linux-kernel - Re: [PATCH RFC] usb: dwc3: Get PHY from platform specific dwc3 dt node.

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Date:	Fri, 1 Mar 2013 08:41:29 +0200
From:	Felipe Balbi <balbi@...com>
To:	Vivek Gautam <gautamvivek1987@...il.com>
CC:	Grant Likely <grant.likely@...retlab.ca>,
	Rob Herring <rob.herring@...xeda.com>,
	Felipe Balbi <balbi@...com>, kishon <kishon@...com>,
	Vivek Gautam <gautam.vivek@...sung.com>,
	<linux-usb@...r.kernel.org>, <linux-kernel@...r.kernel.org>,
	<linux-omap@...r.kernel.org>, <linux-samsung-soc@...r.kernel.org>,
	<gregkh@...uxfoundation.org>,
	<devicetree-discuss@...ts.ozlabs.org>,
	Andrew Morton <akpm@...ux-foundation.org>
Subject: Re: [PATCH RFC] usb: dwc3: Get PHY from platform specific dwc3 dt
 node.

Hi,

On Thu, Feb 28, 2013 at 08:09:33PM +0530, Vivek Gautam wrote:
> On Thu, Jan 31, 2013 at 9:08 PM, Felipe Balbi <balbi@...com> wrote:
> > On Thu, Jan 31, 2013 at 09:00:37PM +0530, Vivek Gautam wrote:
> >> Hi Felipe,
> >>
> >>
> >> On Thu, Jan 31, 2013 at 8:55 PM, Felipe Balbi <balbi@...com> wrote:
> >> > Hi,
> >> >
> >> > On Thu, Jan 31, 2013 at 08:53:27PM +0530, Vivek Gautam wrote:
> >> >> >> Moreover, SoCs having multiple dwc3 controllers will have multiple
> >> >> >> PHYs, which eventually be added using usb_add_phy_dev(), and not
> >> >> >> using usb_add_phy(). So each dwc3 controller won't be able to
> >> >> >> get PHYs by simply calling devm_usb_get_phy() also.
> >> >> >
> >> >> > No. We have added usb_get_phy_dev() for that purpose in the case of non-dt.
> >> >> > I think, instead you can have a patch to use devm_usb_get_phy_dev() here and
> >> >> > in exynos platform specific code use usb_bind_phy() to bind the phy and
> >> >> > controller till you change it to dt.
> >> >> >
> >> >>
> >> >> We have dt support for dwc3-exynos, in such case we should go ahead with
> >> >> of_platform_populate(), right ?
> >> >> But if when i use of_platform_populate() i will not be able to set
> >> >> dma_mask to dwc3->dev. :-(
> >> >
> >> > do you have a special need for dma_mask because OF already sets it.
> >> >
> >> If i am not wrong of_platform_device_create_pdata() will set
> >> "dev->dev.coherent_dma_mask = DMA_BIT_MASK(32)"
> >> and not dma_mask.
> >> I fact we had some discussion sometime back when we needed the same
> >> for dwc3-exynos in the thread:
> >> [PATCH v2 1/2] USB: dwc3-exynos: Add support for device tree
> >>
> >> But couldn't get final node on it.
> >> So suggestions here please. :-)
> >
> > hmm.. you're right there. Grant, Rob ? Any hints ?
> >
> 
> Any suggestions on this ?

anyone ?

-- 
balbi

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