linux-kernel - Re: [PATCHv6 01/19] usb: otg: Rename otg_transceiver to usb

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Message-ID: <20111109012237.GA2231@nchen-desktop>
Date:	Wed, 9 Nov 2011 09:22:38 +0800
From:	Peter Chen <peter.chen@...escale.com>
To:	"ABRAHAM, KISHON VIJAY" <kishon@...com>
CC:	Heikki Krogerus <heikki.krogerus@...ux.intel.com>,
	Felipe Balbi <balbi@...com>, Greg KH <gregkh@...e.de>,
	<linux-usb@...r.kernel.org>, <linux-kernel@...r.kernel.org>,
	Sascha Hauer <s.hauer@...gutronix.de>
Subject: Re: [PATCHv6 01/19] usb: otg: Rename otg_transceiver to usb_phy

On Tue, Nov 08, 2011 at 11:27:12AM +0530, ABRAHAM, KISHON VIJAY wrote:
> Hi Heikki,
> 
> On Fri, Oct 28, 2011 at 6:05 PM, Heikki Krogerus
> <heikki.krogerus@...ux.intel.com> wrote:
> > This is the first step in separating USB transceivers from
> > USB OTG utilities.
> >
> > Includes fixes to IMX code from Sascha Hauer.
> 
> I tend to defer with your opinion of renaming otg_transceiver to
> usb_phy. According to me otg_transceiver should program hardware
> mechanisms associated to VBUS, ID lines, etc.. and phy is responsible
> for transmitting data over differential data lines (with its own
> programming of phy_init, phy_shutdown, setting phy clocks etc..). So
> in my opinion otg_transceiver and usb_phy should be two different and
> separate entities.
> 
I am a little puzzled, are there two separate analog usb parts at OMap
's usb part? What the transceiver do? And what the phy do?
> I would have preferred to rename otg_transceiver as usb_otg as the
> first step. (this differs from your implementation where you rename
> otg_transceiver to usb_phy and create a new structure usb_otg to
> separate otg members from usb_phy).
> 
> But it should have been first  rename otg_transceiver as usb_otg. Then
> create a new structure usb_phy to move all the phy specific
> implementation there. This kind of implementation will also help when
> we want to have independent phy drivers.
> 
> Thanks
> Kishon
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-- 

Best Regards,
Peter Chen

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