linux-kernel - Re: [PATCH RFC 1/4] phy: Add new Exynos5 USB 3.0 PHY driver

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Message-ID: <529F3C1C.2050509@ti.com>
Date:	Wed, 4 Dec 2013 19:58:44 +0530
From:	Kishon Vijay Abraham I <kishon@...com>
To:	Vivek Gautam <gautamvivek1987@...il.com>
CC:	Jingoo Han <jg1.han@...sung.com>,
	Kamil Debski <k.debski@...sung.com>,
	Vivek Gautam <gautam.vivek@...sung.com>,
	Linux USB Mailing List <linux-usb@...r.kernel.org>,
	"linux-samsung-soc@...r.kernel.org" 
	<linux-samsung-soc@...r.kernel.org>,
	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
	"devicetree@...r.kernel.org" <devicetree@...r.kernel.org>,
	"linux-arm-kernel@...ts.infradead.org" 
	<linux-arm-kernel@...ts.infradead.org>,
	<linux-doc@...r.kernel.org>, Greg KH <gregkh@...uxfoundation.org>,
	Kukjin Kim <kgene.kim@...sung.com>,
	Sylwester Nawrocki <s.nawrocki@...sung.com>,
	Tomasz Figa <t.figa@...sung.com>, Felipe Balbi <balbi@...com>,
	Julius Werner <jwerner@...omium.org>
Subject: Re: [PATCH RFC 1/4] phy: Add new Exynos5 USB 3.0 PHY driver

Hi Vivek,

On Wednesday 20 November 2013 09:14 PM, Kishon Vijay Abraham I wrote:
> Hi,
> 
> On Wednesday 20 November 2013 03:02 PM, Vivek Gautam wrote:
>> On Wed, Nov 20, 2013 at 2:34 PM, Kishon Vijay Abraham I <kishon@...com> wrote:
>>> On Wednesday 20 November 2013 02:27 PM, Vivek Gautam wrote:
>>>> Hi Kishon,
>>>>
>>>>
>>>> On Mon, Nov 11, 2013 at 4:41 PM, Kishon Vijay Abraham I <kishon@...com> wrote:
>>>>> Hi,
>>>> sorry for the delayed response.
>>>>
>>>>>
>>>>> On Wednesday 06 November 2013 05:37 AM, Jingoo Han wrote:
>>>>>> On Wednesday, November 06, 2013 2:58 AM, Vivek Gautam wrote:
>>>>>>> On Tue, Nov 5, 2013 at 5:33 PM, Jingoo Han <jg1.han@...sung.com> wrote:
>>>>>>
>>>>>> [.....]
>>>>>>
>>>>>>>> USB3.0 PHY consists of two blocks such as 3.0 block and 2.0 block.
>>>>>>>> This USB3.0 PHY can support UTMI+ and PIPE3 interface for 3.0 block
>>>>>>>> and 2.0 block, respectively.
>>>>>>>>
>>>>>>>> Conclusion:
>>>>>>>>
>>>>>>>>    1) USB2.0 PHY: USB2.0 HOST, USB2.0 Device
>>>>>>>>                        Base address: 0x1213 0000
>>>>>>>>
>>>>>>>>    2) USB3.0 PHY: USB3.0 DRD (3.0 HOST & 3.0 Device)
>>>>>>>>                        Base address: 0x1210 0000
>>>>>>>>                        2.0 block(UTMI+) & 3.0 block(PIPE3)
>>>>>>>
>>>>>>> And this is of course the PHY used by DWC3 controller, which works at
>>>>>>> both High speed as well as Super Speed.
>>>>>>> Right ?
>>>>>>
>>>>>> Right.
>>>>>>
>>>>>> While 3.0 block(PIPE3) can be used for Super Speed, 2.0 block(UTMI+)
>>>>>> can be used for High speed.
>>>>>
>>>>> It should then come under *single IP muliple PHY* category similar to what
>>>>> Sylwester has done.
>>>>
>>>> Do you mean that i should be including PHY IDs for UTMI+ phy and PIPE3
>>>> phy present in this PHY block ?
>>>> AFAICS the two phys (UTMI+ and PIPE3) do not really have separate
>>>> registers to program, and that's the reason
>>>> we program the entire PHY in a shot.
>>>
>>> you mean you program the same set of bits for UTMI+ and PIPE3?
>>
>> No, looking closely into PHY datasheet as well as Exynos5250 manual, i
>> can see that UTMI+ and PIPE3
>> phys have separate bit settings. So i think we should be able to
>> segregate the two PHYs (UTMI+ and PIPE3).
>> Pardon me for my earlier observations.
> 
> no problem..
>> Let me clarify more with our h/w team also on this and then i will
>> confirm with this.

Did you get more information on this?

Thanks
Kishon
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