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

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Date:	Wed, 20 Nov 2013 14:27:23 +0530
From:	Vivek Gautam <gautamvivek1987@...il.com>
To:	Kishon Vijay Abraham I <kishon@...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 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.

>
> Thanks
> Kishon



-- 
Best Regards
Vivek Gautam
Samsung R&D Institute, Bangalore
India
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