linux-kernel - Re: [PATCH 3/3] soundwire: bus_type: add sdw_master

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Date:   Mon, 11 May 2020 14:00:11 -0500
From:   Pierre-Louis Bossart <pierre-louis.bossart@...ux.intel.com>
To:     Vinod Koul <vkoul@...nel.org>,
        Bard Liao <yung-chuan.liao@...ux.intel.com>
Cc:     alsa-devel@...a-project.org, tiwai@...e.de,
        gregkh@...uxfoundation.org, linux-kernel@...r.kernel.org,
        ranjani.sridharan@...ux.intel.com, hui.wang@...onical.com,
        broonie@...nel.org, srinivas.kandagatla@...aro.org,
        jank@...ence.com, mengdong.lin@...el.com,
        slawomir.blauciak@...el.com, sanyog.r.kale@...el.com,
        rander.wang@...ux.intel.com, bard.liao@...el.com
Subject: Re: [PATCH 3/3] soundwire: bus_type: add sdw_master_device support




>> +	md = &bus->md;
>> +	md->dev.bus = &sdw_bus_type;
>> +	md->dev.type = &sdw_master_type;
>> +	md->dev.parent = parent;
>> +	md->dev.of_node = parent->of_node;
>> +	md->dev.fwnode = fwnode;
>> +	md->dev.dma_mask = parent->dma_mask;
>> +
>> +	dev_set_name(&md->dev, "sdw-master-%d", bus->link_id);
> 
> This give nice sdw-master-0. In DT this comes from reg property. I dont
> seem to recall if the ACPI/Disco spec treats link_id as unique across
> the system, can you check that please, if not we would need to update
> this.
Table 3 in the Disco for Soundwire 1.0 spec: "all LinkID values are 
relative to the immediate parent Device."

There isn't any known implementation with more than one controller.