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=-3.0 required=3.0 tests=HEADER_FROM_DIFFERENT_DOMAINS, MAILING_LIST_MULTI,SPF_PASS,URIBL_BLOCKED,USER_AGENT_NEOMUTT autolearn=ham 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 5293DC4321D for ; Mon, 20 Aug 2018 15:32:22 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [209.132.180.67]) by mail.kernel.org (Postfix) with ESMTP id 158F32172C for ; Mon, 20 Aug 2018 15:32:22 +0000 (UTC) DMARC-Filter: OpenDMARC Filter v1.3.2 mail.kernel.org 158F32172C Authentication-Results: mail.kernel.org; dmarc=none (p=none dis=none) header.from=bootlin.com Authentication-Results: mail.kernel.org; spf=none smtp.mailfrom=linux-kernel-owner@vger.kernel.org Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1727397AbeHTSsZ (ORCPT ); Mon, 20 Aug 2018 14:48:25 -0400 Received: from mail.bootlin.com ([62.4.15.54]:45905 "EHLO mail.bootlin.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1726119AbeHTSsY (ORCPT ); Mon, 20 Aug 2018 14:48:24 -0400 Received: by mail.bootlin.com (Postfix, from userid 110) id 9665820719; Mon, 20 Aug 2018 17:32:16 +0200 (CEST) Received: from localhost (AAubervilliers-681-1-85-9.w90-88.abo.wanadoo.fr [90.88.27.9]) by mail.bootlin.com (Postfix) with ESMTPSA id 6872F204AE; Mon, 20 Aug 2018 17:32:06 +0200 (CEST) Date: Mon, 20 Aug 2018 17:32:07 +0200 From: Maxime Ripard To: Georgi Djakov Cc: Rob Herring , linux-pm@vger.kernel.org, Greg Kroah-Hartman , "Rafael J. Wysocki" , Rob Herring , Mike Turquette , khilman@baylibre.com, Vincent Guittot , skannan@codeaurora.org, Bjorn Andersson , Amit Kucheria , seansw@qti.qualcomm.com, daidavid1@codeaurora.org, evgreen@chromium.org, Mark Rutland , Lorenzo Pieralisi , Alexandre Bailon , Arnd Bergmann , Linux Kernel Mailing List , linux-arm-kernel , linux-arm-msm@vger.kernel.org, devicetree@vger.kernel.org Subject: Re: [PATCH v7 2/8] dt-bindings: Introduce interconnect provider bindings Message-ID: <20180820153207.xx5outviph7ec76p@flea> References: <20180731161340.13000-1-georgi.djakov@linaro.org> <20180731161340.13000-3-georgi.djakov@linaro.org> MIME-Version: 1.0 Content-Type: multipart/signed; micalg=pgp-sha256; protocol="application/pgp-signature"; boundary="nsqsqzl6ecisbpih" Content-Disposition: inline In-Reply-To: User-Agent: NeoMutt/20180716 Sender: linux-kernel-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org --nsqsqzl6ecisbpih Content-Type: text/plain; charset=us-ascii Content-Disposition: inline Content-Transfer-Encoding: quoted-printable Hi Georgi, On Tue, Aug 07, 2018 at 05:54:38PM +0300, Georgi Djakov wrote: > > There is also a patch series from Maxime Ripard that's addressing the > > same general area. See "dt-bindings: Add a dma-parent property". We > > don't need multiple ways to address describing the device to memory > > paths, so you all had better work out a common solution. >=20 > Looks like this fits exactly into the interconnect API concept. I see > MBUS as interconnect provider and display/camera as consumers, that > report their bandwidth needs. I am also planning to add support for > priority. Thanks for working on this. After looking at your serie, the one thing I'm a bit uncertain about (and the most important one to us) is how we would be able to tell through which interconnect the DMA are done. This is important to us since our topology is actually quite simple as you've seen, but the RAM is not mapped on that bus and on the CPU's, so we need to apply an offset to each buffer being DMA'd. Maxime --=20 Maxime Ripard, Bootlin (formerly Free Electrons) Embedded Linux and Kernel engineering https://bootlin.com --nsqsqzl6ecisbpih Content-Type: application/pgp-signature; name="signature.asc" -----BEGIN PGP SIGNATURE----- iQIzBAABCAAdFiEE0VqZU19dR2zEVaqr0rTAlCFNr3QFAlt63vYACgkQ0rTAlCFN r3TtAw//anYGPzaYAXU2DfIhIP1WNOqjhKjLIXnfx3R/tY+yQzvEmnSGYUWRcwGD WHtoOg6GYW1mUWWjyq6RFJeTbeBjLTcz2Lm7rYP/Oq78lCBUHO8jPWj/Ry10NuN/ sM4emc7NyLJ4ZHzqLOIUXb5HEay6rN1pCbDKnTPM4eQf0Fewt2guDzr4lv9iCsYY NL6Xeval9Y/RhEJsaNcgYheMloheJAjmM3zo6CSjItA+PgRaaXI1wGCfLn8ilXty niTfLSVeJfVOVZ+WTfdUjhmWZ8mkt/jMvka39qLCI8njsvxLz/chwDkUAIIvHCmA qxvGhRbbLK6gzlW9ccE98bilvB/BcGEqq5SIZ+Uuu5CoO7vzqYbiXSqM4IUZJRCx VP5C+JXbT0fY6mn9OyvwGCeQ6TTbHPtFHiu7DSEfLg0eK6z9gobOVXWBqUO5o7Iz t9YyiwH2mU8uVRbhma4BjYghLoaE5v8O/QSNeEM6EyNqRYy0LdWJf4xOCt2szbGX xI3LYYe8lryCzfyQ9F+D0Rs7SI99KY7TYXEvl33YlszjWb5b8Qrb/YwnnlOybF84 MvyXb8ru1Ku5ZUdn6VEXGqiR0MH9hFHq4aKyBQZQ/5gtxAHelt3zTvq+FMPjjyBa hdTlTFP/57Sc4s2OOFG/X+kpjrXaoohKoLFvUYMFx9tK9Y61Ook= =4UZ2 -----END PGP SIGNATURE----- --nsqsqzl6ecisbpih--