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

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Message-ID: <CAAe_U6JqPCK-P8m=bmi73GyVtea72O1phvSEjobtoQLz=KA86w@mail.gmail.com>
Date:	Thu, 27 Sep 2012 20:30:03 +0530
From:	"ABRAHAM, KISHON VIJAY" <kishon@...com>
To:	Rob Herring <robherring2@...il.com>
Cc:	grant.likely@...retlab.ca, rob@...dley.net, b-cousson@...com,
	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 Thu, Sep 27, 2012 at 7:54 PM, Rob Herring <robherring2@...il.com> 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.

Please find the discussion @ https://patchwork.kernel.org/patch/1415261/

Thanks
Kishon
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