Messages in this thread | | | Date | Tue, 22 Oct 2013 11:50:04 -0700 | From | Bin Gao <> | Subject | Re: [PATCH 0/4] drivers/misc: add rawio framework and drivers |
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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.
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