Alan Cox wrote:
On Wed, 24 Oct 2007 18:20:52 -0700
David Brownell <[email protected]> wrote:
Add a new resource_len() function, so drivers can start using this
instead of driver-private code for a common idiom. The call can be
useful with at least:
- request_region(), release_region()
- request_mem_region(), release_mem_region()
- ioremap()
Candidate drivers include those using platform or PNP busses, and
maybe some others. PCI already has a similar function.
This patch also updates a representative set of drivers in two
subsystems to use this call (SPI, and USB peripheral/gadget).
PCI also increasingly is using functions that allow the user to choose to
map a resource as a resource (eg pci_iomap). So is it better to have
functions request_mem_resource(res) free_mem_resource(res) and similar
instead or as well ?
With regards to resource reservation... IMO we should mimic struct
pci_dev and add struct resource[] to struct device.
Just like we have pci_request_regions(), we should also be able to
easily to a dev_request_regions(). the implementation should be very
close to pci_request_region() and pci_release_region().
Then a dev_iomap() analogue to pci_iomap() should be pretty
straightforward to create.
Jeff
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