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[RFC,11/11] ARM: dts: bcm2711: add bcm2711-dma node

Message ID 1640606812-11110-2-git-send-email-stefan.wahren@i2se.com (mailing list archive)
State Changes Requested
Headers show
Series dmaengine: bcm2835: add BCM2711 40-bit DMA support | expand

Commit Message

Stefan Wahren Dec. 27, 2021, 12:06 p.m. UTC 
BCM2711 has 4 DMA channels with a 40-bit address range, allowing them
to access the full 4GB of memory on a Pi 4. Not sure which adjustments to
the parent node (scb) are required.

Signed-off-by: Stefan Wahren <stefan.wahren@i2se.com>
---
 arch/arm/boot/dts/bcm2711.dtsi | 16 ++++++++++++++++
 1 file changed, 16 insertions(+)
diff mbox series

Patch

diff --git a/arch/arm/boot/dts/bcm2711.dtsi b/arch/arm/boot/dts/bcm2711.dtsi
index 590068b..12f373b 100644
--- a/arch/arm/boot/dts/bcm2711.dtsi
+++ b/arch/arm/boot/dts/bcm2711.dtsi
@@ -536,6 +536,22 @@ 
 				#size-cells = <0x1>;
 			};
 		};
+
+		dma40: dma-controller@7e007b00 {
+			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>;
+		};
 	};
 };