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
