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

Pierre-Louis Bossart
2019-05-07T22:49:53Z

>> 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?