From mboxrd@z Thu Jan 1 00:00:00 1970 From: Peter Ujfalusi Subject: Re: [PATCH] ARM: DTS: am33xx: Use the new DT bindings for the eDMA3 Date: Tue, 8 Dec 2015 12:22:09 +0200 Message-ID: <5666AF51.9080306@ti.com> References: <1449225915-28879-1-git-send-email-peter.ujfalusi@ti.com> <20151204215115.GP23396@atomide.com> <566689E2.7060907@ti.com> <4387766.cHF7OBX0cm@wuerfel> Mime-Version: 1.0 Content-Type: text/plain; charset=windows-1252 Content-Transfer-Encoding: QUOTED-PRINTABLE Return-path: In-Reply-To: <4387766.cHF7OBX0cm@wuerfel> Sender: devicetree-owner-u79uwXL29TY76Z2rM5mHXA@public.gmane.org To: Arnd Bergmann , linux-arm-kernel-IAPFreCvJWM7uuMidbF8XUB+6BGkLq7r@public.gmane.org Cc: Tony Lindgren , Vinod Koul , devicetree-u79uwXL29TY76Z2rM5mHXA@public.gmane.org, linux-omap-u79uwXL29TY76Z2rM5mHXA@public.gmane.org, Felipe Balbi List-Id: devicetree@vger.kernel.org On 12/08/2015 11:51 AM, Arnd Bergmann wrote: > On Tuesday 08 December 2015 09:42:26 Peter Ujfalusi wrote: >> On 12/04/2015 11:51 PM, Tony Lindgren wrote: >>>> >>>> Please just drop the /bits/ 16 and use normal cells. >>> >>> Yeah agreed, makes things less confusing for sure=20 >> >> 4.4 will be the first kernel where we will have the new eDMA binding= s. I have >> chosen to use 16bit array for specifying the channels used for memcp= y >> (ti,edma-memcpy-channels) and for the reserving paRAM slots >> (ti,edma-reserved-slot-ranges). As of now we have maximum of 64 chan= nels and >> 512 paRAM slots. 16bit is more than enough to store this information= and it >> even gives us enough room if ever in the future these numbers are go= ing to >> increase (which they are not). >> >> But in order to change them to 32bit the driver needs to be changed = as well. >> Currently we do not have drivers (in 4.4) using the new bindings, 4.= 4 is not >> yet out, so it might be possible to change the binding document and = the driver >> to use 32bit arrays. The driver internally uses 16bit type for these= which I'm >> not going to change, but the code parsing the DT needs to be adjuste= d for the >> new data type. >> >> If Vinod is willing to take update for the DT binding of eDMA for 4.= 4-rc, I >> can cook up the patch(es) to do so. >=20 > I hadn't realized that it was already in 4.4-rc. The change should be= trivial > enough though, so I'd still do it. If Vinod would rather not change i= t now, > it's not overly important though. But this change must be done before we have actual users of these prope= rties, which is the am33xx, am437x and the da850 conversion series I have sent= recently. We might want to have this changed for 4.4 since it is going to be an L= TS release... --=20 P=E9ter -- To unsubscribe from this list: send the line "unsubscribe devicetree" i= n the body of a message to majordomo-u79uwXL29TY76Z2rM5mHXA@public.gmane.org More majordomo info at http://vger.kernel.org/majordomo-info.html