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

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Date:	Tue, 8 Nov 2011 11:27:12 +0530
From:	"ABRAHAM, KISHON VIJAY" <kishon@...com>
To:	Heikki Krogerus <heikki.krogerus@...ux.intel.com>
Cc:	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

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 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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