This is a note to let you know that I've just added the patch titled ARM: dts: bcm283x: Add cells encoding format to firmware bus to the 5.6-stable tree which can be found at: http://www.kernel.org/git/?p=linux/kernel/git/stable/stable-queue.git;a=summary The filename of the patch is: arm-dts-bcm283x-add-cells-encoding-format-to-firmware-bus.patch and it can be found in the queue-5.6 subdirectory. If you, or anyone else, feels it should not be added to the stable tree, please let <stable@xxxxxxxxxxxxxxx> know about it. >From be08d278eb09210fefbad4c9b27d7843f1c096b2 Mon Sep 17 00:00:00 2001 From: Nicolas Saenz Julienne <nsaenzjulienne@xxxxxxx> Date: Thu, 26 Mar 2020 14:44:13 +0100 Subject: ARM: dts: bcm283x: Add cells encoding format to firmware bus From: Nicolas Saenz Julienne <nsaenzjulienne@xxxxxxx> 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@xxxxxxx> Link: https://lore.kernel.org/r/20200326134413.12298-1-nsaenzjulienne@xxxxxxx Signed-off-by: Greg Kroah-Hartman <gregkh@xxxxxxxxxxxxxxxxxxx> --- 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; }; Patches currently in stable-queue which might be from nsaenzjulienne@xxxxxxx are queue-5.6/arm-dts-bcm283x-add-cells-encoding-format-to-firmware-bus.patch