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dt-bindings: bus: Add binding for the Allwinner MBUS controller

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The MBUS controller drives the MBUS that other devices in the SoC will
use to perform DMA. It also has a register interface that allows to
monitor and control the bandwidth and priorities for masters on that
bus.

Signed-off-by: Maxime Ripard <maxime.ripard@bootlin.com>
Signed-off-by: Rob Herring <robh@kernel.org>
This commit is contained in:
Maxime Ripard 2019-04-01 10:56:42 +02:00 committed by Rob Herring
parent c43a446940
commit e5ffa40c03
1 changed files with 36 additions and 0 deletions
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Documentation/devicetree/bindings/arm/sunxi/sunxi-mbus.txt Normal file
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Allwinner Memory Bus (MBUS) controller
The MBUS controller drives the MBUS that other devices in the SoC will
use to perform DMA. It also has a register interface that allows to
monitor and control the bandwidth and priorities for masters on that
bus.
Required properties:
- compatible: Must be one of:
- allwinner,sun5i-a13-mbus
- reg: Offset and length of the register set for the controller
- clocks: phandle to the clock driving the controller
- dma-ranges: See section 2.3.9 of the DeviceTree Specification
- #interconnect-cells: Must be one, with the argument being the MBUS
port ID
Each device having to perform their DMA through the MBUS must have the
interconnects and interconnect-names properties set to the MBUS
controller and with "dma-mem" as the interconnect name.
Example:
mbus: dram-controller@1c01000 {
compatible = "allwinner,sun5i-a13-mbus";
reg = <0x01c01000 0x1000>;
clocks = <&ccu CLK_MBUS>;
dma-ranges = <0x00000000 0x40000000 0x20000000>;
#interconnect-cells = <1>;
};
fe0: display-frontend@1e00000 {
compatible = "allwinner,sun5i-a13-display-frontend";
...
interconnects = <&mbus 19>;
interconnect-names = "dma-mem";
};