Re: driver using another driver

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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