When compiling the device tree for the Integrator/AP with IM-PD1, the following warning is observed regarding the display controller node:
arch/arm/boot/dts/arm/integratorap-im-pd1.dts:251.3-14: Warning (dma_ranges_format): /bus@c0000000/bus@c0000000/display@1000000:dma-ranges: empty "dma-ranges" property but its #address-cells (2) differs from /bus@c0000000/bus@c0000000 (1)
The display node specifies an empty "dma-ranges" property, intended to describe a 1:1 identity mapping. However, the node lacks explicit "#address-cells" and "#size-cells" properties. In this case, the device tree compiler defaults the address cells to 2 (64-bit), which conflicts with the parent bus configuration (32-bit, 1 cell).
Fix this by explicitly defining "#address-cells" and "#size-cells" as 1. This matches the 32-bit architecture of the Integrator platform and ensures the address translation range is correctly parsed by the compiler.
Fixes: 7bea67a99430 ("ARM: dts: integrator: Fix DMA ranges") Cc: stable@vger.kernel.org Signed-off-by: Kuan-Wei Chiu visitorckw@gmail.com --- arch/arm/boot/dts/arm/integratorap-im-pd1.dts | 2 ++ 1 file changed, 2 insertions(+)
diff --git a/arch/arm/boot/dts/arm/integratorap-im-pd1.dts b/arch/arm/boot/dts/arm/integratorap-im-pd1.dts index db13e09f2fab..6d90d9a42dc9 100644 --- a/arch/arm/boot/dts/arm/integratorap-im-pd1.dts +++ b/arch/arm/boot/dts/arm/integratorap-im-pd1.dts @@ -248,6 +248,8 @@ display@1000000 { /* 640x480 16bpp @ 25.175MHz is 36827428 bytes/s */ max-memory-bandwidth = <40000000>; memory-region = <&impd1_ram>; + #address-cells = <1>; + #size-cells = <1>; dma-ranges;
port@0 {
On Thu, Dec 4, 2025 at 5:42 PM Kuan-Wei Chiu visitorckw@gmail.com wrote:
When compiling the device tree for the Integrator/AP with IM-PD1, the following warning is observed regarding the display controller node:
arch/arm/boot/dts/arm/integratorap-im-pd1.dts:251.3-14: Warning (dma_ranges_format): /bus@c0000000/bus@c0000000/display@1000000:dma-ranges: empty "dma-ranges" property but its #address-cells (2) differs from /bus@c0000000/bus@c0000000 (1)
The display node specifies an empty "dma-ranges" property, intended to describe a 1:1 identity mapping. However, the node lacks explicit "#address-cells" and "#size-cells" properties.
(...)
+++ b/arch/arm/boot/dts/arm/integratorap-im-pd1.dts @@ -248,6 +248,8 @@ display@1000000 { /* 640x480 16bpp @ 25.175MHz is 36827428 bytes/s */ max-memory-bandwidth = <40000000>; memory-region = <&impd1_ram>;
#address-cells = <1>;#size-cells = <1>; dma-ranges; port@0 {
This is for the *port* node and not for the stuff mentioned in the commit message, but the port is:
port@0 { #address-cells = <1>; #size-cells = <0>;
clcd_pads_vga_dac: endpoint@0 { reg = <0>; remote-endpoint = <&vga_bridge_in>; arm,pl11x,tft-r0g0b0-pads = <0 8 16>; }; };
Devoid of any reg, so who cares?
Probably the empty dma-ranges should just be deleted again, it is pointless for the port.
Yours, Linus Walleij
On Thu, 04 Dec 2025 16:42:28 +0000, Kuan-Wei Chiu wrote:
When compiling the device tree for the Integrator/AP with IM-PD1, the following warning is observed regarding the display controller node:
arch/arm/boot/dts/arm/integratorap-im-pd1.dts:251.3-14: Warning (dma_ranges_format): /bus@c0000000/bus@c0000000/display@1000000:dma-ranges: empty "dma-ranges" property but its #address-cells (2) differs from /bus@c0000000/bus@c0000000 (1)
The display node specifies an empty "dma-ranges" property, intended to describe a 1:1 identity mapping. However, the node lacks explicit "#address-cells" and "#size-cells" properties. In this case, the device tree compiler defaults the address cells to 2 (64-bit), which conflicts with the parent bus configuration (32-bit, 1 cell).
Fix this by explicitly defining "#address-cells" and "#size-cells" as
- This matches the 32-bit architecture of the Integrator platform and
ensures the address translation range is correctly parsed by the compiler.
Fixes: 7bea67a99430 ("ARM: dts: integrator: Fix DMA ranges") Cc: stable@vger.kernel.org Signed-off-by: Kuan-Wei Chiu visitorckw@gmail.com
arch/arm/boot/dts/arm/integratorap-im-pd1.dts | 2 ++ 1 file changed, 2 insertions(+)
My bot found new DTB warnings on the .dts files added or changed in this series.
Some warnings may be from an existing SoC .dtsi. Or perhaps the warnings are fixed by another series. Ultimately, it is up to the platform maintainer whether these warnings are acceptable or not. No need to reply unless the platform maintainer has comments.
If you already ran DT checks and didn't see these error(s), then make sure dt-schema is up to date:
pip3 install dtschema --upgrade
This patch series was applied (using b4) to base: Base: attempting to guess base-commit... Base: tags/v6.18-rc6-2004-g29bce9c8b41d (exact match) Base: tags/v6.18-rc6-2004-g29bce9c8b41d (use --merge-base to override)
If this is not the correct base, please add 'base-commit' tag (or use b4 which does this automatically)
New warnings running 'make CHECK_DTBS=y for arch/arm/boot/dts/arm/' for 20251204164228.113587-1-visitorckw@gmail.com:
arch/arm/boot/dts/arm/integratorap-im-pd1.dtb: display@1000000 (arm,pl110): '#address-cells', '#size-cells', 'dma-ranges', 'port@0' do not match any of the regexes: '^pinctrl-[0-9]+$' from schema $id: http://devicetree.org/schemas/display/arm,pl11x.yaml
linux-stable-mirror@lists.linaro.org
-
Kuan-Wei Chiu -
Linus Walleij -
Rob Herring