On Fri, Jan 17, 2014 at 8:58 AM, Nicolas Pitre [off-list ref] wrote:

On Fri, 17 Jan 2014, Rob Herring wrote:

quoted

On Thu, Jan 16, 2014 at 9:08 PM, Nicolas Pitre [off-list ref] wrote:

quoted

On Thu, 16 Jan 2014, Olof Johansson wrote:

quoted

"for SDIO slots" is somewhat misleading; nearly all controllers only
do one slot/device per controller. The designware controller can do
multiple slots, and that adds a bit of driver and binding complexity
for something that seemingly not a single vendor has actually
implemented.

The Marvell 8688, just to name one, does both WIFI and BlueTooth over
the same SDIO controller using separate functions/slots.

But that is logical functions within a chip, not multiple discrete
chips (i.e. slots) with their own reset, regulators, etc.

OK.  If that's the definition of a slot in this context then I agree.

Correct -- the device that I've been doing the work in is actually the
combined wifi/bluetooth module on the Samsung Chromebook, which is a
Marvell 8797. It has multiple functions which still work well.

The "multi-slot" concept I was talking about was one host controller
for several physical slots. Seems like at91 implements _and_ uses this
but nobody else. However, it seems that they allocate one mmc host per
slot, so the same model still works.


-Olof