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From: Nicolas Saenz Julienne <nsaenzjulienne@suse.de>
To: Rob Herring <robh+dt@kernel.org>,
	Nicolas Saenz Julienne <nsaenzjulienne@suse.de>,
	Florian Fainelli <f.fainelli@gmail.com>,
	Ray Jui <rjui@broadcom.com>,
	Scott Branden <sbranden@broadcom.com>,
	bcm-kernel-feedback-list@broadcom.com
Cc: devicetree@vger.kernel.org, linux-rpi-kernel@lists.infradead.org,
	linux-arm-kernel@lists.infradead.org,
	linux-kernel@vger.kernel.org
Subject: [PATCH] ARM: dts: bcm283x: Add cells encoding format to firmware bus
Date: Thu, 26 Mar 2020 14:44:13 +0100	[thread overview]
Message-ID: <20200326134413.12298-1-nsaenzjulienne@suse.de> (raw)

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>
---
 arch/arm/boot/dts/bcm2835-rpi.dtsi | 3 +++
 1 file changed, 3 insertions(+)

diff --git a/arch/arm/boot/dts/bcm2835-rpi.dtsi b/arch/arm/boot/dts/bcm2835-rpi.dtsi
index fd2c766e0f71..f7ae5a4530b8 100644
--- a/arch/arm/boot/dts/bcm2835-rpi.dtsi
+++ b/arch/arm/boot/dts/bcm2835-rpi.dtsi
@@ -14,6 +14,9 @@ act {
 	soc {
 		firmware: firmware {
 			compatible = "raspberrypi,bcm2835-firmware", "simple-bus";
+			#address-cells = <1>;
+			#size-cells = <1>;
+
 			mboxes = <&mailbox>;
 			dma-ranges;
 		};
-- 
2.25.1


             reply	other threads:[~2020-03-26 13:44 UTC|newest]

Thread overview: 4+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2020-03-26 13:44 Nicolas Saenz Julienne [this message]
2020-03-27 16:15 ` [PATCH] ARM: dts: bcm283x: Add cells encoding format to firmware bus Matthias Brugger
2020-03-27 16:17   ` Florian Fainelli
2020-03-27 16:48     ` Matthias Brugger

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