On Mon, May 29, 2017 at 04:15:36PM +0200, Johan Hovold wrote:
> On Mon, May 29, 2017 at 11:01:52AM +0200, Martin Fuzzey wrote:
> > Hi Peter,
> >
> > I'm trying to create device tree nodes for USB devices (use case a USB
> > device providing GPIO and I2C controllers)
> >
> > Your patch (now merged)
> > 69bec725 "USB: core: let USB device know device node"
> >
> > looks just like what I need but I have a couple of problems.
> >
> > First it doesn't work at all on an i.MX53 because the actual struct
> > device for the USB host controller is a "ci_hdrc" which is a child of
> > the device having the DT node (ci_hdrc_imx)
>
> I believe you should set the new sysdev pointer to the parent controller
> device, which has the device tree node. Take a look at a8c06e407ef9
> ("usb: separate out sysdev pointer from usb_bus").
>
> > However my larger question is that I don't see how to associate a DT
> > node with a USB *interface* rather than a USB *device*.
>
> I started looking into this a while back but got interrupted. I have
> some preliminary code, mostly lacking associated documentation.
>
Johan has already supplied the correct answer and related code, if you
would like see how USB device work based on DT, please check my power
sequence patch set:
http://www.spinics.net/lists/linux-usb/msg157134.html
--
Best Regards,
Peter Chen
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