From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: X-Spam-Checker-Version: SpamAssassin 3.4.0 (2014-02-07) on aws-us-west-2-korg-lkml-1.web.codeaurora.org X-Spam-Level: X-Spam-Status: No, score=-5.3 required=3.0 tests=BAYES_00, HEADER_FROM_DIFFERENT_DOMAINS,MAILING_LIST_MULTI,SPF_HELO_NONE,SPF_PASS, USER_AGENT_SANE_1 autolearn=no autolearn_force=no version=3.4.0 Received: from mail.kernel.org (mail.kernel.org [198.145.29.99]) by smtp.lore.kernel.org (Postfix) with ESMTP id 124D5C49361 for ; Mon, 28 Jun 2021 13:50:02 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by mail.kernel.org (Postfix) with ESMTP id E60FF61C75 for ; Mon, 28 Jun 2021 13:50:01 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S232209AbhF1Nw0 (ORCPT ); Mon, 28 Jun 2021 09:52:26 -0400 Received: from verein.lst.de ([213.95.11.211]:36550 "EHLO verein.lst.de" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S231944AbhF1NwX (ORCPT ); Mon, 28 Jun 2021 09:52:23 -0400 Received: by verein.lst.de (Postfix, from userid 2407) id 2695F6736F; Mon, 28 Jun 2021 15:49:56 +0200 (CEST) Date: Mon, 28 Jun 2021 15:49:55 +0200 From: Christoph Hellwig To: Rob Landley Cc: Christoph Hellwig , Yoshinori Sato , Rich Felker , linux-sh@vger.kernel.org, linux-kernel@vger.kernel.org Subject: Re: dma_declare_coherent_memory and SuperH Message-ID: <20210628134955.GA22559@lst.de> References: <20210623133205.GA28589@lst.de> <1a55cf69-8fe1-dca0-68c7-f978567f9ca0@landley.net> <20210628133858.GA21602@lst.de> <4d6b7c35-f2fa-b476-b814-598a812770e6@landley.net> MIME-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Disposition: inline In-Reply-To: <4d6b7c35-f2fa-b476-b814-598a812770e6@landley.net> User-Agent: Mutt/1.5.17 (2007-11-01) Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org On Mon, Jun 28, 2021 at 09:04:19AM -0500, Rob Landley wrote: > > Well, the replacement is to declare the device memory carveouts in the > > Device Tree. > > Your plan is to eliminate the ability for non-device-tree boards to do DMA? No. My hope is to kill dma_declarare_coherent, an API for board support files to declare device-specific regions to be used for coherent DMA.