linux-kernel - Re: [PATCH v3 resend] USB: PHY: Re-organize Tegra USB PHY driver

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Date:	Mon, 22 Oct 2012 10:21:33 -0400 (EDT)
From:	Alan Stern <stern@...land.harvard.edu>
To:	Felipe Balbi <balbi@...com>
cc:	Stephen Warren <swarren@...dotorg.org>,
	Venu Byravarasu <vbyravarasu@...dia.com>,
	<gregkh@...uxfoundation.org>, <linux-usb@...r.kernel.org>,
	<linux-kernel@...r.kernel.org>
Subject: Re: [PATCH v3 resend] USB: PHY: Re-organize Tegra USB PHY driver

On Mon, 22 Oct 2012, Felipe Balbi wrote:

> Hi,
> 
> On Fri, Oct 19, 2012 at 10:29:35AM -0600, Stephen Warren wrote:
> > On 10/19/2012 09:35 AM, Felipe Balbi wrote:
> > > Hi,
> > > 
> > > On Fri, Oct 19, 2012 at 04:08:05PM +0530, Venu Byravarasu wrote:
> > >> NVIDIA produces several Tegra SoCs viz Tegra20, Tegra30 etc. In
> > >> order to support USB PHY drivers on these SoCs, existing PHY
> > >> driver is split into SoC agnostic common USB PHY driver and
> > >> Tegra20-specific USB phy driver. This will facilitate easy
> > >> addition and deletion of phy drivers for Tegra SoCs.
> > >> 
> > >> Signed-off-by: Venu Byravarasu <vbyravarasu@...dia.com>
> > > 
> > > I was reading this "driver" more closely and I have a bunch of
> > > questions about it, but the most important of all of them is: "why
> > > isn't that a real PHY driver ?". It doesn't have a probe()
> > > function, it doesn't use struct usb_phy to represent the PHY, it
> > > has a bunch of tegra-specific APIs and we can't let those
> > > continue.
> > 
> > One question here: If the PHY "driver" API changes, there will need to
> > be a bunch of ehci-tegra.c changes too. Will you take all those
> 
> hmm.. indeed.
> 
> > through the PHY tree? If you expect to do that, then I'd like to
> 
> I can take those if Alan is ok with it :-) Alan ?

I don't mind a bit.  It's kind of difficult for me to review changes to 
the platform-specific parts of the these drivers, anyway.  I have no 
way to test them and I'm not familiar with the interfaces involved.

Alan Stern

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