[PATCH] ARM: dts: bcm4709: fix bus range assignment

[PATCH] ARM: dts: bcm4709: fix bus range assignment

[Arnd Bergmann]

From: Arnd Bergmann <arnd@arndb.de>

The netgear r8000 dts file limits the bus range for the first host
bridge to exclude bus 0, but the two devices on the first bus are
explicitly assigned to bus 0, causing a build time warning:

/home/arnd/arm-soc/arch/arm/boot/dts/broadcom/bcm4709-netgear-r8000.dts:142.3-27: Warning (pci_device_bus_num): /axi@18000000/pcie@13000/pcie@0/pcie@0,0/pcie@1,0:bus-range: PCI bus number 0 out of range, expected (1 - 255)
/home/arnd/arm-soc/arch/arm/boot/dts/broadcom/bcm4709-netgear-r8000.dts:142.3-27: Warning (pci_device_bus_num): /axi@18000000/pcie@13000/pcie@0/pcie@0,0/pcie@2,0:bus-range: PCI bus number 0 out of range, expected (1 - 255)

I could not find any reason why this is done in the first place, but
this can be easily addressed by reassigning the two devices to
bus 1, or by dropping the bus-range property in order to allow
secondary bus 0 to be assigned.

Assuming the bus-range is intentional, fix this by moving the
devices to the first valid secondary bus number.

Fixes: 893faf67438c ("ARM: dts: BCM5301X: add root pcie bridges")
Signed-off-by: Arnd Bergmann <arnd@arndb.de>
---
 arch/arm/boot/dts/broadcom/bcm4709-netgear-r8000.dts | 4 ++--
 1 file changed, 2 insertions(+), 2 deletions(-)

diff --git a/arch/arm/boot/dts/broadcom/bcm4709-netgear-r8000.dts b/arch/arm/boot/dts/broadcom/bcm4709-netgear-r8000.dts
index d170c71cbd76..355be5014943 100644
--- a/arch/arm/boot/dts/broadcom/bcm4709-netgear-r8000.dts
+++ b/arch/arm/boot/dts/broadcom/bcm4709-netgear-r8000.dts
@@ -147,7 +147,7 @@ pcie@0,0 {
 
 		pcie@1,0 {
 			device_type = "pci";
-			reg = <0x800 0 0 0 0>;
+			reg = <0x10800 0 0 0 0>;
 
 			#address-cells = <3>;
 			#size-cells = <2>;
@@ -162,7 +162,7 @@ wifi@0,0 {
 
 		pcie@2,0 {
 			device_type = "pci";
-			reg = <0x1000 0 0 0 0>;
+			reg = <0x11000 0 0 0 0>;
 
 			#address-cells = <3>;
 			#size-cells = <2>;
-- 
2.39.5

Re: [PATCH] ARM: dts: bcm4709: fix bus range assignment

[Rosen Penev]

On Mon, Apr 13, 2026 at 2:21 AM Arnd Bergmann <arnd@kernel.org> wrote:
>
> From: Arnd Bergmann <arnd@arndb.de>
>
> The netgear r8000 dts file limits the bus range for the first host
> bridge to exclude bus 0, but the two devices on the first bus are
> explicitly assigned to bus 0, causing a build time warning:
>
> /home/arnd/arm-soc/arch/arm/boot/dts/broadcom/bcm4709-netgear-r8000.dts:142.3-27: Warning (pci_device_bus_num): /axi@18000000/pcie@13000/pcie@0/pcie@0,0/pcie@1,0:bus-range: PCI bus number 0 out of range, expected (1 - 255)
> /home/arnd/arm-soc/arch/arm/boot/dts/broadcom/bcm4709-netgear-r8000.dts:142.3-27: Warning (pci_device_bus_num): /axi@18000000/pcie@13000/pcie@0/pcie@0,0/pcie@2,0:bus-range: PCI bus number 0 out of range, expected (1 - 255)
>
> I could not find any reason why this is done in the first place, but
> this can be easily addressed by reassigning the two devices to
> bus 1, or by dropping the bus-range property in order to allow
> secondary bus 0 to be assigned.
>
> Assuming the bus-range is intentional, fix this by moving the
> devices to the first valid secondary bus number.
No, bus-range is not intentional. It should be removed instead.
>
> Fixes: 893faf67438c ("ARM: dts: BCM5301X: add root pcie bridges")
> Signed-off-by: Arnd Bergmann <arnd@arndb.de>
> ---
>  arch/arm/boot/dts/broadcom/bcm4709-netgear-r8000.dts | 4 ++--
>  1 file changed, 2 insertions(+), 2 deletions(-)
>
> diff --git a/arch/arm/boot/dts/broadcom/bcm4709-netgear-r8000.dts b/arch/arm/boot/dts/broadcom/bcm4709-netgear-r8000.dts
> index d170c71cbd76..355be5014943 100644
> --- a/arch/arm/boot/dts/broadcom/bcm4709-netgear-r8000.dts
> +++ b/arch/arm/boot/dts/broadcom/bcm4709-netgear-r8000.dts
> @@ -147,7 +147,7 @@ pcie@0,0 {
>
>                 pcie@1,0 {
>                         device_type = "pci";
> -                       reg = <0x800 0 0 0 0>;
> +                       reg = <0x10800 0 0 0 0>;
>
>                         #address-cells = <3>;
>                         #size-cells = <2>;
> @@ -162,7 +162,7 @@ wifi@0,0 {
>
>                 pcie@2,0 {
>                         device_type = "pci";
> -                       reg = <0x1000 0 0 0 0>;
> +                       reg = <0x11000 0 0 0 0>;
>
>                         #address-cells = <3>;
>                         #size-cells = <2>;
> --
> 2.39.5
>