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 {