in a DTS ? Is there an available
> example for this ?

No, there is no way to do it as far as I know.  The main problem is 
that Device Tree is static whereas USB devices are dynamic.

Alan Stern

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