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=-2.3 required=3.0 tests=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 0F289C43603 for ; Tue, 17 Dec 2019 19:54:14 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [209.132.180.67]) by mail.kernel.org (Postfix) with ESMTP id CD8622176D for ; Tue, 17 Dec 2019 19:54:13 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1727437AbfLQTyJ (ORCPT ); Tue, 17 Dec 2019 14:54:09 -0500 Received: from mga02.intel.com ([134.134.136.20]:22025 "EHLO mga02.intel.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1727492AbfLQTyH (ORCPT ); Tue, 17 Dec 2019 14:54:07 -0500 X-Amp-Result: SKIPPED(no attachment in message) X-Amp-File-Uploaded: False Received: from orsmga005.jf.intel.com ([10.7.209.41]) by orsmga101.jf.intel.com with ESMTP/TLS/DHE-RSA-AES256-GCM-SHA384; 17 Dec 2019 11:54:07 -0800 X-ExtLoop1: 1 X-IronPort-AV: E=Sophos;i="5.69,326,1571727600"; d="scan'208";a="389942477" Received: from vramados-mobl.amr.corp.intel.com (HELO [10.254.1.250]) ([10.254.1.250]) by orsmga005.jf.intel.com with ESMTP; 17 Dec 2019 11:54:05 -0800 Subject: Re: [alsa-devel] [PATCH 00/10] mfd: Add support for Analog Devices A2B transceiver To: Daniel Mack , linux-kernel@vger.kernel.org, linux-gpio@vger.kernel.org, linux-i2c@vger.kernel.org, alsa-devel@alsa-project.org, devicetree@vger.kernel.org, linux-clk@vger.kernel.org Cc: lars@metafoo.de, sboyd@kernel.org, mturquette@baylibre.com, robh+dt@kernel.org, broonie@kernel.org, pascal.huerst@gmail.com, lee.jones@linaro.org References: <20191209183511.3576038-1-daniel@zonque.org> From: Pierre-Louis Bossart Message-ID: Date: Tue, 17 Dec 2019 13:29:20 -0600 User-Agent: Mozilla/5.0 (X11; Linux x86_64; rv:68.0) Gecko/20100101 Thunderbird/68.2.2 MIME-Version: 1.0 In-Reply-To: <20191209183511.3576038-1-daniel@zonque.org> Content-Type: text/plain; charset=utf-8; format=flowed Content-Language: en-US Content-Transfer-Encoding: 7bit Sender: linux-clk-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: linux-clk@vger.kernel.org > Transceivers can both receive and provide audio, and streams can be > routed from one node to any other, including many others. The tricky > bit is how to expose the audio routing in DT in a sane way. > The way it is implemented here, the slave nodes specify the number of > slots they each consume and generate, and which thereof they forward > from one side to the other. This mimics the internal register > structure and should allow for even exotic setups. It was my understanding that the A2B bus is bidirectional but with separate time windows allocated for host->device and device->host transmission. The wording seems to hint at device-to-device communication but I wonder if this is really what you meant.