linux-kernel - Re: [alsa-devel] [RFC PATCH 1/7] soundwire: Add sysfs support for master(s)

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Date:   Tue, 7 May 2019 17:49:48 -0500
From:   Pierre-Louis Bossart <pierre-louis.bossart@...ux.intel.com>
To:     Greg KH <gregkh@...uxfoundation.org>, Vinod Koul <vkoul@...nel.org>
Cc:     alsa-devel@...a-project.org, tiwai@...e.de,
        linux-kernel@...r.kernel.org, liam.r.girdwood@...ux.intel.com,
        broonie@...nel.org, srinivas.kandagatla@...aro.org,
        jank@...ence.com, joe@...ches.com,
        Sanyog Kale <sanyog.r.kale@...el.com>
Subject: Re: [alsa-devel] [RFC PATCH 1/7] soundwire: Add sysfs support for
 master(s)


>> The model here is that Master device is PCI or Platform device and then
>> creates a bus instance which has soundwire slave devices.
>>
>> So for any attribute on Master device (which has properties as well and
>> representation in sysfs), device specfic struct (PCI/platfrom doesn't
>> help). For slave that is not a problem as sdw_slave structure takes care
>> if that.
>>
>> So, the solution was to create the psedo sdw_master device for the
>> representation and have device-specific structure.
> 
> Ok, much like the "USB host controller" type device.  That's fine, make
> such a device, add it to your bus, and set the type correctly.  And keep
> a pointer to that structure in your device-specific structure if you
> really need to get to anything in it.

humm, you lost me on the last sentence. Did you mean using 
set_drv/platform_data during the init and retrieving the bus information 
with get_drv/platform_data as needed later? Or something else I badly 
need to learn?