On Mon, Nov 22, 2021 at 02:58:09PM +0530, Akhil R wrote:

quoted

Add DT binding document for Nvidia Tegra GPCDMA controller.

Signed-off-by: Rajesh Gumasta <redacted>
Signed-off-by: Akhil R <akhilrajeev@nvidia.com>
Reviewed-by: Jon Hunter <jonathanh@nvidia.com>
---
 .../bindings/dma/nvidia,tegra186-gpc-dma.yaml      | 111

+++++++++++++++++++++

quoted

 1 file changed, 111 insertions(+)
 create mode 100644
Documentation/devicetree/bindings/dma/nvidia,tegra186-gpc-dma.yaml

diff --git
a/Documentation/devicetree/bindings/dma/nvidia,tegra186-gpc-dma.yaml
b/Documentation/devicetree/bindings/dma/nvidia,tegra186-gpc-dma.yaml
new file mode 100644
index 0000000..3a5a70d

--- /dev/null
+++ b/Documentation/devicetree/bindings/dma/nvidia,tegra186-gpc-dma.ya
+++ ml

@@ -0,0 +1,111 @@
+# SPDX-License-Identifier: (GPL-2.0-only OR BSD-2-Clause) %YAML 1.2
+---
+$id: http://devicetree.org/schemas/dma/nvidia,tegra186-gpc-dma.yaml#
+$schema: http://devicetree.org/meta-schemas/core.yaml#
+
+title: NVIDIA Tegra GPC DMA Controller Device Tree Bindings
+
+description: |
+  The Tegra General Purpose Central (GPC) DMA controller is used for
+faster
+  data transfers between memory to memory, memory to device and
+device to
+  memory.
+
+maintainers:
+  - Jon Hunter <jonathanh@nvidia.com>
+  - Rajesh Gumasta <rgumasta@nvidia.com>
+
+allOf:
+  - $ref: "dma-controller.yaml#"
+
+properties:
+  compatible:
+    oneOf:
+      - const: nvidia,tegra186-gpcdma
+      - items:
+         - const: nvidia,tegra186-gpcdma
+         - const: nvidia,tegra194-gpcdma

Still not how 'compatible' works nor what I wrote out for you.

I thought '186' and '194' got interchanged in your previous comment because it is 194
which is the superset of 186 and have got more features than 186.
Or probably I did not understand the idea correctly yet.