[PATCH v4 1/5] drivers: memory: Introduce Marvell EBU Device Bus driver

[Arnd Bergmann]

On Tuesday 09 April 2013, Ezequiel Garcia wrote:
> > This can probably just be of_platform_populate or similar to do all
> > children? For instance, I often use many DT nodes to represent a FPGA,
> > since the my FPGA's tend to have many functionally orthogonal units
> > inside.
> > 
> 
> In the past I've found it's not possible to use of_platform_populate,
> altough I can be wrong.
> 
> The problem seems to be that through of_platform_populate() it's
> possible that the child device (cfi-flash, for instance) gets probed
> before the devbus controller. In other words, the actual parent-child
> relationship gets lost and it's necesarry to use some child probe deferal
> mechanism.
> 
> This has been recently discussed [1] when implementing GPMC where for simplicity
> the of_platform_device_create() solution was chosen.
> Anyway, I'll try of_platform_populate early tomorrow.

I think the problem mentioned in that thread was that the device would
automatically get probed by the top-level of_platform_populate() when
you mark the devbus as compatible="simple-bus", which is not what Jason
was referring to. Instead you should call of_platform_populate in the
probe() function of the devbus device to probe its children after
the bus is set up.

	Arnd