Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1757118AbbLBKBY (ORCPT ); Wed, 2 Dec 2015 05:01:24 -0500 Received: from comal.ext.ti.com ([198.47.26.152]:34611 "EHLO comal.ext.ti.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1756354AbbLBKBV (ORCPT ); Wed, 2 Dec 2015 05:01:21 -0500 Subject: Re: [RFC v02 03/15] dmaengine: core: Introduce new, universal API to request a channel To: Tony Lindgren References: <1448891145-10766-1-git-send-email-peter.ujfalusi@ti.com> <1448891145-10766-4-git-send-email-peter.ujfalusi@ti.com> <20151130155142.GZ2517@atomide.com> <565D56A0.2090204@ti.com> <20151201170031.GT23396@atomide.com> CC: , , , , , , , , , From: Peter Ujfalusi Message-ID: <565EC14A.6020502@ti.com> Date: Wed, 2 Dec 2015 12:00:42 +0200 User-Agent: Mozilla/5.0 (X11; Linux x86_64; rv:38.0) Gecko/20100101 Thunderbird/38.3.0 MIME-Version: 1.0 In-Reply-To: <20151201170031.GT23396@atomide.com> Content-Type: text/plain; charset="windows-1252" Content-Transfer-Encoding: 8bit Sender: linux-kernel-owner@vger.kernel.org List-ID: X-Mailing-List: linux-kernel@vger.kernel.org Content-Length: 1631 Lines: 36 On 12/01/2015 07:00 PM, Tony Lindgren wrote: >> I see. The dm81xx basically am33xx/am43xx? > > Yeah similar to am33xx with different clocks and with a bunch of accelerators. > >> Actually I would prefer to use the dmaengine's event router framework and we >> do have support for the am33xx/am43xx type of crossbar already implemented. >> I'm going to resend the DTS series for am33xx/am43xx to convert them to use >> the new DT bindings along with the dma event router support: >> https://www.mail-archive.com/linux-omap%40vger.kernel.org/msg120828.html > > OK yes a dmaengine event router works too when available. Good to see > them as separate driver instances now :) Are only the dts changes missing > now? > > FYI, when we have separate interconnect driver instances, we don't want to > and cannot tweak registers outside the interconnect instance because of them > being in separate clock and/or power domains :p What does this mean in practice? We can not touch these registers? The DMA crossbar is a separate driver from the eDMA driver. > In any case, it seems there's no harm using pinctrl for evtmux on dm81xx > until the event router is available. It's currently only needed on the > t410 emmc that I'm aware of :) The AM33xx/AM43xx DMA crossbar support is in 4.4 already: 42dbdcc6bf96 dmaengine: ti-dma-crossbar: Add support for crossbar on AM33xx/AM43xx -- P?ter -- To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majordomo@vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/