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

[Bin Gao]

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.
For I2C slave devices, there is no such a issue so yes i2c-tools and i2c-dev drivers
are fine. But the two APIs are required by PCI and memory mapped I/O devices anyway.
--
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/