linux-kernel - Re: [PATCH v2 2/2] phy dp83867: Make rgmii parameters optional

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Message-Id: <F97BCB11-9AA8-4510-93CA-D8D1F4FF92A5@suse.de>
Date:	Tue, 17 May 2016 22:45:41 +0200
From:	Alexander Graf <agraf@...e.de>
To:	Dan Murphy <dmurphy@...com>
Cc:	David Miller <davem@...emloft.net>, netdev@...r.kernel.org,
	linux-kernel@...r.kernel.org, michal.simek@...inx.com,
	andrew@...n.ch
Subject: Re: [PATCH v2 2/2] phy dp83867: Make rgmii parameters optional



> Am 17.05.2016 um 22:40 schrieb Dan Murphy <dmurphy@...com>:
> 
>> On 05/17/2016 03:37 PM, Alexander Graf wrote:
>> Hi David,
>> 
>>> Am 17.05.2016 um 20:48 schrieb David Miller <davem@...emloft.net>:
>>> 
>>> From: Dan Murphy <dmurphy@...com>
>>> Date: Tue, 17 May 2016 13:34:34 -0500
>>> 
>>>> David
>>>> 
>>>>> On 05/17/2016 01:22 PM, David Miller wrote:
>>>>> From: Alexander Graf <agraf@...e.de>
>>>>> Date: Mon, 16 May 2016 20:52:43 +0200
>>>>> 
>>>>>> If you compile without OF_MDIO support in an RGMII configuration, we fail
>>>>>> to configure the dp83867 phy today by writing garbage into its configuration
>>>>>> registers.
>>>>>> 
>>>>>> On the other hand if you do compile with OF_MDIO and the phy gets loaded via
>>>>>> device tree, you have to have the properties set in the device tree, otherwise
>>>>>> we fail to load the driver and don't even attach the generic phy driver to
>>>>>> the interface anymore.
>>>>>> 
>>>>>> To make things slightly more consistent, make the rgmii configuration properties
>>>>>> optional and allow a user to omit them in their device tree.
>>>>>> 
>>>>>> Signed-off-by: Alexander Graf <agraf@...e.de>
>>>>> Applied.
>>>> This patch should not have been applied.
>>>> 
>>>> I did not believe the implementation was proper for that driver.
>>>> 
>>>> It seems my objection to the code was not seen.  Nor was Andrew's point about the DT bindings document
>>>> 
>>>> https://patchwork.kernel.org/patch/9105371/
>>> The discussions around the recent phy patches have been a labrynth that I've
>>> found hard to follow, sorry.
>>> 
>>> I'll revert these two, sigh....
>> The first patch is an obvious and correct fix. Discussions were only about the second one (which I'm happy to drop given the rat hole this turned out to be).
> 
> So are you going to abandon the second patch all together?
> If you do, let me know I can submit a patch.

I'm fairly sure you'll be done with it much quicker than me and the real bug I wanted to fix is that the driver broke with OF_MDIO=m ;)

So yes, please take over from here.


Alex