linux-kernel - Re: [PATCH 1/5] drivers: usb: phy: add a new driver for omap usb2 phy

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Message-ID: <CAAe_U6KHk1nuSBVn-4H397wzUk0cnqGe_H0D8RVqrSFYGJVMCg@mail.gmail.com>
Date:	Fri, 28 Sep 2012 15:37:37 +0530
From:	"ABRAHAM, KISHON VIJAY" <kishon@...com>
To:	"Cousson, Benoit" <b-cousson@...com>
Cc:	Rob Herring <robherring2@...il.com>, grant.likely@...retlab.ca,
	rob@...dley.net, tony@...mide.com, linux@....linux.org.uk,
	balbi@...com, gregkh@...uxfoundation.org,
	devicetree-discuss@...ts.ozlabs.org, linux-doc@...r.kernel.org,
	linux-kernel@...r.kernel.org, linux-omap@...r.kernel.org,
	linux-arm-kernel@...ts.infradead.org, linux-usb@...r.kernel.org
Subject: Re: [PATCH 1/5] drivers: usb: phy: add a new driver for omap usb2 phy

Hi,

On Fri, Sep 28, 2012 at 4:18 AM, Cousson, Benoit <b-cousson@...com> wrote:
> On 9/27/2012 7:24 AM, Rob Herring wrote:
>>
>> On 09/25/2012 05:06 AM, ABRAHAM, KISHON VIJAY wrote:
>>>
>>> Hi,
>>>
>>> On Mon, Sep 24, 2012 at 6:45 PM, Rob Herring <robherring2@...il.com>
>>> wrote:
>>>>
>>>> On 09/06/2012 09:57 AM, Kishon Vijay Abraham I wrote:
>>>>>
>>>>> All phy related programming like enabling/disabling the clocks,
>>>>> powering
>>>>> on/off the phy is taken care of by this driver. It is also used for OTG
>>>>> related functionality like srp.
>>>>>
>>>>> This also includes device tree support for usb2 phy driver and
>>>>> the documentation with device tree binding information is updated.
>>>>>
>>>>> Currently writing to control module register is taken care in this
>>>>> driver which will be removed once the control module driver is in
>>>>> place.
>>>>>
>>>>> Cc: Felipe Balbi <balbi@...com>
>>>>> Signed-off-by: Kishon Vijay Abraham I <kishon@...com>
>>>>> ---
>>>>>   Documentation/devicetree/bindings/usb/usb-phy.txt |   17 ++
>>>>>   drivers/usb/phy/Kconfig                           |    9 +
>>>>>   drivers/usb/phy/Makefile                          |    1 +
>>>>>   drivers/usb/phy/omap-usb2.c                       |  271
>>>>> +++++++++++++++++++++
>>>>>   include/linux/usb/omap_usb.h                      |   46 ++++
>>>>>   include/linux/usb/phy_companion.h                 |   34 +++
>>>>>   6 files changed, 378 insertions(+)
>>>>>   create mode 100644 Documentation/devicetree/bindings/usb/usb-phy.txt
>>>>>   create mode 100644 drivers/usb/phy/omap-usb2.c
>>>>>   create mode 100644 include/linux/usb/omap_usb.h
>>>>>   create mode 100644 include/linux/usb/phy_companion.h
>>>>>
>>>>> diff --git a/Documentation/devicetree/bindings/usb/usb-phy.txt
>>>>> b/Documentation/devicetree/bindings/usb/usb-phy.txt
>>>>> new file mode 100644
>>>>> index 0000000..80d4148
>>>>> --- /dev/null
>>>>> +++ b/Documentation/devicetree/bindings/usb/usb-phy.txt
>>>>
>>>>
>>>> This is a very generic name...
>>>>
>>>>> @@ -0,0 +1,17 @@
>>>>> +USB PHY
>>>>> +
>>>>> +OMAP USB2 PHY
>>>>> +
>>>>> +Required properties:
>>>>> + - compatible: Should be "ti,omap-usb2"
>>>>
>>>>
>>>> ...for a specific phy. However, I do think a generic binding to describe
>>>> host ctrlr to phy connections is needed.
>>>>
>>>>> + - reg : Address and length of the register set for the device. Also
>>>>> +add the address of control module dev conf register until a driver for
>>>>> +control module is added
>>>>
>>>>
>>>> The dts should describe the h/w, not what you need for the current
>>>> driver. The 2nd reg field does not belong here.
>>>
>>>
>>> Indeed. This was discussed and agreed upon as a interim solution till
>>> we have a control module driver in place to write to the control
>>> module register.
>>
>>
>> Discussed where and agreed by who? I for one do not agree.
>
>
> Yeah, what was tolerated was the addition of that address inside hwmod data,
> but I do agree that it should not go into DTS.

So how can we handle reg writes to control module until we have a
control module driver. usb2 phy does not have a hwmod data for itself.
Do you think we should add a new hwmod data for usb2 phy and use this
in the usb2phy data node in the dts file?

Thanks
Kishon
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