Re: [PATCH v4 2/3] usb: phy: Add Qualcomm SS-USB and HS-USB driversfor DWC3 core

[Ivan T. Ivanov]

Hi, 

On Tue, 2013-08-20 at 09:33 -0500, Felipe Balbi wrote: 
> On Tue, Aug 20, 2013 at 05:09:11PM +0300, Ivan T. Ivanov wrote:
> > Hi,
> > 
> > On Tue, 2013-08-20 at 08:37 -0500, Felipe Balbi wrote: 
> > > Hi,
> > > 
> > > On Tue, Aug 20, 2013 at 04:32:23PM +0300, Ivan T. Ivanov wrote:
> > > > > On Tue, Aug 20, 2013 at 12:56:04PM +0300, Ivan T. Ivanov wrote:
> > > > > > From: "Ivan T. Ivanov" <iivanov@xxxxxxxxxx>
> > > > > > 
> > > > > > These drivers handles control and configuration of the HS
> > > > > > and SS USB PHY transceivers. They are part of the driver
> > > > > > which manage Synopsys DesignWare USB3 controller stack
> > > > > > inside Qualcomm SoC's.
> > > > > > 
> > > > > > Signed-off-by: Ivan T. Ivanov <iivanov@xxxxxxxxxx>
> > > > > > ---
> > > > > >  drivers/usb/phy/Kconfig           |   11 ++
> > > > > >  drivers/usb/phy/Makefile          |    2 +
> > > > > >  drivers/usb/phy/phy-msm-dwc3-hs.c |  327 ++++++++++++++++++++++++++++++++
> > > > > >  drivers/usb/phy/phy-msm-dwc3-ss.c |  374 +++++++++++++++++++++++++++++++++++++
> > > > > 
> > > > > please rename these PHY drivers, they have nothing to do with DWC3. PHYs
> > > > > don't care about the USB controller.
> > > > 
> > > > I think they are SNPS DesignWare PHY's, additionally
> > > > wrapped with Qualcomm logic. I could substitute "dwc3"
> > > > with just "dw", which will be more correct.
> > > 
> > > alright, thank you. Let's add Paul to the loop since he might have very
> > > good insight in the synopsys PHYs.
> > > 
> > > mental note: if any other platform shows up with Synopsys PHY, ask them
> > > to use this driver instead :-)
> > 
> > I really doubt that this will bi possible. Control of the PHY's is
> > not directly trough ULPI, UTMI or PIPE3 interfaces, but trough
> > QSCRATCH registers, which of course is highly Qualcomm specific.
> 
> isn't it a memory mapped IP ? doesn't synopsys provide their own set of
> registers ?

>From what I see it is not directly mapped. How QSCRATCH write and
reads transactions are translated to DW IP is unclear to me.

Ivan




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