Re: [PATCH 1/5] soundwire: bus_type: add master_device/driver support

[Vinod Koul <vkoul@kernel.org>]

On 23-03-20, 11:06, Srinivas Kandagatla wrote:
> 
> 
> On 20/03/2020 18:17, Pierre-Louis Bossart wrote:
> > Thanks for the quick review Srinivas,
> > 
> > > This patch in general is missing device tree support for both
> > > matching and uevent so this will not clearly work for Qualcomm
> > > controller unless we do via platform bus, which does not sound
> > > right!
> > 
> > see other email, the platform bus is handled by a platform
> > device/driver. There was no intention to change that, it's by design
> > rather than an omission/error.
> 
> I understand this partly now!
> 
> This can be probably made better/clear by:
> renaming sdw_master_device_add to sdw_master_alloc and do a
> device_initialize() as part of this function in subsequent call to
> sdw_add_bus_master() we can do a device_add(). Doing this way will avoid a
> bit of unnecessary call to device_unregister by the controller driver, tbh
> which is confusing.
> 
> If the intended call sequence for controller is this (by keeping the parent
> bus type intact):
> 
> sdw_master_alloc/sdw_master_device_add()
> sdw_add_bus_master()

why not have single bus api which does all this :)

> Then we should also remove sdw_unregister_master_driver() and
> module_sdw_master_driver() all together. Having them makes the reader think
> that they can use module_sdw_master_driver directly without any parent bus
> like platform bus in this case.

Precisely, this is one of the reasons for not liking the
sdw_master_driver! It doesnt get used by anyone except Intel.

-- 
~Vinod