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;
Received-SPF: Pass (protection.outlook.com: domain of xilinx.com designates
 149.199.60.83 as permitted sender) receiver=protection.outlook.com;
 client-ip=149.199.60.83; helo=xsj-pvapsmtpgw01;
Subject: Re: [PATCH RESEND net] net: phy: xgmiitorgmii: Support generic PHY
 status read
To:     Paul Kocialkowski <paul.kocialkowski@bootlin.com>,
        Michal Simek <michal.simek@xilinx.com>,
        Andrew Lunn <andrew@lunn.ch>
CC:     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>
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>
From:   Michal Simek <michal.simek@xilinx.com>
Message-ID: <9cb2f7a8-a8cf-ef80-d260-cc67c072b5c5@xilinx.com>
Date:   Thu, 21 Feb 2019 12:03:44 +0100
User-Agent: Mozilla/5.0 (X11; Linux x86_64; rv:60.0) Gecko/20100101
 Thunderbird/60.4.0
MIME-Version: 1.0
In-Reply-To: <adbb183836e22dfc4558beaa818677c24bacf3a8.camel@bootlin.com>
Content-Type: text/plain; charset="utf-8"
Content-Language: en-US
Content-Transfer-Encoding: 7bit
X-MS-Exchange-CrossTenant-OriginalArrivalTime: 21 Feb 2019 11:03:56.9013
 (UTC)
X-MS-Exchange-CrossTenant-Network-Message-Id: 5fd57116-b6b3-4609-d9ee-08d697ec46be
X-MS-Exchange-CrossTenant-Id: 657af505-d5df-48d0-8300-c31994686c5c
X-MS-Exchange-CrossTenant-OriginalAttributedTenantConnectingIp: TenantId=657af505-d5df-48d0-8300-c31994686c5c;Ip=[149.199.60.83];Helo=[xsj-pvapsmtpgw01]
X-MS-Exchange-CrossTenant-FromEntityHeader: HybridOnPrem
X-MS-Exchange-Transport-CrossTenantHeadersStamped: SN6PR02MB4637
Sender: linux-kernel-owner@vger.kernel.org
Precedence: bulk
List-ID: <linux-kernel.vger.kernel.org>
X-Mailing-List: linux-kernel@vger.kernel.org

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:
>>>> Thanks for the suggestion! So I had a closer look at that driver to try
>>>> and see what could go wrong and it looks like I found a few things
>>>> there.
>>>
>>> Hi Paul
>>>
>>> Yes, this driver has issues. If i remember correctly, it got merged
>>> while i was on vacation. I pointed out a few issues, but the authors
>>> never responded. Feel free to fix it up.
>>
>> Will be good to know who was that person.
>>
>> I can't do much this week with this because responsible person for this
>> driver is out of office this week. That's why please give us some time
>> to get back to this.
> 
> 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.

I didn't take a look at Linux driver but it should work in a way that it
checks description (more below) and then wait for attached phy to do its
work and on the way back just setup this bridge based on that.

> Maybe we could also manage to expose a RGMII PHY mode to the actual PHY
> this way. Currently, the PHY mode has to be set to GMII for the MAC to
> be configured correctly, but the PHY also gets this information while
> it should be told that RGMII is in use. This doesn't seem to play a big
> role in PHY configuration though, but it's still inadequate.
> 
> What do you think?

I stop the driver to be applied to u-boot because exactly this
gmii/rgmii configuration. There is a need that mac is configured to gmii
and this needs to be checked but to phy rgmii needs to be exposed.
I was trying to find out hardware design and board where I can do some
experiments but didn't find out. That's why I need to wait for
colleagues to point me to that.

Thanks,
Michal