linux-kernel - Re: [PATCH v2 net-next 2/3] net: ethernet: cadence-macb: Add fallback to read DT provided caps

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Date:	Tue, 8 Dec 2015 17:22:52 +0100
From:	Nicolas Ferre <nicolas.ferre@...el.com>
To:	Arnd Bergmann <arnd@...db.de>,
	Neil Armstrong <narmstrong@...libre.com>
CC:	<davem@...emloft.net>, <harini.katakam@...inx.com>,
	<boris.brezillon@...e-electrons.com>,
	<alexandre.belloni@...e-electrons.com>,
	<linux-kernel@...r.kernel.org>, <netdev@...r.kernel.org>,
	<devicetree@...r.kernel.org>, <joshc@...com>
Subject: Re: [PATCH v2 net-next 2/3] net: ethernet: cadence-macb: Add fallback
 to read DT provided caps

Le 08/12/2015 16:00, Arnd Bergmann a écrit :
> On Tuesday 08 December 2015 14:52:05 Neil Armstrong wrote:
>> Add 1:1 mapping of software defines caps parsing from DT in case the
>> generic macb compatible form is used.
>> These properties will provide support for futures implementations
>> only defined from DT without need to update the driver code to support
>> new variants.
>>
>> Signed-off-by: Neil Armstrong <narmstrong@...libre.com>
>>
> 
> Translating the Linux implementation specific configuration into
> DT properties directly is usually not the best way.
> 
> Could we instead have a lookup table by compatible string to set the
> flags? It seems that there are lots of different flags but only a
> couple of different users of this IP block. Also, the fact that
> you are now adding yet another quirk tells me that the set you
> define today is unlikely to cover all the future requirements.

This is basically what I told Neil in my previous email.

I understand you point Neil, but I don't find it makes sense and Arnd
described it better that I did.
So please find a proper compatibility string and simply use it. What
about:
"cdns,the_name_of_the_product_that_first_implemented_this_no_usrio_special_case-gem"?

Bye,
-- 
Nicolas Ferre
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