Re: [PATCH v10 0/9] Add the I3C subsystem

Boris Brezillon
2018-11-15T19:07:43Z

On Thu, 15 Nov 2018 15:25:11 +0000
vitor <vitor.soares@synopsys.com> wrote:

> Hi Arnd,
>
> On 15/11/18 14:25, Arnd Bergmann wrote:
> > I agree about better not exposing the bus as a /dev/i3c* node, and that we
> > probably do need to expose individual devices in some form to allow
> > writing complete user space drivers that can do everything a kernel driver
> > can do.
> >
> > Can you describe what a low-level interface to the device looks like
> > in the kernel? Can this be abstracted as simply pread()/pwrite() plus
> > an interrupt mechanism, or do we need a set of ioctl() operations as
> > well?
>
> Like in i2c is likely to need the ioctl() too.

Yep, I think we'll need an ioctl given the various type of transfers
one case use to interact with a device.