[RFC PATCH 1/3] ARM: Introduce ARM_SINGLE_ARMV7R for ARMv7-R platforms

[Arnd Bergmann]

On Fri, Jul 1, 2022 at 11:22 AM Vladimir Murzin <vladimir.murzin at arm.com> wrote:
> On 6/30/22 10:22, Arnd Bergmann wrote:
> > On Thu, Jun 30, 2022 at 10:36 AM Vladimir Murzin
> >         ...
> >
> > That can of course be done independently from your series, but
> > it looks like ARM_SINGLE_ARMV7M and ARM_SINGLE_ARMV7R
> > are mostly the same here, except for the ARM_NVIC selects that
> > could be done by the platforms, and the CPU_V7/CPU_V7M
> > difference that could be folded into the CPU selection menu.
> >
>
> That sounds interesting! Moving NVIC into platforms looks straightforward,
> yet CPU selection would require some surgery:
>  - CPU_V7/CPU_V7M are not user selectable at the moment
>  - We still need some hint from the platform if it supports more
>    than one CPU variant, no?

Right, the two options still need to be visible somewhere. An obvious
place for this would be the CPU architecture select that currently
depends on ARCH_MULTIPLATFORM and contains the choice
between V4/v4TV5/V6/V6K/V7 but could be extended to cover
V7M and V7R, as well as possibly being extended to V7VE and
V8. I would also consider turning this into a 'choice' list where you
only pick the minimum CPU type, so e.g. enabling V6K lets you
pick V6K/V7/V7VE/V8 based machines but not
V4/V4T/V5/V6/V7M/V7R.

       Arnd