On Tue, Oct 22, 2013 at 11:19:30AM -0700, Bin Gao wrote:
> On Tue, Oct 22, 2013 at 06:44:06AM +0100, Greg Kroah-Hartman wrote:
> > So, just because userspace is "hard" you want to add stuff to the kernel
> > instead.
> >
> Well, there are other reasons - "hard" is just one of them.
> For instance,
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 h
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
On Tue, Oct 22, 2013 at 06:44:06AM +0100, Greg Kroah-Hartman wrote:
> So, just because userspace is "hard" you want to add stuff to the kernel
> instead.
>
Well, there are other reasons - "hard" is just one of them.
For instance, on some platforms with runtime pm enabled, access to registers
of a
On Tue, Oct 22, 2013 at 06:44:06AM +0100, Greg Kroah-Hartman wrote:
> On Mon, Oct 21, 2013 at 05:03:17PM -0700, Bin Gao wrote:
> > To read/write registers from a device is very important on embedded system,
> > especially SoC systems. Physically there could be different types of devices
> > based o
On Mon, Oct 21, 2013 at 05:03:17PM -0700, Bin Gao wrote:
> To read/write registers from a device is very important on embedded system,
> especially SoC systems. Physically there could be different types of devices
> based on bus tyes, e.g. PCI devices, I2C (slave)devices, I/O devices(memory
> mappe
To read/write registers from a device is very important on embedded system,
especially SoC systems. Physically there could be different types of devices
based on bus tyes, e.g. PCI devices, I2C (slave)devices, I/O devices(memory
mapped), inter-processor devices, etc. Typically there are userland
to
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