Re: driver using another driver

[Sascha Hauer <s.hauer-bIcnvbaLZ9MEGnE8C9+IrQ@public.gmane.org>]

Hi Sebastian,

On Wed, Jul 30, 2014 at 02:45:51PM +0000, Priebe, Sebastian wrote:
> Hello,
> 
> I am working on a project with an ARMv6 cpu and I am currently trying
> to port our board file to a device tree.  Our custom hardware has a
> CPLD with is used by multiple driver.  In the past we shared the CPLD
> driver resource (struct resource...) among the drivers platform data
> to be able to access the CPLD registers from all the drivers.  The
> CPLD driver allocated the resource, returned it to our platform code
> and our platform code passed it to the other drivers.
> In other words the CPLD driver is used by the other driver.
> How can I achieve the same with a device tree?

You can use a toplevel device node for your CPLD on which your toplevel driver
matches. Call of_platform_populate() with this toplevel node to create
the child devices. drivers/bus/ contains some examples, like
drivers/bus/imx-weim.c.

Sascha

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