linux-kernel - Re: [PATCH v1 3/4] powerpc/machdep: Define 'compatibles' property in ppc

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Date:   Thu, 7 Dec 2023 14:15:16 -0600
From:   Rob Herring <robh@...nel.org>
To:     Christophe Leroy <christophe.leroy@...roup.eu>
Cc:     Michael Ellerman <mpe@...erman.id.au>,
        Nicholas Piggin <npiggin@...il.com>,
        Frank Rowand <frowand.list@...il.com>,
        linux-kernel@...r.kernel.org, linuxppc-dev@...ts.ozlabs.org,
        devicetree@...r.kernel.org
Subject: Re: [PATCH v1 3/4] powerpc/machdep: Define 'compatibles' property in
 ppc_md and use it

On Wed, Dec 06, 2023 at 05:13:34PM +0100, Christophe Leroy wrote:
> Most probe functions that do not use the 'compatible' string do
> nothing else than checking whether the machine is compatible with
> one of the strings in a NULL terminated table of strings.
> 
> Define that table of strings in ppc_md structure and check it directly
> from probe_machine() instead of using ppc_md.probe() for that.
> 
> Keep checking in ppc_md.probe() only for more complex probing.
> 
> All .compatible could be replaced with a single element NULL
> terminated list but that's not worth the churn. Can be do incrementaly
> in follow-up patches.
> 
> Signed-off-by: Christophe Leroy <christophe.leroy@...roup.eu>
> ---
>  arch/powerpc/include/asm/machdep.h            |  1 +
>  arch/powerpc/kernel/setup-common.c            |  2 ++
>  arch/powerpc/platforms/40x/ppc40x_simple.c    |  9 +++------
>  arch/powerpc/platforms/512x/mpc512x_generic.c |  4 +---
>  arch/powerpc/platforms/52xx/lite5200.c        | 10 +---------
>  arch/powerpc/platforms/52xx/mpc5200_simple.c  | 10 +---------
>  arch/powerpc/platforms/83xx/mpc830x_rdb.c     | 10 +---------
>  arch/powerpc/platforms/83xx/mpc831x_rdb.c     | 10 +---------
>  arch/powerpc/platforms/83xx/mpc837x_rdb.c     | 10 +---------
>  arch/powerpc/platforms/85xx/corenet_generic.c |  2 +-
>  arch/powerpc/platforms/85xx/tqm85xx.c         | 10 +---------
>  11 files changed, 14 insertions(+), 64 deletions(-)

> -/*
> - * Called very early, MMU is off, device-tree isn't unflattened
> - */

Certainly an out of date comment as the unflattened API was being 
called.

Reviewed-by: Rob Herring <robh@...nel.org>