Re: [PATCH 0/4] drivers/misc: add rawio framework and drivers

[Greg Kroah-Hartman]

On Tue, Oct 22, 2013 at 11:50:04AM -0700, Bin Gao wrote:
> On Tue, Oct 22, 2013 at 10:14:00AM -0700, Guenter Roeck wrote:
> > > 
> > > You can already do this today for PCI with the UIO framework, right?
> > > Why duplicate that functionality here with another userapce API that we
> > > will then have to maintain for the next 40+ years?
> > > 
> > Same for i2c, where the same functionality is supported through i2c-tools and
> > the i2c-dev driver. Adding i2c-tools to initramfs and/or to the root file system
> > should not be that much of an issue, much less than having to maintain two APIs
> > for the same purpose.
> > 
> > Guenter
> 
> For PCI and memory mapped I/O devices, we have the runtime pm issue that has to
> be addressed from kernel space.

Then create a UIO pci driver and you should be fine, right?  That's what
others do today and it works quite well for them.

greg k-h
--
To unsubscribe from this list: send the line "unsubscribe linux-kernel" in
the body of a message to majordomo@xxxxxxxxxxxxxxx
More majordomo info at  http://vger.kernel.org/majordomo-info.html
Please read the FAQ at  http://www.tux.org/lkml/