[PATCH RFC 11/11] ARM: dts: bcm2711: add bcm2711-dma node
From: Stefan Wahren <hidden>
Date: 2021-12-27 12:07:19
Also in:
dmaengine, linux-devicetree
Subsystem:
the rest · Maintainer:
Linus Torvalds
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 <redacted> --- 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
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