[PATCH/RFC] Runtime PM: ARM: subarch-specific extensions of pdev_archdata
Kevin Hilman
khilman at deeprootsystems.com
Wed Sep 23 19:28:29 EDT 2009
Mikael Pettersson wrote:
> Eric Miao writes:
> > On Wed, Sep 23, 2009 at 9:50 AM, Kevin Hilman
> > <khilman at deeprootsystems.com> wrote:
> > > On ARM platforms, power management can be very platform specific.
> > > This patch allows ARM subarches to extend the platform_device
> > > pdev_archdata for each subarch by creating a new struct pdev_machdata
> > > and allowing each subarch to customize it as needed.
> > >
> > > As a starting point, each subarch's <mach/device.h> creates an empty
> > > struct pdev_machdata.
> > >
> >
> > Shouldn't that pdev_archdata and pdev_machdata be pointer or something
> > so that multiple platform_device can share something in common?
>
> Forcing it to be a pointer has allocation and lifetime implications.
> Making it a struct allows the subarch to duplicate or share
> (via a private pointer) data as it sees fit.
Yes, the allocation/lifetime issues were why a struct was chosen.
Kevin
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