On Wed, Nov 09, 2011 at 09:22:38AM +0800, Peter Chen wrote: > 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@xxxxxxxxxxxxxxx> 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? Kinda... there's one which is mostly digital inside the SoC handling data lines and also comunicating VBUS/ID levels to the link but the actual VBUS/ID comparators are outside of the SoC, inside the PMIC. It's a bit of a pain, but I understand why they did it that way. It's mostly for power management, although the same is likely to be achievable by keeping everything in the PMIC. -- balbi
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