linux-kernel - Re: [PATCH 09/19] powerpc: boot: Build devicetrees when CONFIG

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Message-ID: <6443434a-f810-4591-b1e4-cfea0bc0b993@csgroup.eu>
Date: Mon, 6 Jan 2025 14:55:22 +0100
From: Christophe Leroy <christophe.leroy@...roup.eu>
To: j.ne@...teo.net, Michael Ellerman <mpe@...erman.id.au>,
 Nicholas Piggin <npiggin@...il.com>, Naveen N Rao <naveen@...nel.org>,
 Madhavan Srinivasan <maddy@...ux.ibm.com>, Rob Herring <robh@...nel.org>,
 Krzysztof Kozlowski <krzk+dt@...nel.org>, Conor Dooley
 <conor+dt@...nel.org>, Linus Walleij <linus.walleij@...aro.org>,
 Bartosz Golaszewski <brgl@...ev.pl>, Frank Li <Frank.Li@....com>
Cc: linuxppc-dev@...ts.ozlabs.org, linux-kernel@...r.kernel.org,
 devicetree@...r.kernel.org, linux-gpio@...r.kernel.org
Subject: Re: [PATCH 09/19] powerpc: boot: Build devicetrees when
 CONFIG_MPC831x=y



Le 02/01/2025 à 19:31, J. Neuschäfer via B4 Relay a écrit :
> [Vous ne recevez pas souvent de courriers de devnull+j.ne.posteo.net@...nel.org. Découvrez pourquoi ceci est important à https://aka.ms/LearnAboutSenderIdentification ]
> 
> From: "J. Neuschäfer" <j.ne@...teo.net>
> 
> In order to produce useful FIT images, the kernel needs to know which
> devicetrees to build. To that end, follow the same approach as other
> architectures, and enable devicetrees per platform.

Why do you need that ? Why not just use CONFIG_EXTRA_TARGETS for that ?

> 
> Signed-off-by: J. Neuschäfer <j.ne@...teo.net>
> ---
> 
> I've only enabled MPC831x devicetrees, because that's the hardware I have.
> ---
>   arch/powerpc/boot/dts/Makefile | 5 +++++
>   1 file changed, 5 insertions(+)
> 
> diff --git a/arch/powerpc/boot/dts/Makefile b/arch/powerpc/boot/dts/Makefile
> index 0cd0d8558b475cfe342f36f4b78240ef88dd2e37..6aee895d5baaa2c978d4b1c82a6d198d9e166ea2 100644
> --- a/arch/powerpc/boot/dts/Makefile
> +++ b/arch/powerpc/boot/dts/Makefile
> @@ -3,3 +3,8 @@
>   subdir-y += fsl
> 
>   dtb-$(CONFIG_OF_ALL_DTBS) := $(patsubst $(src)/%.dts,%.dtb, $(wildcard $(src)/*.dts))
> +
> +dtb-$(CONFIG_MPC831x) += \
> +       kmeter1.dtb \
> +       mpc8313erdb.dtb \
> +       mpc8315erdb.dtb

How will it know which one of the three to put in the FIT image ? Or do 
you want all three in the FIT image ? In that case how do you select 
which one to use at boot ?

> 
> --
> 2.45.2
> 
>