Re: [[LINUX PATCH v10] 4/4] mtd: rawnand: pl353: Add basic driver for arm pl353 smc nand interface

[Linus Walleij]

On Fri, Jun 29, 2018 at 6:15 AM Naga Sureshkumar Relli
<nagasure@xxxxxxxxxx> wrote:
> > On Thu, Jun 28, 2018 at 2:13 PM Naga Sureshkumar Relli <nagasure@xxxxxxxxxx> wrote:
> >
> >
> > > > This driver has the same problem as the other patches:
> > > > use the ARM_AMBA primecell magic numbers detection, and the PrimeCell bus.
> > >
> > > Here the child is NAND controller and the parent is PL353 SMC, so do
> > > we need to update this also as AMBA driver?
> >
> > No, sorry. The parent is spawning another device and you should indeed use a platform device
> > for that.
> >
> Ok, you mean platform driver model is sufficient for both pl353-smc.c and pl353_nand.c drivers?
> Or AMBA model is for pl353-smc and platform driver model is for pl353-nand?

The latter, AMBA primecell bus for pl353-smc and platform device for the
nand subdevice.

Platform device is for anything that cannot be autodetected with e.g.
magic hardare numbers, and the first device can be autodetected as a
prime cell but not the subdevice.

Yours,
Linus Walleij