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@xxxxxxxx>
---
arch/arm/boot/dts/bcm2711.dtsi | 16 ++++++++++++++++
1 file changed, 16 insertions(+)
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>;
+ };
};
};
--
2.7.4
