Re: [PATCH v2 2/2] arm64: dts: broadcom: bcm2712-d-rpi-5-b: add compatible

On Mon, Aug 03, 2026 at 02:09:25PM +0200, Gregor Herburger wrote:
> The bcm2712 found on the Raspberry Pi 5 is available in the d Stepping
> and in a c Stepping. There are two separate dts files. The
> bcm2712-rpi-5-b.dts for the c Stepping and the bcm2712-d-rpi-5-b.dts for
> the d Stepping. The d stepping does not set its own compatible/model
> string but uses "raspberrypi,5-model-b".
> 
> These two steppings are not compatible. Booting with the wrong dtb file

Not compatible but...

> causes a crash at boot.
> 
> Add a compatibles string "raspberrypi,5-model-b-d0" to allow us to
> distinguish between those two steppings.
> 
> Signed-off-by: Gregor Herburger <[email protected]>
> ---
>  arch/arm64/boot/dts/broadcom/bcm2712-d-rpi-5-b.dts | 5 +++++
>  1 file changed, 5 insertions(+)
> 
> diff --git a/arch/arm64/boot/dts/broadcom/bcm2712-d-rpi-5-b.dts b/arch/arm64/boot/dts/broadcom/bcm2712-d-rpi-5-b.dts
> index 127be0fc27c2..11a38cd53401 100644
> --- a/arch/arm64/boot/dts/broadcom/bcm2712-d-rpi-5-b.dts
> +++ b/arch/arm64/boot/dts/broadcom/bcm2712-d-rpi-5-b.dts
> @@ -3,6 +3,11 @@
>  
>  #include "bcm2712-rpi-5-b.dts"
>  
> +/ {
> +	compatible = "raspberrypi,5-model-b-d0", "raspberrypi,5-model-b", "brcm,bcm2712";

this tells they are compatible. If compatibility was wrong since the
beginning, you do not have to preserve the ABI.

Best regards,
Krzysztof