linux-kernel - Re: [PATCH RESEND] Documentation: devicetree: Fix Xilinx VDMA specification

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Date:	Wed, 12 Nov 2014 19:03:32 +0100
From:	Andreas Färber <afaerber@...e.de>
To:	Sören Brinkmann <soren.brinkmann@...inx.com>
CC:	Vinod Koul <vinod.koul@...el.com>, dmaengine@...r.kernel.org,
	Michal Simek <michal.simek@...inx.com>,
	linux-arm-kernel@...ts.infradead.org,
	Rob Herring <robh+dt@...nel.org>,
	Pawel Moll <pawel.moll@....com>,
	Mark Rutland <mark.rutland@....com>,
	Ian Campbell <ijc+devicetree@...lion.org.uk>,
	Kumar Gala <galak@...eaurora.org>,
	"OPEN FIRMWARE AND..." <devicetree@...r.kernel.org>,
	LKML <linux-kernel@...r.kernel.org>,
	Srikanth Thokala <sthokal@...inx.com>,
	Lars-Peter Clausen <lars@...afoo.de>
Subject: Re: [PATCH RESEND] Documentation: devicetree: Fix Xilinx VDMA specification

Am 12.11.2014 um 16:57 schrieb Sören Brinkmann:
> On Wed, 2014-11-12 at 02:51PM +0100, Andreas Färber wrote:
>> The specification requires xlnx,data-width, but example and driver use
>> xlnx,datawidth. Change the specification to match the implementation.
> 
> Isn't this the wrong way around? The bindings are considered API, so
> shouldn't the driver be fixed to match the spec?

In theory, patch review should've never let the two differ... ;)

It's not my driver, so I fixed the perceived inconsistency the least
invasive way; Michal and Srikanth seemed to concur at the time.

https://patchwork.kernel.org/patch/4620261/

> Are there already dts files out there using either of these options?

In upstream, no. microblaze and virtex440 use a
xlnx,include-datawidth-matching-0 property as precedence for the
spelling, whereas there is an fsl,data-width and an unused msix-data-width.

Downstream, yes: Beyond my own patch derived from the Parallella tree,
there's some in the ADI tree. None in the Xilinx tree on quick check.

I haven't encountered any using the documented xlnx,data-width - but
this patch was authored pre 3.17, haven't ran a full Web search again.

Regards,
Andreas

-- 
SUSE LINUX GmbH, Maxfeldstr. 5, 90409 Nürnberg, Germany
GF: Jeff Hawn, Jennifer Guild, Felix Imendörffer; HRB 21284 AG Nürnberg

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