dt-bindings: dma: nvidia,tegra20-apbdma: convert text based binding to json schema

Update text binding to YAML.
Changes during conversion:
- Add a fallback for "nvidia,tegra30-apbdma" as it is
  compatible with the IP core on "nvidia,tegra20-apbdma".
- Update examples and include appropriate file directives to resolve
  errors identified by `dt_binding_check` and `dtbs_check`.

Signed-off-by: Charan Pedumuru <charan.pedumuru@gmail.com>
Reviewed-by: Krzysztof Kozlowski <krzysztof.kozlowski@linaro.org>
Link: https://lore.kernel.org/r/20250507-nvidea-dma-v4-2-6161a8de376f@gmail.com
Signed-off-by: Thierry Reding <treding@nvidia.com>

diff --git a/Documentation/devicetree/bindings/dma/nvidia,tegra20-apbdma.txt b/Documentation/devicetree/bindings/dma/nvidia,tegra20-apbdma.txt
deleted file mode 100644 (file)
index 447fb44..0000000
--- a/Documentation/devicetree/bindings/dma/nvidia,tegra20-apbdma.txt
+++ /dev/null
@@ -1,44 +0,0 @@
-* NVIDIA Tegra APB DMA controller
-
-Required properties:
-- compatible: Should be "nvidia,<chip>-apbdma"
-- reg: Should contain DMA registers location and length. 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 (file)
index 0000000..a2ffd52
--- /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 <jonathanh@nvidia.com>
+
+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
+
+required:
+  - compatible
+  - reg
+  - "#dma-cells"
+  - clocks
+  - interrupts
+  - resets
+  - reset-names
+
+allOf:
+  - $ref: dma-controller.yaml#
+
+unevaluatedProperties: false
+
+examples:
+  - |
+    #include <dt-bindings/interrupt-controller/arm-gic.h>
+    #include <dt-bindings/reset/tegra186-reset.h>
+    dma-controller@6000a000 {
+        compatible = "nvidia,tegra30-apbdma", "nvidia,tegra20-apbdma";
+        reg = <0x6000a000 0x1200>;
+        interrupts = <GIC_SPI 136 IRQ_TYPE_LEVEL_HIGH>,
+                     <GIC_SPI 137 IRQ_TYPE_LEVEL_HIGH>,
+                     <GIC_SPI 138 IRQ_TYPE_LEVEL_HIGH>,
+                     <GIC_SPI 139 IRQ_TYPE_LEVEL_HIGH>,
+                     <GIC_SPI 140 IRQ_TYPE_LEVEL_HIGH>,
+                     <GIC_SPI 141 IRQ_TYPE_LEVEL_HIGH>,
+                     <GIC_SPI 142 IRQ_TYPE_LEVEL_HIGH>,
+                     <GIC_SPI 143 IRQ_TYPE_LEVEL_HIGH>,
+                     <GIC_SPI 144 IRQ_TYPE_LEVEL_HIGH>,
+                     <GIC_SPI 145 IRQ_TYPE_LEVEL_HIGH>,
+                     <GIC_SPI 146 IRQ_TYPE_LEVEL_HIGH>,
+                     <GIC_SPI 147 IRQ_TYPE_LEVEL_HIGH>,
+                     <GIC_SPI 148 IRQ_TYPE_LEVEL_HIGH>,
+                     <GIC_SPI 149 IRQ_TYPE_LEVEL_HIGH>,
+                     <GIC_SPI 150 IRQ_TYPE_LEVEL_HIGH>,
+                     <GIC_SPI 151 IRQ_TYPE_LEVEL_HIGH>;
+        clocks = <&tegra_car 34>;
+        resets = <&tegra_car 34>;
+        reset-names = "dma";
+        #dma-cells = <1>;
+    };
+...