linux-kernel - Re: [PATCH 0/5] Enhancements to twl4030 phy to support better charging

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Date:	Thu, 26 Mar 2015 05:29:42 +0530
From:	Kishon Vijay Abraham I <kishon@...com>
To:	NeilBrown <neilb@...e.de>
CC:	NeilBrown <neil@...wn.name>, Tony Lindgren <tony@...mide.com>,
	<linux-api@...r.kernel.org>,
	GTA04 owners <gta04-owner@...delico.com>,
	<linux-kernel@...r.kernel.org>, Pavel Machek <pavel@....cz>
Subject: Re: [PATCH 0/5] Enhancements to twl4030 phy to support better charging
 - V2

Hi NeilBrown,

On Thursday 26 March 2015 02:52 AM, NeilBrown wrote:
> On Thu, 26 Mar 2015 02:46:32 +0530 Kishon Vijay Abraham I <kishon@...com>
> wrote:
> 
>> Hi,
>>
>> On Monday 23 March 2015 04:05 AM, NeilBrown wrote:
>>> Hi Kishon,
>>>  I wonder if you could queue the following for the next merge window.
>>>  They allow the twl4030 phy to provide more information to the
>>>  twl4030 battery charger.
>>>  There are only minimal changes since the first version, particularly
>>>  documentation has been improved.
>>
>> There are quite a few things in this series which use the USB PHY library
>> interface which is kindof deprecated. We should try and use the Generic PHY
>> library for all of them. It would also be better to add features to the
>> PHY framework if the we can't achieve something with the existing PHY
>> framework.
> 
> Hi,
>  are you able to more specific at all?  What is the "USB PHY library"?
> Where exactly is the "PHY framework"?

There is a USB PHY library that exists in drivers/usb/phy/phy.c and there is
a Generic PHY framework that is present in drivers/phy/phy-core.c. twl4030
actually supports both the framework.

In your patch whatever uses struct usb_phy uses the old USB PHY library and
whatever uses struct phy uses the generic PHY framework. (Actually your patch
does not use the PHY framework at all). We want to deprecate using the USB PHY
library and make everyone use the generic PHY framework. Adding features
to a driver using the USB PHY library will make the transition to generic PHY
framework a bit more difficult.

Now all the features that is supported in the USB PHY library may not be
supported by the PHY framework. So we should start extending the PHY framework
instead of using the USB PHY library.

One think I noticed in your driver is using atomic notifier chain. IMO extcon
framework should be used in twl4030 USB driver to notify the controller driver
instead of using USB PHY notifier. For all other things we have to see if it
can be added in the PHY framework.

Thanks
Kishon
> 
> I know none of the history here and while I could try to guess I suspect
> there is an even chance I would get wrong.
> I'm happy to do the work but I want to be sure of what you are asking.
> 
> Thanks,
> NeilBrown
> 
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