Received-SPF: pass (google.com: best guess record for domain of linux-kernel-owner@vger.kernel.org designates 209.132.180.67 as permitted sender) client-ip=209.132.180.67;
MIME-Version: 1.0
References: <20190215163220.20041-1-paul.kocialkowski@bootlin.com>
 <387ed483-b205-beda-319d-6f2b8ea55601@gmail.com> <38f6708476e9beca4583ccc2a62e238a4981b735.camel@bootlin.com>
 <958bb823-3dc8-607f-3c38-3d902acb85a8@gmail.com> <b0f700f85cd35bf26a97280f3bef7c4e87102d63.camel@bootlin.com>
 <20190219172515.GC13075@lunn.ch> <f0020e39-7ace-e1e0-e629-b84d6f92b841@xilinx.com>
 <adbb183836e22dfc4558beaa818677c24bacf3a8.camel@bootlin.com>
 <9cb2f7a8-a8cf-ef80-d260-cc67c072b5c5@xilinx.com> <8bb813fb-102b-00c9-fb6f-a3e928965051@xilinx.com>
 <CAFcVECJPtc3VQjK4WLCz1Wc4nopXnsLTKXFFY1ZpecgC+_PhyA@mail.gmail.com>
In-Reply-To: <CAFcVECJPtc3VQjK4WLCz1Wc4nopXnsLTKXFFY1ZpecgC+_PhyA@mail.gmail.com>
From:   Harini Katakam <harinik@xilinx.com>
Date:   Thu, 28 Feb 2019 13:03:35 +0530
Message-ID: <CAFcVECJ8G99XiqHpYYh=3Aj4Bt_2V4kfDdBmLQqpdo59BRjs-Q@mail.gmail.com>
Subject: Re: [PATCH RESEND net] net: phy: xgmiitorgmii: Support generic PHY
 status read
To:     Michal Simek <michal.simek@xilinx.com>
Cc:     Paul Kocialkowski <paul.kocialkowski@bootlin.com>,
        Andrew Lunn <andrew@lunn.ch>,
        Florian Fainelli <f.fainelli@gmail.com>,
        netdev@vger.kernel.org, linux-arm-kernel@lists.infradead.org,
        linux-kernel@vger.kernel.org,
        "David S . Miller" <davem@davemloft.net>,
        Thomas Petazzoni <thomas.petazzoni@bootlin.com>,
        Heiner Kallweit <hkallweit1@gmail.com>
Content-Type: text/plain; charset="UTF-8"
Sender: linux-kernel-owner@vger.kernel.org
Precedence: bulk

Hi,
On Wed, Feb 27, 2019 at 2:35 PM Harini Katakam <harinik@xilinx.com> wrote:
>
> Hi Andrew, Paul,
>
> On Wed, Feb 27, 2019 at 2:15 PM Michal Simek <michal.simek@xilinx.com> wrote:
> >
> > On 21. 02. 19 12:03, Michal Simek wrote:
> > > On 21. 02. 19 11:24, Paul Kocialkowski wrote:
> > >> Hi,
> > >>
> > >> On Wed, 2019-02-20 at 07:58 +0100, Michal Simek wrote:
> > >>> Hi,
> > >>>
> > >>> On 19. 02. 19 18:25, Andrew Lunn wrote:
<snip>
> > >> Understood. I think we need to start a discussion about how the general
> > >> design of this driver can be improved.
> > >>
> > >> In particular, I wonder if it could work better to make this driver a
> > >> PHY driver that just redirects all its ops to the actual PHY driver,
> > >> except for read_status where it should also add some code.
>
> Thanks, I'm looking into this option and also a way to expose the correct
> interface mode setting as you mentioned below. I'll get back before the
> end of the week. Please do let me know if you have any further suggestions.
>
This IP does not have a PHY identifier or status register that can be accessed
from the phy framework. We could discuss with our design team to add these
in the future. But that would take sometime and this version should be still be
supported. Also, if this IP has a PHY driver, then two phy drivers would have
to be probed which are connected in a serial manner and I believe I'll have to
update the framework to support that. Could you please let me know if you have
any inputs on this?
OR since this is just a bridge IP, is it acceptable to address the error cases?
-> Module loading/unloading
-> Spinlocks for protection
-> Correct phy mode information to the driver.
-> Any other concerns
I could do a respin of this patch after addressing Andrew's comments:
https://patchwork.kernel.org/patch/9290231/

Regards,
Harini