Re: [SPAM]Re: [PATCH v3 4/5] dt-bindings: clock: mediatek: update audsys documentation to adapt MFD device

[Ryder Lee <ryder.lee@mediatek.com>]

On Mon, 2018-02-19 at 12:29 -0600, Rob Herring wrote:
> On Mon, Feb 12, 2018 at 5:28 AM, Ryder Lee <ryder.lee@mediatek.com> wrote:
> > The MediaTek audio hardware block that exposes functionalities that are
> > handled by separate subsystems in the kernel.  These functions are all
> > mapped somewhere at 0x112xxxxx, and there are some control bits are mixed
> > up with other functions within the same registers.
> 
> I still don't think this change is necessary.
> 
> Just because a hardware block in DT maps to different subsystems in a
> particular OS doesn't mean you need a DT node for each OS subsystem.
> What we have subsystems for changes over time and DT shouldn't really
> be changing based on that. And DT is not the only way to instantiate
> drivers.
> 

Apart right now we have the definition of both functions. The other
location is here:../sonud/mt2701-afe-pcm.txt. The ways I could come up
with are:

1. Add a dummy MFD driver (need to think a new compatible or just use
'*-audsys' which has already been picked by clock driver) to instantiate
two sub-devices through id_table and mfd_cell.

2. For the sake of simplification - add a new compatible "simple-mfd".

3. The last thing - keep two nodes separated/independent. (x)

I'm not sure which one is better.



@Lee @Matthias: What do you suggest?

Ryder.