linux-kernel - Re: [PATCH v3 4/5] dma: imx-sdma: add an index for imx8mq multi sdma devices

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Date:   Wed, 23 Jan 2019 21:25:17 +0530
From:   Vinod Koul <vkoul@...nel.org>
To:     Angus Ainslie <angus@...ea.ca>
Cc:     Lucas Stach <l.stach@...gutronix.de>, angus.ainslie@...i.sm,
        dmaengine@...r.kernel.org, NXP Linux Team <linux-imx@....com>,
        Pengutronix Kernel Team <kernel@...gutronix.de>,
        linux-arm-kernel@...ts.infradead.org, linux-kernel@...r.kernel.org,
        Daniel Baluta <daniel.baluta@...il.com>
Subject: Re: [PATCH v3 4/5] dma: imx-sdma: add an index for imx8mq multi sdma
 devices

On 23-01-19, 08:42, Angus Ainslie wrote:
> On 2019-01-23 08:31, Lucas Stach wrote:
> > Hi Angus,
> > 
> > Am Mittwoch, den 23.01.2019, 08:23 -0700 schrieb Angus Ainslie (Purism):
> > > On i.mx8mq, there are two sdma instances, and the common dma framework
> > > will get a channel dynamically from any available sdma instance
> > > whether
> > > it's the first sdma device or the second sdma device. Some IPs like
> > > SAI only work with sdma2 not sdma1. To make sure the sdma channel is
> > > from
> > > the correct sdma device, use an index to match.
> > > 
> > > Based on MLK-16104-2 by Robin Gong <yibin.gong@....com>
> > 
> > This relies on the probe order of the devices (which should be treated
> > as random) for the match to find the right device. This is not
> > acceptable upstream.
> > 
> > The DT "dmas" property already specifies the correct SDMA device to use
> >  for a consumer, so the filter function should really match the OF node
> > of the SDMA device with the node specified in the dmas phandle in order
> > to pick the right SDMA engine.
> > 
> 
> Thanks Lucas, I'll fix it for rev 4

And fix the subsystem name, it is 'dmaengine: ...' not 'dma: ...'. git
log of the subsystem should give you good clue of the tags to be used..

Thanks

-- 
~Vinod