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This should include > - all of the per-channel registers. > -- interrupts: Should contain all of the per-channel DMA interrupts. > -- clocks: Must contain one entry, for the module clock. > - See ../clocks/clock-bindings.txt for details. > -- resets : Must contain an entry for each entry in reset-names. > - See ../reset/reset.txt for details. > -- reset-names : Must include the following entries: > - - dma > -- #dma-cells : Must be <1>. This dictates the length of DMA specifiers in > - client nodes' dmas properties. The specifier represents the DMA request > - select value for the peripheral. For more details, consult the Tegra TRM's > - documentation of the APB DMA channel control register REQ_SEL field. > - > -Examples: > - > -apbdma: dma@6000a000 { > - compatible = "nvidia,tegra20-apbdma"; > - reg = <0x6000a000 0x1200>; > - interrupts = < 0 136 0x04 > - 0 137 0x04 > - 0 138 0x04 > - 0 139 0x04 > - 0 140 0x04 > - 0 141 0x04 > - 0 142 0x04 > - 0 143 0x04 > - 0 144 0x04 > - 0 145 0x04 > - 0 146 0x04 > - 0 147 0x04 > - 0 148 0x04 > - 0 149 0x04 > - 0 150 0x04 > - 0 151 0x04 >; > - clocks = <&tegra_car 34>; > - resets = <&tegra_car 34>; > - reset-names = "dma"; > - #dma-cells = <1>; > -}; > diff --git a/Documentation/devicetree/bindings/dma/nvidia,tegra20-apbdma.yaml b/Documentation/devicetree/bindings/dma/nvidia,tegra20-apbdma.yaml > new file mode 100644 > index 0000000000000000000000000000000000000000..a2ffd5209b3bf3f2171b55351a557a6e2085987d > --- /dev/null > +++ b/Documentation/devicetree/bindings/dma/nvidia,tegra20-apbdma.yaml > @@ -0,0 +1,90 @@ > +# SPDX-License-Identifier: (GPL-2.0-only OR BSD-2-Clause) > +%YAML 1.2 > +--- > +$id: http://devicetree.org/schemas/dma/nvidia,tegra20-apbdma.yaml# > +$schema: http://devicetree.org/meta-schemas/core.yaml# > + > +title: NVIDIA Tegra APB DMA Controller > + > +description: > + The NVIDIA Tegra APB DMA controller is a hardware component that > + enables direct memory access (DMA) on Tegra systems. It facilitates > + data transfer between I/O devices and main memory without constant > + CPU intervention. > + > +maintainers: > + - Jonathan Hunter > + > +properties: > + compatible: > + oneOf: > + - const: nvidia,tegra20-apbdma > + - items: > + - const: nvidia,tegra30-apbdma > + - const: nvidia,tegra20-apbdma > + > + reg: > + maxItems: 1 > + > + "#dma-cells": > + const: 1 > + > + clocks: > + maxItems: 1 > + > + interrupts: > + description: > + Should contain all of the per-channel DMA interrupts in > + ascending order with respect to the DMA channel index. > + minItems: 1 > + maxItems: 32 > + > + resets: > + maxItems: 1 > + > + reset-names: > + const: dma Krzysztof, given that there is only 1, isn't the preference to remove this? I understand that this requires a driver change, but it should not break compatibility. Jon -- nvpublic