Re: [PATCH v2 2/3] arm64: dts: rockchip: Fix vdec register blocks order on RK3576

[Krzysztof Kozlowski <krzk@kernel.org>]

On Mon, Feb 23, 2026 at 09:49:50PM +0200, Cristian Ciocaltea wrote:
> When building device trees for the RK3576 based boards, DTC shows the
> following complaint:
> 
>   rk3576.dtsi:1282.30-1304.5: Warning (simple_bus_reg): /soc/video-codec@27b00000: simple-bus unit address format error, expected "27b00100"

So you need to fix the unit address. This is what the warning tells you.

> 
> Provide the register blocks in the expected address-based order.
> 
> Fixes: da0de806d8b4 ("arm64: dts: rockchip: Add the vdpu383 Video Decoder on rk3576")
> Signed-off-by: Cristian Ciocaltea <cristian.ciocaltea@collabora.com>
> ---
>  arch/arm64/boot/dts/rockchip/rk3576.dtsi | 6 +++---
>  1 file changed, 3 insertions(+), 3 deletions(-)
> 
> diff --git a/arch/arm64/boot/dts/rockchip/rk3576.dtsi b/arch/arm64/boot/dts/rockchip/rk3576.dtsi
> index 49ccdf12ef7e..45eb0d053a6f 100644
> --- a/arch/arm64/boot/dts/rockchip/rk3576.dtsi
> +++ b/arch/arm64/boot/dts/rockchip/rk3576.dtsi
> @@ -1281,10 +1281,10 @@ gpu: gpu@27800000 {
>  
>  		vdec: video-codec@27b00000 {
>  			compatible = "rockchip,rk3576-vdec";
> -			reg = <0x0 0x27b00100 0x0 0x500>,
> -			      <0x0 0x27b00000 0x0 0x100>,
> +			reg = <0x0 0x27b00000 0x0 0x100>,
> +			      <0x0 0x27b00100 0x0 0x500>,
>  			      <0x0 0x27b00600 0x0 0x100>;

The main block, so probably the lowest address as in unit address,
should be used, but this ship has sailed. You shipped this DTS, because
the order of items is FIXED. Your binding change is clearly incorrect
and ABI break without explanation and without reason, so you cannot use
such as an argument here.

You cannot change it without impact, so just fix the unit address.

Best regards,
Krzysztof