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

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Date:	Thu, 31 Jan 2013 17:38:36 +0200
From:	Felipe Balbi <balbi@...com>
To:	Vivek Gautam <gautamvivek1987@...il.com>
CC:	<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>,
	Grant Likely <grant.likely@...retlab.ca>,
	Rob Herring <rob.herring@...xeda.com>,
	<devicetree-discuss@...ts.ozlabs.org>
Subject: Re: [PATCH RFC] usb: dwc3: Get PHY from platform specific dwc3 dt
 node.

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 ?

-- 
balbi

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