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| -rw-r--r-- | Documentation/devicetree/bindings/arm/sunxi/allwinner,sun4i-a10-mbus.yaml | 65 |
1 files changed, 65 insertions, 0 deletions
diff --git a/Documentation/devicetree/bindings/arm/sunxi/allwinner,sun4i-a10-mbus.yaml b/Documentation/devicetree/bindings/arm/sunxi/allwinner,sun4i-a10-mbus.yaml new file mode 100644 index 000000000000..9370e64992dd --- /dev/null +++ b/Documentation/devicetree/bindings/arm/sunxi/allwinner,sun4i-a10-mbus.yaml @@ -0,0 +1,65 @@ +# SPDX-License-Identifier: GPL-2.0 +%YAML 1.2 +--- +$id: http://devicetree.org/schemas/arm/sunxi/allwinner,sun4i-a10-mbus.yaml# +$schema: http://devicetree.org/meta-schemas/core.yaml# + +title: Allwinner Memory Bus (MBUS) controller + +maintainers: + - Chen-Yu Tsai <wens@csie.org> + - Maxime Ripard <mripard@kernel.org> + +description: | + 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. + + 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. + +properties: + "#interconnect-cells": + const: 1 + description: + The content of the cell is the MBUS ID. + + compatible: + enum: + - allwinner,sun5i-a13-mbus + - allwinner,sun8i-h3-mbus + + reg: + maxItems: 1 + + clocks: + maxItems: 1 + + dma-ranges: + description: + See section 2.3.9 of the DeviceTree Specification. + +required: + - "#interconnect-cells" + - compatible + - reg + - clocks + - dma-ranges + +additionalProperties: false + +examples: + - | + #include <dt-bindings/clock/sun5i-ccu.h> + + mbus: dram-controller@1c01000 { + compatible = "allwinner,sun5i-a13-mbus"; + reg = <0x01c01000 0x1000>; + clocks = <&ccu CLK_MBUS>; + dma-ranges = <0x00000000 0x40000000 0x20000000>; + #interconnect-cells = <1>; + }; + +... |