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 14:13:01 +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 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.

-- 
Péter
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