linux-kernel - Re: [PATCH v4 4/4] phy: add phy-hi6220-usb

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Message-ID: <54E70C0F.1030601@linaro.org>
Date:	Fri, 20 Feb 2015 18:27:27 +0800
From:	zhangfei <zhangfei.gao@...aro.org>
To:	balbi@...com
CC:	Kishon Vijay Abraham I <kishon@...com>, mark.rutland@....com,
	Peter Chen <peter.chen@...escale.com>,
	Sergei Shtylyov <sergei.shtylyov@...entembedded.com>,
	"dan . zhao" <dan.zhao@...ilicon.com>,
	Wangbinghui <wangbinghui@...ilicon.com>,
	linux-kernel@...r.kernel.org, linux-arm-kernel@...ts.infradead.org,
	devicetree@...r.kernel.org, linux-usb@...r.kernel.org
Subject: Re: [PATCH v4 4/4] phy: add phy-hi6220-usb



On 02/20/2015 12:38 PM, Felipe Balbi wrote:
> On Fri, Feb 20, 2015 at 11:07:21AM +0800, zhangfei wrote:
>> Hi, Balbi
>>
>> On 02/18/2015 10:35 PM, Felipe Balbi wrote:
>>> On Wed, Feb 18, 2015 at 01:44:21PM +0800, zhangfei wrote:
>>>> Hi, Kishon
>>>>
>>>> On 02/18/2015 01:35 PM, Kishon Vijay Abraham I wrote:
>>>>> Hi,
>>>>>
>>>>> On Thursday 12 February 2015 01:07 PM, Zhangfei Gao wrote:
>>>>>> Add usb phy controller for hi6220 platform
>>>>>>
>>>>>> Signed-off-by: Zhangfei Gao <zhangfei.gao@...aro.org>
>>>>>> ---
>>>>>>   drivers/phy/Kconfig          |   9 ++
>>>>>>   drivers/phy/Makefile         |   1 +
>>>>>>   drivers/phy/phy-hi6220-usb.c | 306
>>>>>> +++++++++++++++++++++++++++++++++++++++++++
>>>>>>   3 files changed, 316 insertions(+)
>>>>>>   create mode 100644 drivers/phy/phy-hi6220-usb.c
>>>>>
>>>>> why is this driver in drivers/phy when it doesn't use the generic PHY
>>>>> framework at all?
>>>>>
>>>>
>>>> Balbi recommended "new drivers only on drivers/phy/", including usb
>>>> phy.
>>>
>>> but it should use the API too. It's not only about a directory, you need
>>> to use the new API.
>>>
>>>> So Move drivers/usb/phy/phy-hi6220-usb.c to
>>>> drivers/phy/phy-hi6220-usb.c, required by Balbi.
>>>
>>> you're reading what I stated the way you like.
>>
>> Sorry for my bad understanding.
>>
>> Still not clear about the otg_set_peripheral, which is required in
>> phy-hi6220-usb.c
>>
>> 1. drivers/usb/dwc2/gadget.c use
>> otg_set_peripheral(hsotg->uphy->otg, &hsotg->gadget);
>>
>> 2. include/linux/phy/phy.h
>> struct phy do not have member otg, while struct usb_phy has.
>>
>> Could you give more hints?
>
> your set_peripheral doesn't do anything, just holds a pointer. Might as
> well not implement it. I'll review your driver more fully tomorrow.
>
> There a few things which must be changed.
>

Thanks in advance.

We need this call back set_peripheral setting otg->gadget, which used in 
usb_gadget_connect/disconnect(otg->gadget).

The workable method test here is not provide phy-names = "usb2-phy";
Then dwc2 will still use hsotg->uphy instead of hsotg->phy.
Though devm_phy_create is used in phy-hi6220-usb.c, phy_ops is not used 
in fact.

Thanks

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