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

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Date:	Thu, 28 Feb 2013 20:09:33 +0530
From:	Vivek Gautam <gautamvivek1987@...il.com>
To:	Grant Likely <grant.likely@...retlab.ca>,
	Rob Herring <rob.herring@...xeda.com>
Cc:	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
Subject: Re: [PATCH RFC] usb: dwc3: Get PHY from platform specific dwc3 dt node.

Hi,

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 ?

> --
> balbi



-- 
Thanks & Regards
Vivek
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