dt-bindings: Add devicetree bindings

Add snapshot of device tree bindings from keystone common kernel, branch
"android-mainline-keystone-qcom-release" at c4c12103f9c0 ("Snap for 9228065
from e32903b9a63bb558df8b803b076619c53c16baad to
android-mainline-keystone-qcom-release").

Change-Id: I7682079615cbd9f29340a5c1f2a1d84ec441a1f1
Signed-off-by: Melody Olvera <quic_molvera@quicinc.com>

bindings/dma/nvidia,tegra20-apbdma.txt

@@ -0,0 +1,44 @@
+* NVIDIA Tegra APB DMA controller
+
+Required properties:
+- compatible: Should be "nvidia,<chip>-apbdma"
+- reg: Should contain DMA registers location and length. This shuld 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>;
+};