linux-kernel - Re: [PATCH 01/15] drivers: phy: add generic PHY framework

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Date:	Tue, 23 Jul 2013 11:04:53 +0530
From:	Kishon Vijay Abraham I <kishon@...com>
To:	Greg KH <gregkh@...uxfoundation.org>
CC:	Alan Stern <stern@...land.harvard.edu>,
	Sylwester Nawrocki <sylvester.nawrocki@...il.com>,
	Sascha Hauer <s.hauer@...gutronix.de>,
	<kyungmin.park@...sung.com>, <balbi@...com>, <jg1.han@...sung.com>,
	<s.nawrocki@...sung.com>, <kgene.kim@...sung.com>,
	<grant.likely@...aro.org>, <tony@...mide.com>, <arnd@...db.de>,
	<swarren@...dia.com>, <devicetree-discuss@...ts.ozlabs.org>,
	<linux-doc@...r.kernel.org>, <linux-kernel@...r.kernel.org>,
	<linux-arm-kernel@...ts.infradead.org>,
	<linux-samsung-soc@...r.kernel.org>, <linux-omap@...r.kernel.org>,
	<linux-usb@...r.kernel.org>, <linux-media@...r.kernel.org>,
	<linux-fbdev@...r.kernel.org>, <akpm@...ux-foundation.org>,
	<balajitk@...com>, <george.cherian@...com>, <nsekhar@...com>
Subject: Re: [PATCH 01/15] drivers: phy: add generic PHY framework

Hi,

On Monday 22 July 2013 08:34 PM, Greg KH wrote:
> On Mon, Jul 22, 2013 at 12:55:18PM +0530, Kishon Vijay Abraham I wrote:
>>> 	The issue (or one of the issues) in this discussion is that 
>>> 	Greg does not like the idea of using names or IDs to associate
>>> 	PHYs with controllers, because they are too prone to
>>> 	duplications or other errors.  Pointers are more reliable.
>>>
>>> 	But pointers to what?  Since the only data known to be 
>>> 	available to both the PHY driver and controller driver is the
>>> 	platform data, the obvious answer is a pointer to platform data
>>> 	(either for the PHY or for the controller, or maybe both).
>>
>> hmm.. it's not going to be simple though as the platform device for the PHY and
>> controller can be created in entirely different places. e.g., in some cases the
>> PHY device is a child of some mfd core device (the device will be created in
>> drivers/mfd) and the controller driver (usually) is created in board file. I
>> guess then we have to come up with something to share a pointer in two
>> different files.
> 
> What's wrong with using the platform_data structure that is unique to
> all boards (see include/platform_data/ for examples)?  Isn't that what
> this structure is there for?

Alright. I got some ideas from Alan Stern. I'll use it with platform_data and
repost the series.

Thanks
Kishon
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