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

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Message-ID: <528C7B0E.3080401@ti.com>
Date:	Wed, 20 Nov 2013 14:34:14 +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

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?

Thanks
Kishon
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