linux-kernel - Re: [PATCH v2 13/14] ARM: DTS: am33xx: Use the new DT bindings for the eDMA3

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Date:	Mon, 2 Nov 2015 17:46:05 +0200
From:	Peter Ujfalusi <peter.ujfalusi@...com>
To:	Vinod Koul <vinod.koul@...el.com>, Olof Johansson <olof@...om.net>
CC:	Sekhar Nori <nsekhar@...com>,
	"linux-arm-kernel@...ts.infradead.org" 
	<linux-arm-kernel@...ts.infradead.org>,
	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
	linux-omap <linux-omap@...r.kernel.org>,
	"dmaengine@...r.kernel.org" <dmaengine@...r.kernel.org>,
	"devicetree@...r.kernel.org" <devicetree@...r.kernel.org>,
	Tony Lindgren <tony@...mide.com>,
	Robert Schwebel <r.schwebel@...gutronix.de>,
	"arm@...nel.org" <arm@...nel.org>, "Kristo, Tero" <t-kristo@...com>
Subject: Re: [PATCH v2 13/14] ARM: DTS: am33xx: Use the new DT bindings for
 the eDMA3

Vinod,

On 11/02/2015 05:40 PM, Vinod Koul wrote:
> On Mon, Nov 02, 2015 at 02:13:01PM +0200, Peter Ujfalusi wrote:
>> Vinod,
>>
>> On 11/02/2015 12:04 PM, Vinod Koul wrote:
>>> On Mon, Nov 02, 2015 at 01:21:19AM -0800, Olof Johansson wrote:
>>>> Hi,
>>>>
>>>> 1) This seems to have broken BBB in -next for me, bisected down to this patch.
>>>>
>>>> For bootlog:
>>>> http://arm-soc.lixom.net/bootlogs/next/next-20151102/bbb-arm-omap2plus_defconfig.html
>>>>
>>>> 2) Please avoid merging DT/platform code in your driver tree, Vinod,
>>>> at least without an ack from the platform maintainer. It can be a a
>>>> huge mess if they end up causing conflicts, so we always ask to merge
>>>> the DT changes through the platform maintainer (Tony in this case) by
>>>> default.
>>>
>>> I did warn when applying that I am doing so without ACK on ARM code, noone
>>> said a thing!
>>>
>>> I knew Tony was following the work by Peter so assumed he must have been okay
>>> with it otherwise would have spoken for ~couple of weeks these were in
>>> review
>>>
>>> Anyway now that we have a regression, I can revert this patch if that fixes,
>>> please confirm, but might break edma... peter?
>>
>> Can you revert or drop the last two DTS patches?
>>
>> I think I will try a different route to get the split of the tpcc and tptc.
>> Without the DT patches the driver will fall back to the legacy mode so things
>> will work in a same way they did before.
>> Or I can send a followup patch for edma.c, with that there is no need to add
>> the HWMOD_INIT_NO_IDLE to hwmod and power management looks better.
>> Basically I'm registering a 'dummy' driver for the edma3-tptc so omap hwmod
>> code will not shut it down but we will keep the possibility to manage the
>> power state still.
> 
> Okay I have reverted the two and applied the edma patch sent, can you please
> verify topic/edma_fix before I merge it and send my PULL request.

The branch looks good. Thank you!
It would have been great if the DTS changes for am335x/am437x would have been
in 4.4, but I will send them for 4.5 after rc1 is out.

> Would appreciate any tested-by
> 
> Thanks
> 


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Péter
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