linux-kernel - [PATCH v2 03/14] arm64: dts: mediatek: mt7622: add support for coherent DMA

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Date:   Tue,  5 Apr 2022 21:57:44 +0200
From:   Felix Fietkau <nbd@....name>
To:     netdev@...r.kernel.org, Rob Herring <robh+dt@...nel.org>,
        Krzysztof Kozlowski <krzk+dt@...nel.org>,
        Matthias Brugger <matthias.bgg@...il.com>
Cc:     devicetree@...r.kernel.org, linux-arm-kernel@...ts.infradead.org,
        linux-mediatek@...ts.infradead.org, linux-kernel@...r.kernel.org
Subject: [PATCH v2 03/14] arm64: dts: mediatek: mt7622: add support for coherent DMA

It improves performance by eliminating the need for a cache flush on rx and tx

Signed-off-by: Felix Fietkau <nbd@....name>
---
 arch/arm64/boot/dts/mediatek/mt7622.dtsi | 4 +++-
 1 file changed, 3 insertions(+), 1 deletion(-)

diff --git a/arch/arm64/boot/dts/mediatek/mt7622.dtsi b/arch/arm64/boot/dts/mediatek/mt7622.dtsi
index 6f8cb3ad1e84..a2257ec6d256 100644
--- a/arch/arm64/boot/dts/mediatek/mt7622.dtsi
+++ b/arch/arm64/boot/dts/mediatek/mt7622.dtsi
@@ -357,7 +357,7 @@ cci_control1: slave-if@...0 {
 		};
 
 		cci_control2: slave-if@...0 {
-			compatible = "arm,cci-400-ctrl-if";
+			compatible = "arm,cci-400-ctrl-if", "syscon";
 			interface-type = "ace";
 			reg = <0x5000 0x1000>;
 		};
@@ -945,6 +945,8 @@ eth: ethernet@...00000 {
 		power-domains = <&scpsys MT7622_POWER_DOMAIN_ETHSYS>;
 		mediatek,ethsys = <&ethsys>;
 		mediatek,sgmiisys = <&sgmiisys>;
+		mediatek,cci-control = <&cci_control2>;
+		dma-coherent;
 		#address-cells = <1>;
 		#size-cells = <0>;
 		status = "disabled";
-- 
2.35.1