linux-kernel - Re: [PATCH v3 5/6] usb: dwc3: use bus->sysdev for DMA configuration

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Date:   Mon, 14 Nov 2016 09:51:14 +0800
From:   Peter Chen <hzpeterchen@...il.com>
To:     Arnd Bergmann <arnd@...db.de>
Cc:     Felipe Balbi <felipe.balbi@...ux.intel.com>,
        Sriram Dash <sriram.dash@....com>,
        linux-kernel@...r.kernel.org, linux-usb@...r.kernel.org,
        mathias.nyman@...el.com, gregkh@...uxfoundation.org,
        suresh.gupta@....com, stern@...land.harvard.edu, pku.leo@...il.com
Subject: Re: [PATCH v3 5/6] usb: dwc3: use bus->sysdev for DMA configuration

On Fri, Nov 11, 2016 at 09:31:09PM +0100, Arnd Bergmann wrote:
> On Thursday, November 10, 2016 1:02:11 PM CET Felipe Balbi wrote:
> > > @@ -123,8 +119,8 @@ int dwc3_host_init(struct dwc3 *dwc)
> > >  void dwc3_host_exit(struct dwc3 *dwc)
> > >  {
> > >       phy_remove_lookup(dwc->usb2_generic_phy, "usb2-phy",
> > > -                       dev_name(&dwc->xhci->dev));
> > > +                       dev_name(dwc->dev));
> > >       phy_remove_lookup(dwc->usb3_generic_phy, "usb3-phy",
> > > -                       dev_name(&dwc->xhci->dev));
> > > +                       dev_name(dwc->dev));
> > 
> > this looks unrelated to $subject. Care to explain?
> 
> bus->sysdev is used for retrieving any information that comes from
> the platform (DT or otherwise), and the phy lookup in has to be done
> through sysdev as well because the platform cannot add it to
> the child device it has no knowledge of.
> 
> When we set the sysdev to the parent, the phy lookup has to be
> added to that device as well, rather than the child device.
> 

Then, the device should change to dwc->sysdev, and phy_create_lookup
in this file needs to change too.

-- 

Best Regards,
Peter Chen