linux-kernel - Re: [PATCH v5 2/2] phy: qualcomm: Add Synopsys High-Speed USB PHY driver

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Message-ID: <20181220004737.GA16635@dragon>
Date:   Thu, 20 Dec 2018 08:47:40 +0800
From:   Shawn Guo <shawn.guo@...aro.org>
To:     Jack Pham <jackp@...eaurora.org>
Cc:     Kishon Vijay Abraham I <kishon@...com>,
        Rob Herring <robh+dt@...nel.org>,
        Sriharsha Allenki <sallenki@...eaurora.org>,
        Anu Ramanathan <anur@...eaurora.org>,
        Bjorn Andersson <bjorn.andersson@...aro.org>,
        Vinod Koul <vkoul@...nel.org>,
        Manu Gautam <mgautam@...eaurora.org>,
        linux-arm-msm@...r.kernel.org, devicetree@...r.kernel.org,
        linux-kernel@...r.kernel.org
Subject: Re: [PATCH v5 2/2] phy: qualcomm: Add Synopsys High-Speed USB PHY
 driver

On Wed, Dec 19, 2018 at 10:49:38AM -0800, Jack Pham wrote:
> Hi Shawn, Kishon,
> 
> On Wed, Dec 19, 2018 at 09:07:36AM +0800, Shawn Guo wrote:
> > On Tue, Dec 18, 2018 at 07:46:13PM +0530, Kishon Vijay Abraham I wrote:
> > > 
> > > 
> > > On 17/12/18 6:04 AM, Shawn Guo wrote:
> > > > On Tue, Dec 04, 2018 at 02:01:07PM +0800, Shawn Guo wrote:
> > > >> Hi Kishon,
> > > >>
> > > >> On Tue, Dec 04, 2018 at 10:38:19AM +0530, Kishon Vijay Abraham I wrote:
> > > >>> Hi,
> > > >>>
> > > >>> On 27/11/18 3:37 PM, Shawn Guo wrote:
> > > >>>> It adds Synopsys 28nm Femto High-Speed USB PHY driver support, which
> > > >>>> is usually paired with Synopsys DWC3 USB controllers on Qualcomm SoCs.
> > > >>>
> > > >>> Is this Synopsys PHY specific to Qualcomm or could it be used by other vendors
> > > >>> (with just changing tuning parameters)? If it could be used by other vendors
> > > >>> then it would make sense to add this PHY driver in synopsys directory.
> > > >>
> > > >> My knowledge is that this Synopsys PHY is specific to Qualcomm SoCs.
> > > >> @Sriharsha, correct me if I'm wrong.
> > > > 
> > > > Kishon,
> > > > 
> > > > Do you have any further comments on the patches?  We are close the 4.21
> > > > merge window, and I really hope they can hit mainline with 4.21 release.
> > > > Thanks.
> > > 
> > > Aren't we waiting for feedback from Sriharsha?
> > 
> > I think no correction means that I'm right :)
> 
> I'm sorry Sriharsha has not yet responded but I can confirm that this
> PHY driver would only be specific to Qualcomm SoCs simply because of our
> custom register mapping used to control and initialize it. These are
> only defined as as HW signals by the Synopsys IP, which have been
> synthesized to map to our own IO register space. So really it can be
> treated as just a "Qualcomm USB PHY" with acknowledgement that the core
> design is licensed from SNPS.

Thanks much for confirming, Jack.

Shawn