linux-kernel - Re: [alsa-devel] [PATCH 00/10] mfd: Add support for Analog Devices A2B transceiver

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Date:   Tue, 17 Dec 2019 13:29:20 -0600
From:   Pierre-Louis Bossart <pierre-louis.bossart@...ux.intel.com>
To:     Daniel Mack <daniel@...que.org>, linux-kernel@...r.kernel.org,
        linux-gpio@...r.kernel.org, linux-i2c@...r.kernel.org,
        alsa-devel@...a-project.org, devicetree@...r.kernel.org,
        linux-clk@...r.kernel.org
Cc:     lars@...afoo.de, sboyd@...nel.org, mturquette@...libre.com,
        robh+dt@...nel.org, broonie@...nel.org, pascal.huerst@...il.com,
        lee.jones@...aro.org
Subject: Re: [alsa-devel] [PATCH 00/10] mfd: Add support for Analog Devices
 A2B transceiver


> 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.