Re: [PATCH/RFC 1/4]device core changes

Russell King
2004-11-11T08:44:11Z

On Thu, Nov 11, 2004 at 03:03:33PM +0800, Li Shaohua wrote:
> On Wed, 2004-11-10 at 12:28, Russell King wrote:
> > On Wed, Nov 10, 2004 at 09:45:37AM +0800, Li Shaohua wrote:
> > > On Wed, 2004-11-10 at 09:24, Greg KH wrote:
> > > > Maybe your other patches weren't so bad... If we implement them, can we
> > > > drop the platform notify stuff?
> > > Currently only ARM use 'platform_notify', and we can easily convert it
> > > to use per-bus 'platform_bind'. One concern of per-bus 'platform_bind'
> > > is we will have many '#ifdef ..' if many platforms implement their
> > > per-bus 'platform_bind'.
> >
> > Except none of the merged ARM platforms use platform_notify, and I haven't
> > seen any suggestion in the ARM world of why it would be needed.
> Ok, let me summarize it. we now have two options:
> 1. using 'platform_notify'
> platform_notify only has one parameter 'struct device', we must know the
> exact bus type of a device. We can identify the bus type from its name
> (such as 'pci', 'ide'), but it's quite some ugly. Or we can add a 'type'
> flag in the 'struct bus_type' to indicate the exact bus type which Greg
> doesn't like it. One shortcoming is the method hasn't good flexibility,
> we must add a new type whenever a new bus type is added.

Is there something wrong with doing dev->bus == &pci_bus_type for
example?

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