From: Nicolas Saenz Julienne nsaenzjulienne@suse.de
commit be08d278eb09210fefbad4c9b27d7843f1c096b2 upstream.
With the introduction of 55c7c0621078 ("ARM: dts: bcm283x: Fix vc4's firmware bus DMA limitations") the firmware bus has to comply with /soc's DMA limitations. Ultimately linking both buses to a same dma-ranges property. The patch (and author) missed the fact that a bus' #address-cells and #size-cells properties are not inherited, but set to a fixed value which, in this case, doesn't match /soc's. This, although not breaking Linux's DMA mapping functionality, generates ugly dtc warnings.
Fix the issue by adding the correct address and size cells properties under the firmware bus.
Fixes: 55c7c0621078 ("ARM: dts: bcm283x: Fix vc4's firmware bus DMA limitations") Signed-off-by: Nicolas Saenz Julienne nsaenzjulienne@suse.de Link: https://lore.kernel.org/r/20200326134413.12298-1-nsaenzjulienne@suse.de Signed-off-by: Greg Kroah-Hartman gregkh@linuxfoundation.org
--- arch/arm/boot/dts/bcm2835-rpi.dtsi | 3 +++ 1 file changed, 3 insertions(+)
--- a/arch/arm/boot/dts/bcm2835-rpi.dtsi +++ b/arch/arm/boot/dts/bcm2835-rpi.dtsi @@ -14,6 +14,9 @@ soc { firmware: firmware { compatible = "raspberrypi,bcm2835-firmware", "simple-bus"; + #address-cells = <1>; + #size-cells = <1>; + mboxes = <&mailbox>; dma-ranges; };