Re: what's a platform device?

[Russell King <rmk+lkml@arm.linux.org.uk>]

On Mon, Feb 27, 2006 at 04:25:52PM -0600, Kumar Gala wrote:
> >>>This makes sense, but you seem to be talking about hierarchy more  
> >>>the
> >>>functionality.  I agree in your description of hierarchy.
> >>>
> >>>I was looking at it from a functional point of view, maybe more from
> >>>the device view then from the bus.  I need a struct device type that
> >>>contains resources, a name, an id.  I'll do matching based on name.
> >>> From a functional point of view platform does all this.
> >>>
> >>>Based on your description would you say that a platform_device's
> >>>parent device should always be platform_bus? [I'm getting at the  
> >>>fact
> >>>that we allow pdev->dev.parent to be set by the caller of
> >>>platform_device_add].
> >>>
> >>>Hmm, as I think about this further, I think that its more  
> >>>coincidence
> >>>that the functionality for the "kumar" bus is equivalent to that of
> >>>the "platform" bus.
> >>>
> >>
> >>What about a new bus_type that uses all the sematics of the  
> >>platform_bus.
> >>Doing someting like the following which would allow the caller to  
> >>specify
> >>their own bus_type.
> >>
> >>I'm just trying to avoid duplicating alot of code that already  
> >>exists in
> >>base/platform.c
> >
> >I'm ok with this patch, Russell?
> 
> http://marc.theaimsgroup.com/?l=linux-kernel&m=114072367307531&w=2
> 
> Russell, comments?

No particular opinion on this, other than maybe we want to move the
dev.bus/driver.bus initialisation out of these functions and inline
or something like that - just so there's some distinction between
real platform devices and these other types.

-- 
Russell King
 Linux kernel    2.6 ARM Linux   - http://www.arm.linux.org.uk/
 maintainer of:  2.6 Serial core