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

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Date:	Sat, 20 Jul 2013 19:59:10 -0700
From:	Greg KH <gregkh@...uxfoundation.org>
To:	Alan Stern <stern@...land.harvard.edu>
Cc:	Kishon Vijay Abraham I <kishon@...com>, 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

On Sat, Jul 20, 2013 at 10:32:26PM -0400, Alan Stern wrote:
> On Sat, 20 Jul 2013, Greg KH wrote:
> 
> > > >>That should be passed using platform data.
> > > >
> > > >Ick, don't pass strings around, pass pointers.  If you have platform
> > > >data you can get to, then put the pointer there, don't use a "name".
> > > 
> > > I don't think I understood you here :-s We wont have phy pointer
> > > when we create the device for the controller no?(it'll be done in
> > > board file). Probably I'm missing something.
> > 
> > Why will you not have that pointer?  You can't rely on the "name" as the
> > device id will not match up, so you should be able to rely on the
> > pointer being in the structure that the board sets up, right?
> > 
> > Don't use names, especially as ids can, and will, change, that is going
> > to cause big problems.  Use pointers, this is C, we are supposed to be
> > doing that :)
> 
> Kishon, I think what Greg means is this:  The name you are using must
> be stored somewhere in a data structure constructed by the board file,
> right?  Or at least, associated with some data structure somehow.  
> Otherwise the platform code wouldn't know which PHY hardware
> corresponded to a particular name.
> 
> Greg's suggestion is that you store the address of that data structure 
> in the platform data instead of storing the name string.  Have the 
> consumer pass the data structure's address when it calls phy_create, 
> instead of passing the name.  Then you don't have to worry about two 
> PHYs accidentally ending up with the same name or any other similar 
> problems.

Close, but the issue is that whatever returns from phy_create() should
then be used, no need to call any "find" functions, as you can just use
the pointer that phy_create() returns.  Much like all other class api
functions in the kernel work.

thanks,

greg k-h
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