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

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Message-ID: <CAFp+6iHvKYiF_neANRq5roAEJwhvcaLk7pAd7Dy94Z5XiDkhgA@mail.gmail.com>
Date:	Thu, 31 Jan 2013 21:00:37 +0530
From:	Vivek Gautam <gautamvivek1987@...il.com>
To:	balbi@...com
Cc:	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
Subject: Re: [PATCH RFC] usb: dwc3: Get PHY from platform specific dwc3 dt node.

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. :-)


-- 
Thanks & Regards
Vivek
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