From: Nicolas Saenz Julienne <nsaenzjulienne@suse.de>
Date: Thu, 19 Mar 2020 19:00:13 +0000 (+0100)
Subject: ARM: dts: bcm283x: Fix vc4's firmware bus DMA limitations
X-Git-Tag: accepted/tizen/unified/20200709.164653~570
X-Git-Url: http://review.tizen.org/git/?a=commitdiff_plain;h=6b36d37cffad87a518cb543282ac4d9e412521b8;p=platform%2Fkernel%2Flinux-rpi.git

ARM: dts: bcm283x: Fix vc4's firmware bus DMA limitations

The bus is virtual and devices have to inherit their DMA constraints
from the underlying interconnect. So add an empty dma-ranges property to
the bus node, implying the firmware bus' DMA constraints are identical to
its parent's.

Fixes: 7dbe8c62ceeb ("ARM: dts: Add minimal Raspberry Pi 4 support")
Signed-off-by: Nicolas Saenz Julienne <nsaenzjulienne@suse.de>
Signed-off-by: Florian Fainelli <f.fainelli@gmail.com>
---

diff --git a/arch/arm/boot/dts/bcm2835-rpi.dtsi b/arch/arm/boot/dts/bcm2835-rpi.dtsi
index 394c8a7..fd2c766e 100644
--- a/arch/arm/boot/dts/bcm2835-rpi.dtsi
+++ b/arch/arm/boot/dts/bcm2835-rpi.dtsi
@@ -15,6 +15,7 @@
 		firmware: firmware {
 			compatible = "raspberrypi,bcm2835-firmware", "simple-bus";
 			mboxes = <&mailbox>;
+			dma-ranges;
 		};
 
 		power: power {