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@xxxxxxxx>
Signed-off-by: Andrea della Porta <andrea.porta@xxxxxxxx>
---
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@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>;
+ };
+
pcie0: pcie@7d500000 {
compatible = "brcm,bcm2711-pcie";
reg = <0x0 0x7d500000 0x9310>;
--
2.35.3
