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

On Tue, Aug 04, 2026 at 09:48:19AM +0200, Krzysztof Kozlowski wrote:
> 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.
Ok understood. Will drop the fallback and make it either
	compatible = "raspberrypi,5-model-b-d0", "brcm,bcm2712";
or
	compatible = "raspberrypi,5-model-b", "brcm,bcm2712";
> 
> Best regards,
> Krzysztof
> 
Best regards,
-- 
Gregor Herburger
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