From: Laurent Pinchart <laurent.pinchart@ideasonboard.com>
To: Arnd Bergmann <arnd@arndb.de>
Cc: Tomasz Figa <tomasz.figa@gmail.com>,
        Alan Stern <stern@rowland.harvard.edu>,
        Tomasz Figa <t.figa@samsung.com>, Greg KH <gregkh@linuxfoundation.org>,
        Kishon Vijay Abraham I <kishon@ti.com>, broonie@kernel.org,
        Sylwester Nawrocki <sylvester.nawrocki@gmail.com>,
        Sascha Hauer <s.hauer@pengutronix.de>, kyungmin.park@samsung.com,
        balbi@ti.com, jg1.han@samsung.com, s.nawrocki@samsung.com,
        kgene.kim@samsung.com, grant.likely@linaro.org, tony@atomide.com,
        swarren@nvidia.com, devicetree@vger.kernel.org,
        linux-doc@vger.kernel.org, linux-kernel@vger.kernel.org,
        linux-arm-kernel@lists.infradead.org,
        linux-samsung-soc@vger.kernel.org, linux-omap@vger.kernel.org,
        linux-usb@vger.kernel.org, linux-media@vger.kernel.org,
        linux-fbdev@vger.kernel.org, akpm@linux-foundation.org,
        balajitk@ti.com, george.cherian@ti.com, nsekhar@ti.com, olof@lixom.net,
        Stephen Warren <swarren@wwwdotorg.org>, b.zolnierkie@samsung.com,
        Daniel Lezcano <daniel.lezcano@linaro.org>
Subject: Re: [PATCH 01/15] drivers: phy: add generic PHY framework
Date: Thu, 25 Jul 2013 13:10:10 +0200
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Hi Arnd,
On Thursday 25 July 2013 13:00:49 Arnd Bergmann wrote:
> On Thursday 25 July 2013, Laurent Pinchart wrote:
> > On Wednesday 24 July 2013 20:32:03 Arnd Bergmann wrote:
> > > On Tuesday 23 July 2013, Tomasz Figa wrote:
> > > > On Tuesday 23 of July 2013 17:14:20 Alan Stern wrote:
> > > > > On Tue, 23 Jul 2013, Tomasz Figa wrote:
> > > > > > Where would you want to have those phy_address arrays stored?
> > > > > > There are no board files when booting with DT. Not even saying
> > > > > > that you don't need to use any hacky schemes like this when you
> > > > > > have DT that nicely specifies relations between devices.
> > > > > 
> > > > > If everybody agrees DT has a nice scheme for specifying relations
> > > > > between devices, why not use that same scheme in the PHY core?
> > > > 
> > > > It is already used, for cases when consumer device has a DT node
> > > > attached. In non-DT case this kind lookup translates loosely to
> > > > something that is being done in regulator framework - you can't bind
> > > > devices by pointers, because you don't have those pointers, so you
> > > > need to use device names.
> > > 
> > > Sorry for jumping in to the middle of the discussion, but why does a new
> > > framework even bother defining an interface for board files?
> > > 
> > > Can't we just drop any interfaces for platform data passing in the phy
> > > framework and put the burden of adding those to anyone who actually
> > > needs them? All the platforms we are concerned with here (exynos and
> > > omap, plus new platforms) can be booted using DT anyway.
> > 
> > What about non-DT architectures such as MIPS (still widely used in
> > consumer networking equipments from what I've heard) ?
> 
> * Vendors of such equipment have started moving on to ARM (e.g. Broadcom
> bcm47xx)
> * Some of the modern MIPS platforms are now using DT
> * Legacy platforms probably won't migrate to either DT or the generic PHY
> framework
> 
> I'm not saying that we can't support legacy board files with the common PHY
> framework, but I'd expect things to be much easier if we focus on those
> platforms that are actively being worked on for now, to bring an end to the
> pointless API discussion.

Fair enough :-)

-- 
Regards,

Laurent Pinchart

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