linux-kernel - [PATCH v2 15/15] ARM: dts: bcm2711: add bcm2711-dma node

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Date: Wed, 13 Mar 2024 15:08:40 +0100
From: Andrea della Porta <andrea.porta@...e.com>
To: Vinod Koul <vkoul@...nel.org>,
	Rob Herring <robh+dt@...nel.org>,
	Krzysztof Kozlowski <krzysztof.kozlowski+dt@...aro.org>,
	Conor Dooley <conor+dt@...nel.org>,
	Florian Fainelli <florian.fainelli@...adcom.com>,
	Ray Jui <rjui@...adcom.com>,
	Scott Branden <sbranden@...adcom.com>,
	Broadcom internal kernel review list <bcm-kernel-feedback-list@...adcom.com>,
	Saenz Julienne <nsaenz@...nel.org>,
	dmaengine@...r.kernel.org,
	devicetree@...r.kernel.org,
	linux-rpi-kernel@...ts.infradead.org,
	linux-arm-kernel@...ts.infradead.org,
	linux-kernel@...r.kernel.org,
	dave.stevenson@...pberrypi.com
Cc: Phil Elwell <phil@...pberrypi.org>,
	Maxime Ripard <maxime@...no.tech>,
	Stefan Wahren <stefan.wahren@...e.com>,
	Dom Cobley <popcornmix@...il.com>,
	Andrea della Porta <andrea.porta@...e.com>
Subject: [PATCH v2 15/15] ARM: dts: bcm2711: add bcm2711-dma node

BCM2711 has 4 DMA channels with a 40-bit address range, allowing them
to access the full 4GB of memory on a Pi 4. Adding a new node to make
use of the DMA channels capable of 40 bit addressing.

Signed-off-by: Stefan Wahren <stefan.wahren@...e.com>
Signed-off-by: Andrea della Porta <andrea.porta@...e.com>
---
 arch/arm/boot/dts/broadcom/bcm2711.dtsi | 16 ++++++++++++++++
 1 file changed, 16 insertions(+)

diff --git a/arch/arm/boot/dts/broadcom/bcm2711.dtsi b/arch/arm/boot/dts/broadcom/bcm2711.dtsi
index 22c7f1561344..d98e3cf0c569 100644
--- a/arch/arm/boot/dts/broadcom/bcm2711.dtsi
+++ b/arch/arm/boot/dts/broadcom/bcm2711.dtsi
@@ -552,6 +552,22 @@ scb {
 		ranges = <0x0 0x7c000000  0x0 0xfc000000  0x03800000>,
 			 <0x6 0x00000000  0x6 0x00000000  0x40000000>;
 
+		dma40: dma-controller@...07b00 {
+			compatible = "brcm,bcm2711-dma";
+			reg = <0x0 0x7e007b00 0x400>;
+			interrupts = <GIC_SPI 89 IRQ_TYPE_LEVEL_HIGH>, /* dma4 11 */
+				     <GIC_SPI 90 IRQ_TYPE_LEVEL_HIGH>, /* dma4 12 */
+				     <GIC_SPI 91 IRQ_TYPE_LEVEL_HIGH>, /* dma4 13 */
+				     <GIC_SPI 92 IRQ_TYPE_LEVEL_HIGH>; /* dma4 14 */
+			interrupt-names = "dma11",
+					  "dma12",
+					  "dma13",
+					  "dma14";
+			#dma-cells = <1>;
+			/* The VPU firmware uses DMA channel 11 for VCHIQ */
+			brcm,dma-channel-mask = <0x7000>;
+		};
+
 		pcie0: pcie@...00000 {
 			compatible = "brcm,bcm2711-pcie";
 			reg = <0x0 0x7d500000 0x9310>;
-- 
2.35.3