linux-kernel - Re: [PATCH v2] video: simplefb: add mode parsing function

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Message-ID: <CAAVeFuLYe6xuzV4Y_r8GXoPWd8n3fn=jyp06hRTJVE-t1pf9eg@mail.gmail.com>
Date:	Tue, 28 May 2013 13:57:51 +0900
From:	Alexandre Courbot <gnurou@...il.com>
To:	Stephen Warren <swarren@...dotorg.org>
Cc:	Alexandre Courbot <acourbot@...dia.com>,
	Andrew Morton <akpm@...ux-foundation.org>,
	Arnd Bergmann <arnd@...db.de>, Olof Johansson <olof@...om.net>,
	Rob Clark <robclark@...il.com>,
	"linux-fbdev@...r.kernel.org" <linux-fbdev@...r.kernel.org>,
	"devicetree-discuss@...ts.ozlabs.org" 
	<devicetree-discuss@...ts.ozlabs.org>,
	"linux-arm-kernel@...ts.infradead.org" 
	<linux-arm-kernel@...ts.infradead.org>,
	linux-rpi-kernel@...ts.infradead.org,
	Linux Kernel Mailing List <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH v2] video: simplefb: add mode parsing function

On Tue, May 28, 2013 at 1:13 PM, Stephen Warren <swarren@...dotorg.org> wrote:
> On 05/26/2013 09:53 PM, Alexandre Courbot wrote:
>> The naming scheme of simplefb's mode is precise enough to allow building
>> the mode structure from it instead of using a static list of modes. This
>> patch introduces a function that does this. In case exotic modes that
>> cannot be represented from their name alone are needed, the static list
>> of modes is still available as a backup.
>>
>> It also changes the order in which colors are declared from MSB first to
>> the more standard LSB first.
>>
>> Signed-off-by: Alexandre Courbot <acourbot@...dia.com>
>> ---
>> Changes from v1:
>> - amended documentation following Stephen's suggestion
>> - allow parsing of bitfields larger than 9 bits
>> - made it clear that the parsing order of bits is changed with respect
>>   to the original patch
>>
>> Andrew, since this patch introduces a (small) change in the DT bindings,
>> could we try to merge it during the -rc cycle so we don't have to come
>> with a more complex solution in the future?
>
> So, I think we shouldn't change the DT binding at all now. The original
> driver is now merged for 3.10, and I think it's far too late to take
> code that implements new features for 3.10. This means that we couldn't
> merge this patch until 3.11. However, by then, we shouldn't be changing
> the DT binding in incompatible ways. Olof has already published some
> U-Boot binaries that use the current binding, and on IRC indicated he'd
> prefer not to change the binding because of that.
>
> As such, we should either:
>
> a) Just add new entries into the format array that already exists in the
> driver. Given David's response, this might be simplest.
>
> b) Extend the DT binding in a 100% backwards-compatible way, which would
> mean defaulting the bit-order to match the existing 1 format, and adding
> a new Boolean property to indicate that the format string is specified
> in the other order.

a) is definitely simpler, so let's do that and drop this patch. Sorry
about the noise.

Alex.
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