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

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Message-ID: <20121022101623.GM14033@arwen.pp.htv.fi>
Date:	Mon, 22 Oct 2012 13:16:23 +0300
From:	Felipe Balbi <balbi@...com>
To:	Venu Byravarasu <vbyravarasu@...dia.com>
CC:	"balbi@...com" <balbi@...com>,
	"stern@...land.harvard.edu" <stern@...land.harvard.edu>,
	"gregkh@...uxfoundation.org" <gregkh@...uxfoundation.org>,
	"linux-usb@...r.kernel.org" <linux-usb@...r.kernel.org>,
	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH v3 resend] USB: PHY: Re-organize Tegra USB PHY driver

Hi,

On Mon, Oct 22, 2012 at 03:47:02PM +0530, Venu Byravarasu wrote:
> > -----Original Message-----
> > From: Felipe Balbi [mailto:balbi@...com]
> > Sent: Monday, October 22, 2012 3:33 PM
> > To: Venu Byravarasu
> > Cc: balbi@...com; stern@...land.harvard.edu;
> > 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
> > 
> > * PGP Signed by an unknown key
> > 
> > Hi,
> > 
> > On Mon, Oct 22, 2012 at 02:00:00PM +0530, Venu Byravarasu wrote:
> > > > -----Original Message-----
> > > > From: Felipe Balbi [mailto:balbi@...com]
> > > > Sent: Friday, October 19, 2012 9:06 PM
> > > > To: Venu Byravarasu
> > > > Cc: stern@...land.harvard.edu; gregkh@...uxfoundation.org;
> > > > balbi@...com; linux-usb@...r.kernel.org; linux-kernel@...r.kernel.org
> > > > Subject: Re: [PATCH v3 resend] USB: PHY: Re-organize Tegra USB PHY
> > driver
> > > >
> > > > > Old Signed by an unknown key
> > > >
> > > > Hi,
> > > >
> > > > On Fri, Oct 19, 2012 at 04:08:05PM +0530, Venu Byravarasu wrote:
> > > > > NVIDIA produces several Tegra SoCs viz Tegra20, Tegra30 etc.
> > > >
> > > > 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.
> > > >
> > > > Please, take a look at drivers/usb/phy/omap_usb2.c (misnamed actually,
> > > > should be phy-omap-usb2.c so we have a common prefix) to see how
> > your
> > > > PHY driver should look like and which sort of functionality if should
> > > > expose to the rest of the kernel.
> > >
> > > Hi Felipe,
> > >
> > > I'll go through omap phy driver and prepare similar patches for tegra
> > > phy driver and push them with upcoming patches.
> > > As current patch is mostly re-organizing the existing phy driver, can
> > > you plz merge This as is?
> > 
> > I would have to convince me about the need for that (and I'm open to be
> > convinced ;-), because if a later series of patches will come getting
> > rid of the current driver and turning it into a real PHY driver, I don't
> > see the benefit of taking $SUBJECT.
> > 
> 
> Hi Felipe,
> 
> The current patch splits out the existing tegra USB phy driver into two parts, as
> you would have already noticed from the code.
> The probe and etc changes that you asked to add, will be applicable to common
> Phy driver and should not have any implications on SOC dependent phy driver.

what is this SOC dependent PHY driver ? What sort of dependencies are
there ? Those differences should be handled with runtime checks.

-- 
balbi

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