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

[Pierre-Louis Bossart]

> > 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?